From b753f169ba0f56e4a04ae1e224bb8f44222d01d5 Mon Sep 17 00:00:00 2001
From: stebogit <stefano.borghi@gmail.com>
Date: Thu, 17 Aug 2017 01:06:56 -0700
Subject: [PATCH 01/12] additional refactoring of turf-concave: - replaced
 turf-union with geojson-dissolve; - updated and added tests; - updated bench
 and readme;

---
 packages/turf-concave/README.md               |   2 +-
 packages/turf-concave/bench.js                |  16 +-
 packages/turf-concave/index.js                |  55 ++--
 packages/turf-concave/package.json            |  16 +-
 packages/turf-concave/test.js                 |   7 +-
 packages/turf-concave/test/in/fiji.geojson    | 152 ++++++++++++
 packages/turf-concave/test/in/pts3.geojson    |  86 +++++++
 packages/turf-concave/test/out/fiji.geojson   | 234 ++++++++++++++++++
 .../turf-concave/test/out/issue-333.geojson   |  92 +++----
 packages/turf-concave/test/out/pts1.geojson   |  16 +-
 packages/turf-concave/test/out/pts2.geojson   |  30 +--
 packages/turf-concave/test/out/pts3.geojson   | 130 ++++++++++
 packages/turf-concave/yarn.lock               |  84 +++++--
 13 files changed, 788 insertions(+), 132 deletions(-)
 create mode 100644 packages/turf-concave/test/in/fiji.geojson
 create mode 100644 packages/turf-concave/test/in/pts3.geojson
 create mode 100644 packages/turf-concave/test/out/fiji.geojson
 create mode 100644 packages/turf-concave/test/out/pts3.geojson

diff --git a/packages/turf-concave/README.md b/packages/turf-concave/README.md
index 4ead6bf9f0..802bb1deb4 100644
--- a/packages/turf-concave/README.md
+++ b/packages/turf-concave/README.md
@@ -31,7 +31,7 @@ var addToMap = [points, hull]
 
 -   Throws **[Error](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error)** if maxEdge parameter is missing or unable to compute hull
 
-Returns **[Feature](http://geojson.org/geojson-spec.html#feature-objects)&lt;[Polygon](http://geojson.org/geojson-spec.html#polygon)>** a concave hull
+Returns **[Feature](http://geojson.org/geojson-spec.html#feature-objects)&lt;[Polygon](http://geojson.org/geojson-spec.html#polygon)|[MultiPolygon](http://geojson.org/geojson-spec.html#multipolygon)>** a concave hull
 
 <!-- This file is automatically generated. Please don't edit it directly:
 if you find an error, edit the source file (likely index.js), and re-run
diff --git a/packages/turf-concave/bench.js b/packages/turf-concave/bench.js
index d393669ba1..2362106334 100644
--- a/packages/turf-concave/bench.js
+++ b/packages/turf-concave/bench.js
@@ -15,9 +15,11 @@ const fixtures = fs.readdirSync(directory).map(filename => {
 /**
  * Single Process Benchmark
  *
- * issue-333: 651.884ms
- * pts1: 6.568ms
- * pts2: 476.032ms
+ * fiji: 17.973ms
+ * issue-333: 31.418ms
+ * pts1: 1.207ms
+ * pts2: 17.366ms
+ * pts3: 0.853ms
  */
 for (const {name, geojson} of fixtures) {
     const {maxEdge, units} = geojson.properties || {maxEdge: 1};
@@ -29,9 +31,11 @@ for (const {name, geojson} of fixtures) {
 /**
  * Benchmark Results
  *
- * issue-333 x 5.57 ops/sec ±10.65% (18 runs sampled)
- * pts1 x 315 ops/sec ±3.48% (70 runs sampled)
- * pts2 x 4.51 ops/sec ±2.28% (16 runs sampled)
+ * fiji x 1,513 ops/sec ±10.80% (63 runs sampled)
+ * issue-333 x 183 ops/sec ±2.41% (74 runs sampled)
+ * pts1 x 2,934 ops/sec ±2.35% (78 runs sampled)
+ * pts2 x 136 ops/sec ±3.87% (67 runs sampled)
+ * pts3 x 7,215 ops/sec ±9.04% (70 runs sampled)
  */
 const suite = new Benchmark.Suite('turf-transform-scale');
 for (const {name, geojson} of fixtures) {
diff --git a/packages/turf-concave/index.js b/packages/turf-concave/index.js
index 22fc419128..4391d921a2 100644
--- a/packages/turf-concave/index.js
+++ b/packages/turf-concave/index.js
@@ -1,15 +1,12 @@
-// 1. run tin on points
-// 2. calculate length of all edges and area of all triangles
-// 3. remove triangles that fail the max length test
-// 4. buffer the results slightly
-// 5. merge the results
 var tin = require('@turf/tin');
-var union = require('@turf/union');
+var helpers = require('@turf/helpers');
 var distance = require('@turf/distance');
-var clone = require('@turf/clone');
+var dissolve = require('geojson-dissolve');
+var feature = helpers.feature;
+var featureCollection = helpers.featureCollection;
 
 /**
- * Takes a set of {@link Point|points} and returns a concave hull polygon.
+ * Takes a set of {@link Point|points} and returns a concave hull Polygon or MultiPolygon.
  * Internally, this uses [turf-tin](https://github.com/Turfjs/turf-tin) to generate geometries.
  *
  * @param {FeatureCollection<Point>} points input points
@@ -33,11 +30,16 @@ var clone = require('@turf/clone');
  * var addToMap = [points, hull]
  */
 module.exports = function (points, maxEdge, units) {
+    // validation
     if (!points) throw new Error('points is required');
     if (maxEdge === undefined || maxEdge === null) throw new Error('maxEdge is required');
     if (typeof maxEdge !== 'number') throw new Error('invalid maxEdge');
 
-    var tinPolys = tin(points);
+    var cleaned = removeDuplicates(points);
+
+    var tinPolys = tin(cleaned);
+    // calculate length of all edges and area of all triangles
+    // and remove triangles that fail the max length test
     tinPolys.features = tinPolys.features.filter(function (triangle) {
         var pt1 = triangle.geometry.coordinates[0][0];
         var pt2 = triangle.geometry.coordinates[0][1];
@@ -50,23 +52,32 @@ module.exports = function (points, maxEdge, units) {
 
     if (tinPolys.features.length < 1) throw new Error('too few polygons found to compute concave hull');
 
-    return merge(tinPolys.features);
+    // merge the adjacent triangles
+    var dissolved = dissolve(tinPolys.features);
+    // geojson-dissolve always returns a MultiPolygon
+    if (dissolved.coordinates.length === 1) {
+        dissolved.coordinates = dissolved.coordinates[0];
+        dissolved.type = 'Polygon';
+    }
+    return feature(dissolved);
 };
 
 /**
- * Merges/Unifies all the features in a single polygon
+ * Removes duplicated points in a collection returning a new collection
  *
  * @private
- * @param {Array<Feature>} features to be merged
- * @returns {Feature<(Polygon|MultiPolygon)>} merged result
+ * @param {FeatureCollection<Point>} points to be cleaned
+ * @returns {FeatureCollection<Point>} cleaned set of points
  */
-function merge(features) {
-    var merged = clone(features[0]);
-    merged.properties = {};
-
-    for (var i = 0, len = features.length; i < len; i++) {
-        var poly = features[i];
-        if (poly.geometry) merged = union(merged, poly);
-    }
-    return merged;
+function removeDuplicates(points) {
+    var cleaned = [];
+    var existing = {};
+    points.features.forEach(function (pt) {
+        var key = pt.geometry.coordinates.join('-');
+        if (!existing.hasOwnProperty(key)) {
+            cleaned.push(pt);
+            existing[key] = true;
+        }
+    });
+    return featureCollection(cleaned, points.properties);
 }
diff --git a/packages/turf-concave/package.json b/packages/turf-concave/package.json
index 3e463e150b..a60aa7e1ed 100644
--- a/packages/turf-concave/package.json
+++ b/packages/turf-concave/package.json
@@ -24,7 +24,12 @@
   ],
   "author": "Turf Authors",
   "contributors": [
-    "Stefano Borghi <@stebogit>"
+    "Tom MacWright <@tmcw>",
+    "Lyzi Diamond <@lyzidiamond>",
+    "Denis Carriere <@DenisCarriere>",
+    "Stefano Borghi <@stebogit>",
+    "Rowan Winsemius <@rowanwins>",
+    "Daniel Pulido <@dpmcmlxxvi>"
   ],
   "license": "MIT",
   "bugs": {
@@ -32,7 +37,6 @@
   },
   "homepage": "https://github.com/Turfjs/turf",
   "devDependencies": {
-    "@turf/helpers": "^4.6.0",
     "@turf/meta": "^4.6.0",
     "benchmark": "^2.1.4",
     "load-json-file": "^2.0.0",
@@ -40,9 +44,9 @@
     "write-json-file": "^2.1.4"
   },
   "dependencies": {
-    "@turf/distance": "^4.6.0",
-    "@turf/tin": "^4.6.0",
-    "@turf/union": "^4.6.0",
-    "@turf/clone": "^4.6.0"
+    "@turf/distance": "4.6.0",
+    "@turf/helpers": "^4.6.0",
+    "@turf/tin": "4.6.0",
+    "geojson-dissolve": "3.1.0"
   }
 }
diff --git a/packages/turf-concave/test.js b/packages/turf-concave/test.js
index cd8f1a169f..78249047c4 100644
--- a/packages/turf-concave/test.js
+++ b/packages/turf-concave/test.js
@@ -20,9 +20,10 @@ const fixtures = fs.readdirSync(directories.in).map(filename => {
     };
 });
 
-test('turf-line-split', t => {
+test('turf-concave', t => {
     for(const {filename, name, geojson}  of fixtures) {
-        const {maxEdge, units} = geojson.properties || {maxEdge: 1};
+        let {maxEdge, units} = geojson.properties;
+        maxEdge = maxEdge || 1;
         const hull = concave(geojson, maxEdge, units);
         featureEach(geojson, stylePt);
         const results = featureCollection([...geojson.features, hull]);
@@ -37,7 +38,7 @@ test('turf-line-split', t => {
 const points = featureCollection([point([0, 0]), point([1, 1]), point([1, 0])]);
 const onePoint = featureCollection([point([0, 0])]);
 
-test('concave', t => {
+test('concave -- throw', t => {
     t.throws(() => concave(onePoint, 5.5, 'miles'), /too few polygons found to compute concave hull/, 'too few points');
     t.throws(() => concave(onePoint, 0), /too few polygons found to compute concave hull/, 'maxEdge too small');
 
diff --git a/packages/turf-concave/test/in/fiji.geojson b/packages/turf-concave/test/in/fiji.geojson
new file mode 100644
index 0000000000..bbf1824724
--- /dev/null
+++ b/packages/turf-concave/test/in/fiji.geojson
@@ -0,0 +1,152 @@
+{
+	"type": "FeatureCollection",
+	"properties": {
+		"maxEdge": 20,
+		"units": "miles"
+	},
+	"features": [
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-179.6484375,
+					-16.90442787825499
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-179.62921142578125,
+					-16.675662043309767
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-179.95330810546875,
+					-16.830832189624815
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-179.85443115234375,
+					-16.675662043309767
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-180.20050048828125,
+					-16.97274101999901
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-180.142822265625,
+					-16.825574258731486
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-180.0823974609375,
+					-17.069913009885465
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-180.4833984375,
+					-17.295576394503744
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-179.8187255859375,
+					-16.893915964126325
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-180.01922607421875,
+					-16.759837823776632
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-179.76791381835938,
+					-16.784820349855963
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-180.01510620117188,
+					-16.914939206301646
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-179.92721557617188,
+					-16.942528651601
+				]
+			}
+		}
+	]
+}
\ No newline at end of file
diff --git a/packages/turf-concave/test/in/pts3.geojson b/packages/turf-concave/test/in/pts3.geojson
new file mode 100644
index 0000000000..044bccd8e1
--- /dev/null
+++ b/packages/turf-concave/test/in/pts3.geojson
@@ -0,0 +1,86 @@
+{
+	"type": "FeatureCollection",
+	"properties": {
+		"maxEdge": 2,
+		"units": "miles"
+	},
+	"features": [
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.40898132324217,
+					37.77505678240509
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.41859436035156,
+					37.729724141962045
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.42786407470703,
+					37.738141282210385
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.43198394775389,
+					37.72836644908416
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.47592926025389,
+					37.78645343442073
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.41687774658202,
+					37.76555823017286
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.42820739746094,
+					37.91115885137137
+				]
+			}
+		}
+	]
+}
\ No newline at end of file
diff --git a/packages/turf-concave/test/out/fiji.geojson b/packages/turf-concave/test/out/fiji.geojson
new file mode 100644
index 0000000000..6c72131d46
--- /dev/null
+++ b/packages/turf-concave/test/out/fiji.geojson
@@ -0,0 +1,234 @@
+{
+	"type": "FeatureCollection",
+	"features": [
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-179.6484375,
+					-16.90442787825499
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-179.62921142578125,
+					-16.675662043309767
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-179.95330810546875,
+					-16.830832189624815
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-179.85443115234375,
+					-16.675662043309767
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-180.20050048828125,
+					-16.97274101999901
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-180.142822265625,
+					-16.825574258731486
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-180.0823974609375,
+					-17.069913009885465
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-180.4833984375,
+					-17.295576394503744
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-179.8187255859375,
+					-16.893915964126325
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-180.01922607421875,
+					-16.759837823776632
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-179.76791381835938,
+					-16.784820349855963
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-180.01510620117188,
+					-16.914939206301646
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-179.92721557617188,
+					-16.942528651601
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Polygon",
+				"coordinates": [
+					[
+						[
+							-179.85443115234375,
+							-16.675662043309767
+						],
+						[
+							-179.62921142578125,
+							-16.675662043309767
+						],
+						[
+							-179.6484375,
+							-16.90442787825499
+						],
+						[
+							-179.92721557617188,
+							-16.942528651601
+						],
+						[
+							-180.0823974609375,
+							-17.069913009885465
+						],
+						[
+							-180.20050048828125,
+							-16.97274101999901
+						],
+						[
+							-180.142822265625,
+							-16.825574258731486
+						],
+						[
+							-180.01922607421875,
+							-16.759837823776632
+						],
+						[
+							-179.85443115234375,
+							-16.675662043309767
+						]
+					]
+				]
+			}
+		}
+	]
+}
\ No newline at end of file
diff --git a/packages/turf-concave/test/out/issue-333.geojson b/packages/turf-concave/test/out/issue-333.geojson
index 52e26819fc..011eaec151 100644
--- a/packages/turf-concave/test/out/issue-333.geojson
+++ b/packages/turf-concave/test/out/issue-333.geojson
@@ -1641,11 +1641,56 @@
 		},
 		{
 			"type": "Feature",
+			"properties": {},
 			"geometry": {
 				"type": "MultiPolygon",
 				"coordinates": [
 					[
 						[
+							[
+								-90.53797681111112,
+								14.629561677777778
+							],
+							[
+								-90.51274230000001,
+								14.639448640000001
+							],
+							[
+								-90.5269091,
+								14.6573203
+							],
+							[
+								-90.5269321,
+								14.6573653
+							],
+							[
+								-90.50523385,
+								14.651190725000001
+							],
+							[
+								-90.49116085,
+								14.667282275
+							],
+							[
+								-90.4875626,
+								14.6704823
+							],
+							[
+								-90.4723723,
+								14.6485518
+							],
+							[
+								-90.4722951,
+								14.6482883
+							],
+							[
+								-90.4722628,
+								14.6479208
+							],
+							[
+								-90.4734413,
+								14.6466325
+							],
 							[
 								-90.47394456363637,
 								14.646360845454545
@@ -1733,50 +1778,6 @@
 							[
 								-90.53797681111112,
 								14.629561677777778
-							],
-							[
-								-90.51274230000001,
-								14.639448640000001
-							],
-							[
-								-90.5269091,
-								14.6573203
-							],
-							[
-								-90.5269321,
-								14.6573653
-							],
-							[
-								-90.50523385,
-								14.651190725000001
-							],
-							[
-								-90.49116085,
-								14.667282275
-							],
-							[
-								-90.4875626,
-								14.6704823
-							],
-							[
-								-90.4723723,
-								14.6485518
-							],
-							[
-								-90.4722951,
-								14.6482883
-							],
-							[
-								-90.4722628,
-								14.6479208
-							],
-							[
-								-90.4734413,
-								14.6466325
-							],
-							[
-								-90.47394456363637,
-								14.646360845454545
 							]
 						]
 					],
@@ -1801,8 +1802,7 @@
 						]
 					]
 				]
-			},
-			"properties": {}
+			}
 		}
 	]
 }
\ No newline at end of file
diff --git a/packages/turf-concave/test/out/pts1.geojson b/packages/turf-concave/test/out/pts1.geojson
index 4bc5bec05b..b6841e6d39 100644
--- a/packages/turf-concave/test/out/pts1.geojson
+++ b/packages/turf-concave/test/out/pts1.geojson
@@ -231,6 +231,14 @@
           ],
           [
             [
+              [
+                -122.40898132324217,
+                37.77505678240509
+              ],
+              [
+                -122.4103546142578,
+                37.72184917678752
+              ],
               [
                 -122.44331359863283,
                 37.726194088705576
@@ -246,14 +254,6 @@
               [
                 -122.40898132324217,
                 37.77505678240509
-              ],
-              [
-                -122.4103546142578,
-                37.72184917678752
-              ],
-              [
-                -122.44331359863283,
-                37.726194088705576
               ]
             ]
           ]
diff --git a/packages/turf-concave/test/out/pts2.geojson b/packages/turf-concave/test/out/pts2.geojson
index 6557762c3e..4165198741 100644
--- a/packages/turf-concave/test/out/pts2.geojson
+++ b/packages/turf-concave/test/out/pts2.geojson
@@ -3578,6 +3578,7 @@
     },
     {
       "type": "Feature",
+      "properties": {},
       "geometry": {
         "type": "Polygon",
         "coordinates": [
@@ -3700,6 +3701,10 @@
             ]
           ],
           [
+            [
+              -76.98652958387164,
+              38.9375726751204
+            ],
             [
               -76.99726738315395,
               38.95334052572905
@@ -3719,33 +3724,10 @@
             [
               -76.98652958387164,
               38.9375726751204
-            ],
-            [
-              -76.99726738315395,
-              38.95334052572905
-            ]
-          ],
-          [
-            [
-              -77.04104117667185,
-              38.910212212295264
-            ],
-            [
-              -77.04075566023566,
-              38.915213543219195
-            ],
-            [
-              -77.04075566023566,
-              38.9152135432192
-            ],
-            [
-              -77.04104117667185,
-              38.910212212295264
             ]
           ]
         ]
-      },
-      "properties": {}
+      }
     }
   ]
 }
\ No newline at end of file
diff --git a/packages/turf-concave/test/out/pts3.geojson b/packages/turf-concave/test/out/pts3.geojson
new file mode 100644
index 0000000000..634521e260
--- /dev/null
+++ b/packages/turf-concave/test/out/pts3.geojson
@@ -0,0 +1,130 @@
+{
+	"type": "FeatureCollection",
+	"features": [
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.40898132324217,
+					37.77505678240509
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.41859436035156,
+					37.729724141962045
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.42786407470703,
+					37.738141282210385
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.43198394775389,
+					37.72836644908416
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.47592926025389,
+					37.78645343442073
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.41687774658202,
+					37.76555823017286
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.42820739746094,
+					37.91115885137137
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Polygon",
+				"coordinates": [
+					[
+						[
+							-122.43198394775389,
+							37.72836644908416
+						],
+						[
+							-122.42786407470703,
+							37.738141282210385
+						],
+						[
+							-122.41859436035156,
+							37.729724141962045
+						],
+						[
+							-122.43198394775389,
+							37.72836644908416
+						]
+					]
+				]
+			}
+		}
+	]
+}
\ No newline at end of file
diff --git a/packages/turf-concave/yarn.lock b/packages/turf-concave/yarn.lock
index 4468d73e82..e7657f6054 100644
--- a/packages/turf-concave/yarn.lock
+++ b/packages/turf-concave/yarn.lock
@@ -2,11 +2,7 @@
 # yarn lockfile v1
 
 
-"@turf/clone@^4.6.0":
-  version "4.6.1"
-  resolved "https://registry.yarnpkg.com/@turf/clone/-/clone-4.6.1.tgz#e4136d9dca48a7065a61454009275c63a9f68121"
-
-"@turf/distance@^4.6.0":
+"@turf/distance@4.6.0":
   version "4.6.0"
   resolved "https://registry.yarnpkg.com/@turf/distance/-/distance-4.6.0.tgz#6410b9b4ea7e44e4a99be33018d9daab031946e0"
   dependencies:
@@ -21,26 +17,28 @@
   version "4.6.0"
   resolved "https://registry.yarnpkg.com/@turf/invariant/-/invariant-4.6.0.tgz#ba61401d537543f81ccfc588e12bb0d8e653dd80"
 
+"@turf/meta@^3.7.5":
+  version "3.14.0"
+  resolved "https://registry.yarnpkg.com/@turf/meta/-/meta-3.14.0.tgz#8d3050c1a0f44bf406a633b6bd28c510f7bcee27"
+
 "@turf/meta@^4.6.0":
   version "4.6.0"
   resolved "https://registry.yarnpkg.com/@turf/meta/-/meta-4.6.0.tgz#0d3f9a218e58d1c5e5deedf467c3321dd61203f3"
 
-"@turf/tin@^4.6.0":
+"@turf/tin@4.6.0":
   version "4.6.0"
   resolved "https://registry.yarnpkg.com/@turf/tin/-/tin-4.6.0.tgz#c7f43a60065a642c5cc7c6d01c678449c667c8e6"
   dependencies:
     "@turf/helpers" "^4.6.0"
 
-"@turf/union@^4.6.0":
-  version "4.6.0"
-  resolved "https://registry.yarnpkg.com/@turf/union/-/union-4.6.0.tgz#3b861e35f6ce317e86b33ba2768e5d3f625417b3"
-  dependencies:
-    jsts "1.3.0"
-
 balanced-match@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.0.tgz#89b4d199ab2bee49de164ea02b89ce462d71b767"
 
+base64-js@0.0.2:
+  version "0.0.2"
+  resolved "https://registry.yarnpkg.com/base64-js/-/base64-js-0.0.2.tgz#024f0f72afa25b75f9c0ee73cd4f55ec1bed9784"
+
 benchmark@^2.1.4:
   version "2.1.4"
   resolved "https://registry.yarnpkg.com/benchmark/-/benchmark-2.1.4.tgz#09f3de31c916425d498cc2ee565a0ebf3c2a5629"
@@ -48,6 +46,13 @@ benchmark@^2.1.4:
     lodash "^4.17.4"
     platform "^1.3.3"
 
+bops@0.0.6:
+  version "0.0.6"
+  resolved "https://registry.yarnpkg.com/bops/-/bops-0.0.6.tgz#082d1d55fa01e60dbdc2ebc2dba37f659554cf3a"
+  dependencies:
+    base64-js "0.0.2"
+    to-utf8 "0.0.1"
+
 brace-expansion@^1.1.7:
   version "1.1.8"
   resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.8.tgz#c07b211c7c952ec1f8efd51a77ef0d1d3990a292"
@@ -55,10 +60,20 @@ brace-expansion@^1.1.7:
     balanced-match "^1.0.0"
     concat-map "0.0.1"
 
+commander@2:
+  version "2.11.0"
+  resolved "https://registry.yarnpkg.com/commander/-/commander-2.11.0.tgz#157152fd1e7a6c8d98a5b715cf376df928004563"
+
 concat-map@0.0.1:
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/concat-map/-/concat-map-0.0.1.tgz#d8a96bd77fd68df7793a73036a3ba0d5405d477b"
 
+concat-stream@~1.2.1:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/concat-stream/-/concat-stream-1.2.1.tgz#f35100b6c46378bfba8b6b80f9f0d0ccdf13dc60"
+  dependencies:
+    bops "0.0.6"
+
 deep-equal@~1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/deep-equal/-/deep-equal-1.0.1.tgz#f5d260292b660e084eff4cdbc9f08ad3247448b5"
@@ -119,6 +134,27 @@ function-bind@^1.0.2, function-bind@^1.1.0, function-bind@~1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/function-bind/-/function-bind-1.1.0.tgz#16176714c801798e4e8f2cf7f7529467bb4a5771"
 
+geojson-dissolve@3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/geojson-dissolve/-/geojson-dissolve-3.1.0.tgz#86823271680a1a381f3e72f02648bbcc710ecda1"
+  dependencies:
+    "@turf/meta" "^3.7.5"
+    geojson-flatten "^0.2.1"
+    geojson-linestring-dissolve "0.0.1"
+    topojson-client "^3.0.0"
+    topojson-server "^3.0.0"
+
+geojson-flatten@^0.2.1:
+  version "0.2.1"
+  resolved "https://registry.yarnpkg.com/geojson-flatten/-/geojson-flatten-0.2.1.tgz#476fc6b041e94d016983ec95400f8777bd60c45c"
+  dependencies:
+    concat-stream "~1.2.1"
+    minimist "0.0.5"
+
+geojson-linestring-dissolve@0.0.1:
+  version "0.0.1"
+  resolved "https://registry.yarnpkg.com/geojson-linestring-dissolve/-/geojson-linestring-dissolve-0.0.1.tgz#08ab8cdf386e919d35a0eb38fa1c550e020838db"
+
 glob@~7.1.2:
   version "7.1.2"
   resolved "https://registry.yarnpkg.com/glob/-/glob-7.1.2.tgz#c19c9df9a028702d678612384a6552404c636d15"
@@ -185,10 +221,6 @@ is-symbol@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/is-symbol/-/is-symbol-1.0.1.tgz#3cc59f00025194b6ab2e38dbae6689256b660572"
 
-jsts@1.3.0:
-  version "1.3.0"
-  resolved "https://registry.yarnpkg.com/jsts/-/jsts-1.3.0.tgz#e93a76f97ac9bda7d4625d9d6470f0d60ac80e45"
-
 load-json-file@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/load-json-file/-/load-json-file-2.0.0.tgz#7947e42149af80d696cbf797bcaabcfe1fe29ca8"
@@ -214,6 +246,10 @@ minimatch@^3.0.4:
   dependencies:
     brace-expansion "^1.1.7"
 
+minimist@0.0.5:
+  version "0.0.5"
+  resolved "https://registry.yarnpkg.com/minimist/-/minimist-0.0.5.tgz#d7aa327bcecf518f9106ac6b8f003fa3bcea8566"
+
 minimist@~1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
@@ -310,6 +346,22 @@ through@~2.3.4, through@~2.3.8:
   version "2.3.8"
   resolved "https://registry.yarnpkg.com/through/-/through-2.3.8.tgz#0dd4c9ffaabc357960b1b724115d7e0e86a2e1f5"
 
+to-utf8@0.0.1:
+  version "0.0.1"
+  resolved "https://registry.yarnpkg.com/to-utf8/-/to-utf8-0.0.1.tgz#d17aea72ff2fba39b9e43601be7b3ff72e089852"
+
+topojson-client@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/topojson-client/-/topojson-client-3.0.0.tgz#1f99293a77ef42a448d032a81aa982b73f360d2f"
+  dependencies:
+    commander "2"
+
+topojson-server@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/topojson-server/-/topojson-server-3.0.0.tgz#378e78e87c3972a7b5be2c5d604369b6bae69c5e"
+  dependencies:
+    commander "2"
+
 wrappy@1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/wrappy/-/wrappy-1.0.2.tgz#b5243d8f3ec1aa35f1364605bc0d1036e30ab69f"

From f7885becd9955ca84cc40c9c10e18546fae5104e Mon Sep 17 00:00:00 2001
From: stebogit <stefano.borghi@gmail.com>
Date: Thu, 17 Aug 2017 01:29:23 -0700
Subject: [PATCH 02/12] added hole test

---
 packages/turf-concave/test/in/hole.geojson  | 370 ++++++++++++
 packages/turf-concave/test/out/hole.geojson | 608 ++++++++++++++++++++
 2 files changed, 978 insertions(+)
 create mode 100644 packages/turf-concave/test/in/hole.geojson
 create mode 100644 packages/turf-concave/test/out/hole.geojson

diff --git a/packages/turf-concave/test/in/hole.geojson b/packages/turf-concave/test/in/hole.geojson
new file mode 100644
index 0000000000..e31ccb7e4a
--- /dev/null
+++ b/packages/turf-concave/test/in/hole.geojson
@@ -0,0 +1,370 @@
+{
+	"type": "FeatureCollection",
+	"properties": {
+		"maxEdge": 20
+	},
+	"features": [
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-311.7123413085937,
+					-13.06342578889815
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-311.5777587890625,
+					-13.090179355733726
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-311.5447998046875,
+					-13.237271908200585
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-311.48162841796875,
+					-13.365571074958245
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-311.627197265625,
+					-13.667338259654947
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-311.923828125,
+					-13.098204859664591
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-311.9403076171875,
+					-13.288065114120283
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-312.07763671875,
+					-13.368243250897287
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-311.94580078125,
+					-13.4216805428783
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-311.37451171875,
+					-13.154376055418515
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-311.42120361328125,
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diff --git a/packages/turf-concave/test/out/hole.geojson b/packages/turf-concave/test/out/hole.geojson
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+							-311.8194580078125,
+							-13.114255082724755
+						],
+						[
+							-311.87164306640625,
+							-13.141003126359843
+						],
+						[
+							-311.9403076171875,
+							-13.288065114120283
+						],
+						[
+							-311.94580078125,
+							-13.4216805428783
+						]
+					]
+				]
+			}
+		}
+	]
+}
\ No newline at end of file

From 1abc08486ef6d8940dc8cde3313f028b40f97616 Mon Sep 17 00:00:00 2001
From: stebogit <stefano.borghi@gmail.com>
Date: Thu, 17 Aug 2017 01:34:01 -0700
Subject: [PATCH 03/12] added concave-hull test

---
 .../turf-concave/test/in/concave-hull.geojson | 370 ++++++++++++
 .../test/out/concave-hull.geojson             | 530 ++++++++++++++++++
 2 files changed, 900 insertions(+)
 create mode 100644 packages/turf-concave/test/in/concave-hull.geojson
 create mode 100644 packages/turf-concave/test/out/concave-hull.geojson

diff --git a/packages/turf-concave/test/in/concave-hull.geojson b/packages/turf-concave/test/in/concave-hull.geojson
new file mode 100644
index 0000000000..93716666bd
--- /dev/null
+++ b/packages/turf-concave/test/in/concave-hull.geojson
@@ -0,0 +1,370 @@
+{
+	"type": "FeatureCollection",
+	"properties": {
+		"maxEdge": 100000
+	},
+	"features": [
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-311.7123413085937,
+					-13.06342578889815
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-311.5777587890625,
+					-13.090179355733726
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-311.5447998046875,
+					-13.237271908200585
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-311.48162841796875,
+					-13.365571074958245
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-311.627197265625,
+					-13.667338259654947
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
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+					-311.923828125,
+					-13.098204859664591
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+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-311.9403076171875,
+					-13.288065114120283
+				]
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+		{
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+			"geometry": {
+				"type": "Point",
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+					-13.368243250897287
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+		{
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+				"type": "Point",
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+					-311.37451171875,
+					-13.154376055418515
+				]
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+		},
+		{
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+		{
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+			"geometry": {
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+				"coordinates": [
+					-311.53656005859375,
+					-13.603278132528756
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+}
\ No newline at end of file
diff --git a/packages/turf-concave/test/out/concave-hull.geojson b/packages/turf-concave/test/out/concave-hull.geojson
new file mode 100644
index 0000000000..e8f6eb68c8
--- /dev/null
+++ b/packages/turf-concave/test/out/concave-hull.geojson
@@ -0,0 +1,530 @@
+{
+	"type": "FeatureCollection",
+	"features": [
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
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+				"coordinates": [
+					-311.7123413085937,
+					-13.06342578889815
+				]
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+		},
+		{
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+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
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+					-13.090179355733726
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+				"marker-size": "small"
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+					-311.5447998046875,
+					-13.237271908200585
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+					-311.87164306640625,
+					-13.141003126359843
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-311.7864990234375,
+					-13.672675818669807
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-311.802978515625,
+					-13.042020847922622
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-311.53656005859375,
+					-13.603278132528756
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "Polygon",
+				"coordinates": [
+					[
+						[
+							-312.0172119140625,
+							-13.536530399503015
+						],
+						[
+							-312.07763671875,
+							-13.368243250897287
+						],
+						[
+							-311.978759765625,
+							-13.18914225554674
+						],
+						[
+							-311.923828125,
+							-13.098204859664591
+						],
+						[
+							-311.802978515625,
+							-13.042020847922622
+						],
+						[
+							-311.4459228515625,
+							-13.095529720741482
+						],
+						[
+							-311.37451171875,
+							-13.154376055418515
+						],
+						[
+							-311.3470458984375,
+							-13.389619591747595
+						],
+						[
+							-311.4788818359375,
+							-13.552551566455168
+						],
+						[
+							-311.53656005859375,
+							-13.603278132528756
+						],
+						[
+							-311.627197265625,
+							-13.667338259654947
+						],
+						[
+							-311.7864990234375,
+							-13.672675818669807
+						],
+						[
+							-312.0172119140625,
+							-13.536530399503015
+						]
+					]
+				]
+			}
+		}
+	]
+}
\ No newline at end of file

From 1d4bc352251a86bbd6965ff06e0e9a1f296b1404 Mon Sep 17 00:00:00 2001
From: Denis <carriere.denis@gmail.com>
Date: Thu, 17 Aug 2017 13:51:28 -0400
Subject: [PATCH 04/12] Add contributors of geojson-dissolve

---
 packages/turf-concave/package.json | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/packages/turf-concave/package.json b/packages/turf-concave/package.json
index a60aa7e1ed..72a5955fe0 100644
--- a/packages/turf-concave/package.json
+++ b/packages/turf-concave/package.json
@@ -29,7 +29,9 @@
     "Denis Carriere <@DenisCarriere>",
     "Stefano Borghi <@stebogit>",
     "Rowan Winsemius <@rowanwins>",
-    "Daniel Pulido <@dpmcmlxxvi>"
+    "Daniel Pulido <@dpmcmlxxvi>",
+    "Stephen Whitmore <@noffle>",
+    "Gregor MacLennan <@gmaclennan>"
   ],
   "license": "MIT",
   "bugs": {

From 3abf424f70138fcc5b3dd5d58919a74b595c5c01 Mon Sep 17 00:00:00 2001
From: Denis <carriere.denis@gmail.com>
Date: Thu, 17 Aug 2017 14:20:07 -0400
Subject: [PATCH 05/12] Add Typescript Units from @turf/helpers Also include
 Polygon or MultiPolygon as valid output

---
 packages/turf-concave/index.d.ts | 6 ++++--
 packages/turf-concave/test.js    | 7 +++----
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/packages/turf-concave/index.d.ts b/packages/turf-concave/index.d.ts
index dfb47ce9df..406429d2cf 100644
--- a/packages/turf-concave/index.d.ts
+++ b/packages/turf-concave/index.d.ts
@@ -1,11 +1,13 @@
 /// <reference types="geojson" />
 
+import {Units} from '@turf/helpers'
+
 type Points = GeoJSON.FeatureCollection<GeoJSON.Point>;
-type Polygon = GeoJSON.Feature<GeoJSON.Polygon>;
+type Polygon = GeoJSON.Feature<GeoJSON.Polygon | GeoJSON.MultiPolygon>;
 
 /**
  * http://turfjs.org/docs/#concave
  */
-declare function concave(points: Points, maxEdge: number, units: string): Polygon;
+declare function concave(points: Points, maxEdge: number, units?: Units): Polygon;
 declare namespace concave { }
 export = concave;
diff --git a/packages/turf-concave/test.js b/packages/turf-concave/test.js
index 78249047c4..0184f0d7a4 100644
--- a/packages/turf-concave/test.js
+++ b/packages/turf-concave/test.js
@@ -21,10 +21,9 @@ const fixtures = fs.readdirSync(directories.in).map(filename => {
 });
 
 test('turf-concave', t => {
-    for(const {filename, name, geojson}  of fixtures) {
+    for (const {filename, name, geojson}  of fixtures) {
         let {maxEdge, units} = geojson.properties;
-        maxEdge = maxEdge || 1;
-        const hull = concave(geojson, maxEdge, units);
+        const hull = concave(geojson, maxEdge || 1, units);
         featureEach(geojson, stylePt);
         const results = featureCollection([...geojson.features, hull]);
 
@@ -49,7 +48,7 @@ test('concave -- throw', t => {
     t.end();
 });
 
-function stylePt(pt){
+function stylePt(pt) {
     pt.properties['marker-color'] = '#f0f';
     pt.properties['marker-size'] = 'small';
 }

From 5a67910b082910cb1d213d5d934b87adeaadc8cd Mon Sep 17 00:00:00 2001
From: Denis <carriere.denis@gmail.com>
Date: Thu, 17 Aug 2017 14:35:51 -0400
Subject: [PATCH 06/12] Update benchmark & add Mike to contributors

---
 packages/turf-concave/bench.js     | 33 +++++++++++++++++++++---------
 packages/turf-concave/package.json |  4 +++-
 packages/turf-concave/yarn.lock    | 21 ++++++++++++++++++-
 3 files changed, 46 insertions(+), 12 deletions(-)

diff --git a/packages/turf-concave/bench.js b/packages/turf-concave/bench.js
index 2362106334..828bc8057c 100644
--- a/packages/turf-concave/bench.js
+++ b/packages/turf-concave/bench.js
@@ -2,6 +2,7 @@ const fs = require('fs');
 const path = require('path');
 const load = require('load-json-file');
 const Benchmark = require('benchmark');
+const dbscan = require('@turf/clusters-dbscan');
 const concave = require('./');
 
 const directory = path.join(__dirname, 'test', 'in') + path.sep;
@@ -15,11 +16,13 @@ const fixtures = fs.readdirSync(directory).map(filename => {
 /**
  * Single Process Benchmark
  *
- * fiji: 17.973ms
- * issue-333: 31.418ms
- * pts1: 1.207ms
- * pts2: 17.366ms
- * pts3: 0.853ms
+ * concave-hull: 15.922ms
+ * fiji: 3.523ms
+ * hole: 8.207ms
+ * issue-333: 24.505ms
+ * pts1: 0.932ms
+ * pts2: 13.297ms
+ * pts3: 0.375ms
  */
 for (const {name, geojson} of fixtures) {
     const {maxEdge, units} = geojson.properties || {maxEdge: 1};
@@ -31,16 +34,26 @@ for (const {name, geojson} of fixtures) {
 /**
  * Benchmark Results
  *
- * fiji x 1,513 ops/sec ±10.80% (63 runs sampled)
- * issue-333 x 183 ops/sec ±2.41% (74 runs sampled)
- * pts1 x 2,934 ops/sec ±2.35% (78 runs sampled)
- * pts2 x 136 ops/sec ±3.87% (67 runs sampled)
- * pts3 x 7,215 ops/sec ±9.04% (70 runs sampled)
+ * concave-hull x 812 ops/sec ±4.31% (83 runs sampled)
+ * concave-hull-- dbscan x 3,433 ops/sec ±1.06% (91 runs sampled)
+ * fiji x 2,640 ops/sec ±0.96% (90 runs sampled)
+ * fiji-- dbscan x 12,261 ops/sec ±1.45% (90 runs sampled)
+ * hole x 1,071 ops/sec ±1.15% (89 runs sampled)
+ * hole-- dbscan x 3,513 ops/sec ±1.43% (91 runs sampled)
+ * issue-333 x 240 ops/sec ±3.62% (78 runs sampled)
+ * issue-333-- dbscan x 368 ops/sec ±0.97% (85 runs sampled)
+ * pts1 x 4,003 ops/sec ±2.25% (84 runs sampled)
+ * pts1-- dbscan x 12,535 ops/sec ±1.35% (90 runs sampled)
+ * pts2 x 182 ops/sec ±1.95% (77 runs sampled)
+ * pts2-- dbscan x 214 ops/sec ±5.51% (74 runs sampled)
+ * pts3 x 11,262 ops/sec ±3.38% (83 runs sampled)
+ * pts3-- dbscan x 27,653 ops/sec ±1.17% (85 runs sampled)
  */
 const suite = new Benchmark.Suite('turf-transform-scale');
 for (const {name, geojson} of fixtures) {
     const {maxEdge, units} = geojson.properties || {maxEdge: 1};
     suite.add(name, () => concave(geojson, maxEdge, units));
+    suite.add(name + '-- dbscan', () => dbscan(geojson, maxEdge, units));
 }
 
 suite
diff --git a/packages/turf-concave/package.json b/packages/turf-concave/package.json
index 72a5955fe0..0a03f3f6fe 100644
--- a/packages/turf-concave/package.json
+++ b/packages/turf-concave/package.json
@@ -31,7 +31,8 @@
     "Rowan Winsemius <@rowanwins>",
     "Daniel Pulido <@dpmcmlxxvi>",
     "Stephen Whitmore <@noffle>",
-    "Gregor MacLennan <@gmaclennan>"
+    "Gregor MacLennan <@gmaclennan>",
+    "Mike Bostock <@mbostock>"
   ],
   "license": "MIT",
   "bugs": {
@@ -39,6 +40,7 @@
   },
   "homepage": "https://github.com/Turfjs/turf",
   "devDependencies": {
+    "@turf/clusters-dbscan": "^4.6.1",
     "@turf/meta": "^4.6.0",
     "benchmark": "^2.1.4",
     "load-json-file": "^2.0.0",
diff --git a/packages/turf-concave/yarn.lock b/packages/turf-concave/yarn.lock
index e7657f6054..5d57998e15 100644
--- a/packages/turf-concave/yarn.lock
+++ b/packages/turf-concave/yarn.lock
@@ -2,7 +2,22 @@
 # yarn lockfile v1
 
 
-"@turf/distance@4.6.0":
+"@turf/clone@^4.6.1":
+  version "4.6.1"
+  resolved "https://registry.yarnpkg.com/@turf/clone/-/clone-4.6.1.tgz#e4136d9dca48a7065a61454009275c63a9f68121"
+
+"@turf/clusters-dbscan@^4.6.1":
+  version "4.6.1"
+  resolved "https://registry.yarnpkg.com/@turf/clusters-dbscan/-/clusters-dbscan-4.6.1.tgz#fff17d7cf5c45a44b3afcc6fae566341e4b4707c"
+  dependencies:
+    "@turf/clone" "^4.6.1"
+    "@turf/distance" "^4.6.0"
+    "@turf/helpers" "^4.6.0"
+    "@turf/invariant" "^4.6.0"
+    "@turf/meta" "^4.6.0"
+    density-clustering "1.3.0"
+
+"@turf/distance@4.6.0", "@turf/distance@^4.6.0":
   version "4.6.0"
   resolved "https://registry.yarnpkg.com/@turf/distance/-/distance-4.6.0.tgz#6410b9b4ea7e44e4a99be33018d9daab031946e0"
   dependencies:
@@ -89,6 +104,10 @@ defined@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/defined/-/defined-1.0.0.tgz#c98d9bcef75674188e110969151199e39b1fa693"
 
+density-clustering@1.3.0:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/density-clustering/-/density-clustering-1.3.0.tgz#dc9f59c8f0ab97e1624ac64930fd3194817dcac5"
+
 detect-indent@^5.0.0:
   version "5.0.0"
   resolved "https://registry.yarnpkg.com/detect-indent/-/detect-indent-5.0.0.tgz#3871cc0a6a002e8c3e5b3cf7f336264675f06b9d"

From 8542491b9fe44e22c21ebeea9741ef43ae35b75c Mon Sep 17 00:00:00 2001
From: Denis <carriere.denis@gmail.com>
Date: Thu, 17 Aug 2017 14:43:59 -0400
Subject: [PATCH 07/12] Remove dbscan from testing

---
 packages/turf-concave/bench.js     |  9 ---------
 packages/turf-concave/package.json |  1 -
 packages/turf-concave/yarn.lock    | 30 ++++++------------------------
 3 files changed, 6 insertions(+), 34 deletions(-)

diff --git a/packages/turf-concave/bench.js b/packages/turf-concave/bench.js
index 828bc8057c..e0a7e2143f 100644
--- a/packages/turf-concave/bench.js
+++ b/packages/turf-concave/bench.js
@@ -2,7 +2,6 @@ const fs = require('fs');
 const path = require('path');
 const load = require('load-json-file');
 const Benchmark = require('benchmark');
-const dbscan = require('@turf/clusters-dbscan');
 const concave = require('./');
 
 const directory = path.join(__dirname, 'test', 'in') + path.sep;
@@ -35,25 +34,17 @@ for (const {name, geojson} of fixtures) {
  * Benchmark Results
  *
  * concave-hull x 812 ops/sec ±4.31% (83 runs sampled)
- * concave-hull-- dbscan x 3,433 ops/sec ±1.06% (91 runs sampled)
  * fiji x 2,640 ops/sec ±0.96% (90 runs sampled)
- * fiji-- dbscan x 12,261 ops/sec ±1.45% (90 runs sampled)
  * hole x 1,071 ops/sec ±1.15% (89 runs sampled)
- * hole-- dbscan x 3,513 ops/sec ±1.43% (91 runs sampled)
  * issue-333 x 240 ops/sec ±3.62% (78 runs sampled)
- * issue-333-- dbscan x 368 ops/sec ±0.97% (85 runs sampled)
  * pts1 x 4,003 ops/sec ±2.25% (84 runs sampled)
- * pts1-- dbscan x 12,535 ops/sec ±1.35% (90 runs sampled)
  * pts2 x 182 ops/sec ±1.95% (77 runs sampled)
- * pts2-- dbscan x 214 ops/sec ±5.51% (74 runs sampled)
  * pts3 x 11,262 ops/sec ±3.38% (83 runs sampled)
- * pts3-- dbscan x 27,653 ops/sec ±1.17% (85 runs sampled)
  */
 const suite = new Benchmark.Suite('turf-transform-scale');
 for (const {name, geojson} of fixtures) {
     const {maxEdge, units} = geojson.properties || {maxEdge: 1};
     suite.add(name, () => concave(geojson, maxEdge, units));
-    suite.add(name + '-- dbscan', () => dbscan(geojson, maxEdge, units));
 }
 
 suite
diff --git a/packages/turf-concave/package.json b/packages/turf-concave/package.json
index 0a03f3f6fe..3b43063040 100644
--- a/packages/turf-concave/package.json
+++ b/packages/turf-concave/package.json
@@ -40,7 +40,6 @@
   },
   "homepage": "https://github.com/Turfjs/turf",
   "devDependencies": {
-    "@turf/clusters-dbscan": "^4.6.1",
     "@turf/meta": "^4.6.0",
     "benchmark": "^2.1.4",
     "load-json-file": "^2.0.0",
diff --git a/packages/turf-concave/yarn.lock b/packages/turf-concave/yarn.lock
index 5d57998e15..2c3a02608b 100644
--- a/packages/turf-concave/yarn.lock
+++ b/packages/turf-concave/yarn.lock
@@ -2,22 +2,7 @@
 # yarn lockfile v1
 
 
-"@turf/clone@^4.6.1":
-  version "4.6.1"
-  resolved "https://registry.yarnpkg.com/@turf/clone/-/clone-4.6.1.tgz#e4136d9dca48a7065a61454009275c63a9f68121"
-
-"@turf/clusters-dbscan@^4.6.1":
-  version "4.6.1"
-  resolved "https://registry.yarnpkg.com/@turf/clusters-dbscan/-/clusters-dbscan-4.6.1.tgz#fff17d7cf5c45a44b3afcc6fae566341e4b4707c"
-  dependencies:
-    "@turf/clone" "^4.6.1"
-    "@turf/distance" "^4.6.0"
-    "@turf/helpers" "^4.6.0"
-    "@turf/invariant" "^4.6.0"
-    "@turf/meta" "^4.6.0"
-    density-clustering "1.3.0"
-
-"@turf/distance@4.6.0", "@turf/distance@^4.6.0":
+"@turf/distance@4.6.0":
   version "4.6.0"
   resolved "https://registry.yarnpkg.com/@turf/distance/-/distance-4.6.0.tgz#6410b9b4ea7e44e4a99be33018d9daab031946e0"
   dependencies:
@@ -104,10 +89,6 @@ defined@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/defined/-/defined-1.0.0.tgz#c98d9bcef75674188e110969151199e39b1fa693"
 
-density-clustering@1.3.0:
-  version "1.3.0"
-  resolved "https://registry.yarnpkg.com/density-clustering/-/density-clustering-1.3.0.tgz#dc9f59c8f0ab97e1624ac64930fd3194817dcac5"
-
 detect-indent@^5.0.0:
   version "5.0.0"
   resolved "https://registry.yarnpkg.com/detect-indent/-/detect-indent-5.0.0.tgz#3871cc0a6a002e8c3e5b3cf7f336264675f06b9d"
@@ -119,13 +100,14 @@ error-ex@^1.2.0:
     is-arrayish "^0.2.1"
 
 es-abstract@^1.5.0:
-  version "1.7.0"
-  resolved "https://registry.yarnpkg.com/es-abstract/-/es-abstract-1.7.0.tgz#dfade774e01bfcd97f96180298c449c8623fb94c"
+  version "1.8.0"
+  resolved "https://registry.yarnpkg.com/es-abstract/-/es-abstract-1.8.0.tgz#3b00385e85729932beffa9163bbea1234e932914"
   dependencies:
     es-to-primitive "^1.1.1"
     function-bind "^1.1.0"
+    has "^1.0.1"
     is-callable "^1.1.3"
-    is-regex "^1.0.3"
+    is-regex "^1.0.4"
 
 es-to-primitive@^1.1.1:
   version "1.1.1"
@@ -230,7 +212,7 @@ is-plain-obj@^1.0.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/is-plain-obj/-/is-plain-obj-1.1.0.tgz#71a50c8429dfca773c92a390a4a03b39fcd51d3e"
 
-is-regex@^1.0.3:
+is-regex@^1.0.4:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/is-regex/-/is-regex-1.0.4.tgz#5517489b547091b0930e095654ced25ee97e9491"
   dependencies:

From c5d204ad4e66227a9200ac78f466696430667d97 Mon Sep 17 00:00:00 2001
From: Denis <carriere.denis@gmail.com>
Date: Thu, 17 Aug 2017 15:09:24 -0400
Subject: [PATCH 08/12] Remove properties from featureCollection method

---
 packages/turf-concave/index.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/turf-concave/index.js b/packages/turf-concave/index.js
index 86adaa4053..e209d44352 100644
--- a/packages/turf-concave/index.js
+++ b/packages/turf-concave/index.js
@@ -80,5 +80,5 @@ function removeDuplicates(points) {
             existing[key] = true;
         }
     });
-    return featureCollection(cleaned, points.properties);
+    return featureCollection(cleaned);
 }

From 6aec6153dff67f30adb7c37d5123e8ad3bed0eaa Mon Sep 17 00:00:00 2001
From: Denis <carriere.denis@gmail.com>
Date: Thu, 17 Aug 2017 15:10:04 -0400
Subject: [PATCH 09/12] Update readme

---
 packages/turf-concave/README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/turf-concave/README.md b/packages/turf-concave/README.md
index c5a1dc0712..d1e8e2e755 100644
--- a/packages/turf-concave/README.md
+++ b/packages/turf-concave/README.md
@@ -2,7 +2,7 @@
 
 # concave
 
-Takes a set of [points](http://geojson.org/geojson-spec.html#point) and returns a concave hull polygon.
+Takes a set of [points](http://geojson.org/geojson-spec.html#point) and returns a concave hull Polygon or MultiPolygon.
 Internally, this uses [turf-tin](https://github.com/Turfjs/turf-tin) to generate geometries.
 
 **Parameters**

From eb301040162e05fcc0aff3e412b18f8116ba7c25 Mon Sep 17 00:00:00 2001
From: Denis <carriere.denis@gmail.com>
Date: Thu, 17 Aug 2017 16:05:00 -0400
Subject: [PATCH 10/12] truncate @turf/simplified results (?)

---
 packages/turf-simplify/package.json           |   1 +
 packages/turf-simplify/test.js                |   3 +-
 .../test/out/featurecollection.geojson        |  80 ++++-----
 .../turf-simplify/test/out/fiji-hiQ.geojson   |  56 +++----
 .../test/out/geometrycollection.geojson       |  80 ++++-----
 .../turf-simplify/test/out/linestring.geojson |  96 +++++------
 .../test/out/multilinestring.geojson          | 156 +++++++++---------
 .../test/out/multipolygon.geojson             |  64 +++----
 .../turf-simplify/test/out/polygon.geojson    |  12 +-
 .../test/out/simple-polygon.geojson           |  16 +-
 10 files changed, 283 insertions(+), 281 deletions(-)

diff --git a/packages/turf-simplify/package.json b/packages/turf-simplify/package.json
index c5dcc0b84d..f97be0a093 100644
--- a/packages/turf-simplify/package.json
+++ b/packages/turf-simplify/package.json
@@ -31,6 +31,7 @@
   },
   "homepage": "https://github.com/Turfjs/turf",
   "devDependencies": {
+    "@turf/truncate": "^4.6.0",
     "benchmark": "^2.1.4",
     "load-json-file": "^2.0.0",
     "tape": "^4.6.3",
diff --git a/packages/turf-simplify/test.js b/packages/turf-simplify/test.js
index d55c2b8e7b..58a1db3a96 100644
--- a/packages/turf-simplify/test.js
+++ b/packages/turf-simplify/test.js
@@ -3,6 +3,7 @@ const test = require('tape');
 const path = require('path');
 const load = require('load-json-file');
 const write = require('write-json-file');
+const truncate = require('@turf/truncate');
 const {polygon} = require('@turf/helpers');
 const simplify = require('./');
 
@@ -26,7 +27,7 @@ test('simplify', t => {
         tolerance = tolerance || 0.01;
         highQuality = highQuality || false;
 
-        const simplified = simplify(geojson, tolerance, highQuality);
+        const simplified = truncate(simplify(geojson, tolerance, highQuality));
 
         if (process.env.REGEN) write.sync(directories.out + filename, simplified);
         t.deepEqual(simplified, load.sync(directories.out + filename), name);
diff --git a/packages/turf-simplify/test/out/featurecollection.geojson b/packages/turf-simplify/test/out/featurecollection.geojson
index 8f7149c515..1539f80aa5 100644
--- a/packages/turf-simplify/test/out/featurecollection.geojson
+++ b/packages/turf-simplify/test/out/featurecollection.geojson
@@ -10,12 +10,12 @@
 				"type": "LineString",
 				"coordinates": [
 					[
-						27.977542877197266,
-						-26.17500493262446
+						27.977543,
+						-26.175005
 					],
 					[
-						27.96432495117187,
-						-26.183015655416536
+						27.964325,
+						-26.183016
 					]
 				]
 			}
@@ -30,20 +30,20 @@
 				"coordinates": [
 					[
 						[
-							27.972049713134762,
-							-26.199035448897074
+							27.97205,
+							-26.199035
 						],
 						[
-							27.98406600952148,
-							-26.192258112838022
+							27.984066,
+							-26.192258
 						],
 						[
-							27.98715591430664,
-							-26.201345814222698
+							27.987156,
+							-26.201346
 						],
 						[
-							27.972049713134762,
-							-26.199035448897074
+							27.97205,
+							-26.199035
 						]
 					]
 				]
@@ -59,58 +59,58 @@
 				"coordinates": [
 					[
 						[
-							27.946643829345703,
-							-26.170845301716803
+							27.946644,
+							-26.170845
 						],
 						[
-							27.94269561767578,
-							-26.183631842055114
+							27.942696,
+							-26.183632
 						],
 						[
-							27.928619384765625,
-							-26.165298896316028
+							27.928619,
+							-26.165299
 						],
 						[
-							27.94509887695312,
-							-26.158981835530525
+							27.945099,
+							-26.158982
 						],
 						[
-							27.954025268554688,
-							-26.173464345889972
+							27.954025,
+							-26.173464
 						],
 						[
-							27.936172485351562,
-							-26.194876675795218
+							27.936172,
+							-26.194877
 						],
 						[
-							27.916603088378906,
-							-26.16683959094609
+							27.916603,
+							-26.16684
 						],
 						[
-							27.930335998535156,
-							-26.18856121785662
+							27.930336,
+							-26.188561
 						],
 						[
-							27.946643829345703,
-							-26.170845301716803
+							27.946644,
+							-26.170845
 						]
 					],
 					[
 						[
-							27.936859130859375,
-							-26.16591517661071
+							27.936859,
+							-26.165915
 						],
 						[
-							27.93497085571289,
-							-26.173926524048102
+							27.934971,
+							-26.173927
 						],
 						[
-							27.94149398803711,
-							-26.17007498340995
+							27.941494,
+							-26.170075
 						],
 						[
-							27.936859130859375,
-							-26.16591517661071
+							27.936859,
+							-26.165915
 						]
 					]
 				]
@@ -124,8 +124,8 @@
 			"geometry": {
 				"type": "Point",
 				"coordinates": [
-					27.95642852783203,
-					-26.152510345365126
+					27.956429,
+					-26.15251
 				]
 			}
 		}
diff --git a/packages/turf-simplify/test/out/fiji-hiQ.geojson b/packages/turf-simplify/test/out/fiji-hiQ.geojson
index 8fe5b67aa4..d1bc43bf23 100644
--- a/packages/turf-simplify/test/out/fiji-hiQ.geojson
+++ b/packages/turf-simplify/test/out/fiji-hiQ.geojson
@@ -9,60 +9,60 @@
 		"coordinates": [
 			[
 				[
-					179.97528076171875,
-					-16.514770282237
+					179.975281,
+					-16.51477
 				],
 				[
-					179.98043060302734,
-					-16.539126548282127
+					179.980431,
+					-16.539127
 				],
 				[
-					180.01029968261716,
-					-16.523328239288848
+					180.0103,
+					-16.523328
 				],
 				[
-					180.00755310058594,
-					-16.534847967269407
+					180.007553,
+					-16.534848
 				],
 				[
-					180.01819610595703,
-					-16.539126548282127
+					180.018196,
+					-16.539127
 				],
 				[
-					180.06145477294922,
-					-16.525632239869275
+					180.061455,
+					-16.525632
 				],
 				[
-					180.0666046142578,
-					-16.513124477808333
+					180.066605,
+					-16.513124
 				],
 				[
-					180.04634857177734,
-					-16.479547009916406
+					180.046349,
+					-16.479547
 				],
 				[
-					180.08686065673828,
-					-16.44761009512282
+					180.086861,
+					-16.44761
 				],
 				[
-					180.08411407470703,
-					-16.441353794870704
+					180.084114,
+					-16.441354
 				],
 				[
-					180.05561828613278,
-					-16.439707366557357
+					180.055618,
+					-16.439707
 				],
 				[
-					180.02609252929688,
-					-16.46473156961583
+					180.026093,
+					-16.464732
 				],
 				[
-					180.01441955566406,
-					-16.464073079315213
+					180.01442,
+					-16.464073
 				],
 				[
-					179.97528076171875,
-					-16.514770282237
+					179.975281,
+					-16.51477
 				]
 			]
 		]
diff --git a/packages/turf-simplify/test/out/geometrycollection.geojson b/packages/turf-simplify/test/out/geometrycollection.geojson
index 9df7c416fb..ff5ac8b4df 100644
--- a/packages/turf-simplify/test/out/geometrycollection.geojson
+++ b/packages/turf-simplify/test/out/geometrycollection.geojson
@@ -5,12 +5,12 @@
 			"type": "LineString",
 			"coordinates": [
 				[
-					27.977542877197266,
-					-26.17500493262446
+					27.977543,
+					-26.175005
 				],
 				[
-					27.96432495117187,
-					-26.183015655416536
+					27.964325,
+					-26.183016
 				]
 			]
 		},
@@ -19,20 +19,20 @@
 			"coordinates": [
 				[
 					[
-						27.972049713134762,
-						-26.199035448897074
+						27.97205,
+						-26.199035
 					],
 					[
-						27.98406600952148,
-						-26.192258112838022
+						27.984066,
+						-26.192258
 					],
 					[
-						27.98715591430664,
-						-26.201345814222698
+						27.987156,
+						-26.201346
 					],
 					[
-						27.972049713134762,
-						-26.199035448897074
+						27.97205,
+						-26.199035
 					]
 				]
 			]
@@ -42,58 +42,58 @@
 			"coordinates": [
 				[
 					[
-						27.946643829345703,
-						-26.170845301716803
+						27.946644,
+						-26.170845
 					],
 					[
-						27.94269561767578,
-						-26.183631842055114
+						27.942696,
+						-26.183632
 					],
 					[
-						27.928619384765625,
-						-26.165298896316028
+						27.928619,
+						-26.165299
 					],
 					[
-						27.94509887695312,
-						-26.158981835530525
+						27.945099,
+						-26.158982
 					],
 					[
-						27.954025268554688,
-						-26.173464345889972
+						27.954025,
+						-26.173464
 					],
 					[
-						27.936172485351562,
-						-26.194876675795218
+						27.936172,
+						-26.194877
 					],
 					[
-						27.916603088378906,
-						-26.16683959094609
+						27.916603,
+						-26.16684
 					],
 					[
-						27.930335998535156,
-						-26.18856121785662
+						27.930336,
+						-26.188561
 					],
 					[
-						27.946643829345703,
-						-26.170845301716803
+						27.946644,
+						-26.170845
 					]
 				],
 				[
 					[
-						27.936859130859375,
-						-26.16591517661071
+						27.936859,
+						-26.165915
 					],
 					[
-						27.93497085571289,
-						-26.173926524048102
+						27.934971,
+						-26.173927
 					],
 					[
-						27.94149398803711,
-						-26.17007498340995
+						27.941494,
+						-26.170075
 					],
 					[
-						27.936859130859375,
-						-26.16591517661071
+						27.936859,
+						-26.165915
 					]
 				]
 			]
@@ -101,8 +101,8 @@
 		{
 			"type": "Point",
 			"coordinates": [
-				27.95642852783203,
-				-26.152510345365126
+				27.956429,
+				-26.15251
 			]
 		}
 	]
diff --git a/packages/turf-simplify/test/out/linestring.geojson b/packages/turf-simplify/test/out/linestring.geojson
index a490f8736a..d9903af460 100644
--- a/packages/turf-simplify/test/out/linestring.geojson
+++ b/packages/turf-simplify/test/out/linestring.geojson
@@ -5,100 +5,100 @@
 		"type": "LineString",
 		"coordinates": [
 			[
-				-80.51399230957031,
-				28.069556808283608
+				-80.513992,
+				28.069557
 			],
 			[
-				-80.48583984375,
-				28.042288740362853
+				-80.48584,
+				28.042289
 			],
 			[
-				-80.50575256347656,
-				28.028349057505775
+				-80.505753,
+				28.028349
 			],
 			[
-				-80.47691345214844,
-				28.021075462659883
+				-80.476913,
+				28.021075
 			],
 			[
-				-80.49201965332031,
-				27.998039170620494
+				-80.49202,
+				27.998039
 			],
 			[
-				-80.46730041503906,
-				27.962262536875905
+				-80.4673,
+				27.962263
 			],
 			[
-				-80.46524047851562,
-				27.91980029694533
+				-80.46524,
+				27.9198
 			],
 			[
-				-80.40550231933594,
-				27.930114089618602
+				-80.405502,
+				27.930114
 			],
 			[
-				-80.39657592773438,
-				27.980455528671527
+				-80.396576,
+				27.980456
 			],
 			[
-				-80.42953491210938,
-				27.990763528690582
+				-80.429535,
+				27.990764
 			],
 			[
-				-80.4144287109375,
-				28.00955793247135
+				-80.414429,
+				28.009558
 			],
 			[
-				-80.3594970703125,
-				27.972572275562527
+				-80.359497,
+				27.972572
 			],
 			[
-				-80.38215637207031,
-				27.913732900444284
+				-80.382156,
+				27.913733
 			],
 			[
-				-80.41786193847656,
-				27.881570017022806
+				-80.417862,
+				27.88157
 			],
 			[
-				-80.39382934570312,
-				27.85425440786446
+				-80.393829,
+				27.854254
 			],
 			[
-				-80.36842346191405,
-				27.888246118437756
+				-80.368423,
+				27.888246
 			],
 			[
-				-80.35469055175781,
-				27.86882358965466
+				-80.354691,
+				27.868824
 			],
 			[
-				-80.3594970703125,
-				27.8421119273228
+				-80.359497,
+				27.842112
 			],
 			[
-				-80.39932250976561,
-				27.82511017099003
+				-80.399323,
+				27.82511
 			],
 			[
-				-80.40069580078125,
-				27.79352841586229
+				-80.400696,
+				27.793528
 			],
 			[
-				-80.36155700683594,
-				27.786846483587688
+				-80.361557,
+				27.786846
 			],
 			[
-				-80.35932540893555,
-				27.806853088493792
+				-80.359325,
+				27.806853
 			],
 			[
-				-80.35499095916748,
-				27.796831264786892
+				-80.354991,
+				27.796831
 			],
 			[
-				-80.32872676849365,
-				27.80848534345178
+				-80.328727,
+				27.808485
 			]
 		]
 	}
diff --git a/packages/turf-simplify/test/out/multilinestring.geojson b/packages/turf-simplify/test/out/multilinestring.geojson
index 7b98cad54a..f8b7208b16 100644
--- a/packages/turf-simplify/test/out/multilinestring.geojson
+++ b/packages/turf-simplify/test/out/multilinestring.geojson
@@ -6,162 +6,162 @@
 		"coordinates": [
 			[
 				[
-					-80.51399230957031,
-					28.069556808283608
+					-80.513992,
+					28.069557
 				],
 				[
-					-80.48583984375,
-					28.042288740362853
+					-80.48584,
+					28.042289
 				],
 				[
-					-80.50575256347656,
-					28.028349057505775
+					-80.505753,
+					28.028349
 				],
 				[
-					-80.47691345214844,
-					28.021075462659883
+					-80.476913,
+					28.021075
 				],
 				[
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+					-80.49202,
+					27.998039
 				],
 				[
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-					27.962262536875905
+					-80.4673,
+					27.962263
 				],
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-					27.91980029694533
+					-80.46524,
+					27.9198
 				],
 				[
-					-80.40550231933594,
-					27.930114089618602
+					-80.405502,
+					27.930114
 				],
 				[
-					-80.39657592773438,
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+					-80.396576,
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 				],
 				[
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 				[
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 				],
 				[
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 				[
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 				[
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 				[
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 			],
 			[
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 				[
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-					27.853647316127383
+					-80.292206,
+					27.853647
 				],
 				[
-					-80.30319213867188,
-					27.860932192608534
+					-80.303192,
+					27.860932
 				],
 				[
-					-80.2935791015625,
-					27.894921808206057
+					-80.293579,
+					27.894922
 				]
 			]
 		]
diff --git a/packages/turf-simplify/test/out/multipolygon.geojson b/packages/turf-simplify/test/out/multipolygon.geojson
index 777698340e..0b90d856c0 100644
--- a/packages/turf-simplify/test/out/multipolygon.geojson
+++ b/packages/turf-simplify/test/out/multipolygon.geojson
@@ -10,76 +10,76 @@
 			[
 				[
 					[
-						19.418070002000036,
-						-34.68667999799993
+						19.41807,
+						-34.68668
 					],
 					[
-						19.41454999700005,
-						-34.689969995999945
+						19.41455,
+						-34.68997
 					],
 					[
-						19.409929999000042,
-						-34.68798000399994
+						19.40993,
+						-34.68798
 					],
 					[
-						19.418070002000036,
-						-34.68667999799993
+						19.41807,
+						-34.68668
 					]
 				]
 			],
 			[
 				[
 					[
-						19.418799998000054,
-						-34.67816000099998
+						19.4188,
+						-34.67816
 					],
 					[
-						19.423420004000036,
-						-34.68024000099996
+						19.42342,
+						-34.68024
 					],
 					[
-						19.415079998000067,
-						-34.68597999699995
+						19.41508,
+						-34.68598
 					],
 					[
-						19.418799998000054,
-						-34.67816000099998
+						19.4188,
+						-34.67816
 					]
 				]
 			],
 			[
 				[
 					[
-						19.456289997000056,
-						-34.39274000199998
+						19.45629,
+						-34.39274
 					],
 					[
-						19.555989999000076,
-						-34.38973999999996
+						19.55599,
+						-34.38974
 					],
 					[
-						19.68811000100004,
-						-34.765320000999964
+						19.68811,
+						-34.76532
 					],
 					[
-						19.677619999000058,
-						-34.78188000299997
+						19.67762,
+						-34.78188
 					],
 					[
-						19.638179999000045,
-						-34.779159997999955
+						19.63818,
+						-34.77916
 					],
 					[
-						19.594120002000068,
-						-34.73309000399996
+						19.59412,
+						-34.73309
 					],
 					[
-						19.495539999000073,
-						-34.671620004999966
+						19.49554,
+						-34.67162
 					],
 					[
-						19.456289997000056,
-						-34.39274000199998
+						19.45629,
+						-34.39274
 					]
 				]
 			]
diff --git a/packages/turf-simplify/test/out/polygon.geojson b/packages/turf-simplify/test/out/polygon.geojson
index 5c5abc50a5..b6bd7b002e 100644
--- a/packages/turf-simplify/test/out/polygon.geojson
+++ b/packages/turf-simplify/test/out/polygon.geojson
@@ -9,19 +9,19 @@
 		"coordinates": [
 			[
 				[
-					-75.51527029981442,
+					-75.51527,
 					39.11245
 				],
 				[
-					-75.14260248550531,
-					39.87553750000001
+					-75.142602,
+					39.875538
 				],
 				[
-					-75.8130875,
-					39.904921352207175
+					-75.813087,
+					39.904921
 				],
 				[
-					-75.51527029981442,
+					-75.51527,
 					39.11245
 				]
 			]
diff --git a/packages/turf-simplify/test/out/simple-polygon.geojson b/packages/turf-simplify/test/out/simple-polygon.geojson
index deb1d733a9..bcaf956f43 100644
--- a/packages/turf-simplify/test/out/simple-polygon.geojson
+++ b/packages/turf-simplify/test/out/simple-polygon.geojson
@@ -8,20 +8,20 @@
 		"coordinates": [
 			[
 				[
-					26.148429528000065,
-					-28.29755210099995
+					26.14843,
+					-28.297552
 				],
 				[
-					26.150354333000053,
-					-28.30260575099993
+					26.150354,
+					-28.302606
 				],
 				[
-					26.13546315800005,
-					-28.304282678999982
+					26.135463,
+					-28.304283
 				],
 				[
-					26.148429528000065,
-					-28.29755210099995
+					26.14843,
+					-28.297552
 				]
 			]
 		]

From bd2720a1c5b3dcbb43f7497974973fd703f1be3c Mon Sep 17 00:00:00 2001
From: Denis <carriere.denis@gmail.com>
Date: Thu, 17 Aug 2017 16:16:29 -0400
Subject: [PATCH 11/12] Support for null geometries

---
 packages/turf-concave/index.js                |   5 +-
 packages/turf-concave/package.json            |   2 +-
 .../test/in/support-null-geometry.geojson     | 146 ++++++++++
 .../test/out/support-null-geometry.geojson    | 258 ++++++++++++++++++
 4 files changed, 409 insertions(+), 2 deletions(-)
 create mode 100644 packages/turf-concave/test/in/support-null-geometry.geojson
 create mode 100644 packages/turf-concave/test/out/support-null-geometry.geojson

diff --git a/packages/turf-concave/index.js b/packages/turf-concave/index.js
index e209d44352..8c0e358505 100644
--- a/packages/turf-concave/index.js
+++ b/packages/turf-concave/index.js
@@ -2,6 +2,7 @@ var tin = require('@turf/tin');
 var helpers = require('@turf/helpers');
 var distance = require('@turf/distance');
 var dissolve = require('geojson-dissolve');
+var featureEach = require('@turf/meta').featureEach;
 var feature = helpers.feature;
 var featureCollection = helpers.featureCollection;
 
@@ -73,7 +74,9 @@ module.exports = function (points, maxEdge, units) {
 function removeDuplicates(points) {
     var cleaned = [];
     var existing = {};
-    points.features.forEach(function (pt) {
+
+    featureEach(points, function (pt) {
+        if (!pt.geometry) return;
         var key = pt.geometry.coordinates.join('-');
         if (!existing.hasOwnProperty(key)) {
             cleaned.push(pt);
diff --git a/packages/turf-concave/package.json b/packages/turf-concave/package.json
index 3b43063040..20606810cf 100644
--- a/packages/turf-concave/package.json
+++ b/packages/turf-concave/package.json
@@ -40,7 +40,6 @@
   },
   "homepage": "https://github.com/Turfjs/turf",
   "devDependencies": {
-    "@turf/meta": "^4.6.0",
     "benchmark": "^2.1.4",
     "load-json-file": "^2.0.0",
     "tape": "^4.6.3",
@@ -49,6 +48,7 @@
   "dependencies": {
     "@turf/distance": "4.6.0",
     "@turf/helpers": "^4.6.0",
+    "@turf/meta": "^4.6.0",
     "@turf/tin": "4.6.0",
     "geojson-dissolve": "3.1.0"
   }
diff --git a/packages/turf-concave/test/in/support-null-geometry.geojson b/packages/turf-concave/test/in/support-null-geometry.geojson
new file mode 100644
index 0000000000..b2fc921618
--- /dev/null
+++ b/packages/turf-concave/test/in/support-null-geometry.geojson
@@ -0,0 +1,146 @@
+{
+  "type": "FeatureCollection",
+  "properties": {
+    "maxEdge": 5.5,
+    "units": "miles"
+  },
+  "features": [
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": null
+    },
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Point",
+        "coordinates": [
+          -122.43095397949219,
+          37.74411415606583
+        ]
+      }
+    },
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Point",
+        "coordinates": [
+          -122.44331359863283,
+          37.726194088705576
+        ]
+      }
+    },
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Point",
+        "coordinates": [
+          -122.47833251953125,
+          37.73651223296987
+        ]
+      }
+    },
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Point",
+        "coordinates": [
+          -122.4103546142578,
+          37.72184917678752
+        ]
+      }
+    },
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Point",
+        "coordinates": [
+          -122.41790771484375,
+          37.74682893940135
+        ]
+      }
+    },
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Point",
+        "coordinates": [
+          -122.53395080566405,
+          37.83690319650768
+        ]
+      }
+    },
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Point",
+        "coordinates": [
+          -122.51541137695311,
+          37.83473402375478
+        ]
+      }
+    },
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Point",
+        "coordinates": [
+          -122.49069213867188,
+          37.837445479729666
+        ]
+      }
+    },
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Point",
+        "coordinates": [
+          -122.52639770507812,
+          37.83473402375478
+        ]
+      }
+    },
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Point",
+        "coordinates": [
+          -122.62527465820311,
+          37.89327929625019
+        ]
+      }
+    },
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Point",
+        "coordinates": [
+          -122.60467529296875,
+          37.902490518640995
+        ]
+      }
+    },
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Point",
+        "coordinates": [
+          -122.58682250976562,
+          37.895988598965644
+        ]
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/packages/turf-concave/test/out/support-null-geometry.geojson b/packages/turf-concave/test/out/support-null-geometry.geojson
new file mode 100644
index 0000000000..59704fd5a6
--- /dev/null
+++ b/packages/turf-concave/test/out/support-null-geometry.geojson
@@ -0,0 +1,258 @@
+{
+	"type": "FeatureCollection",
+	"features": [
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": null
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.43095397949219,
+					37.74411415606583
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.44331359863283,
+					37.726194088705576
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.47833251953125,
+					37.73651223296987
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.4103546142578,
+					37.72184917678752
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.41790771484375,
+					37.74682893940135
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.53395080566405,
+					37.83690319650768
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.51541137695311,
+					37.83473402375478
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.49069213867188,
+					37.837445479729666
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.52639770507812,
+					37.83473402375478
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.62527465820311,
+					37.89327929625019
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.60467529296875,
+					37.902490518640995
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {
+				"marker-color": "#f0f",
+				"marker-size": "small"
+			},
+			"geometry": {
+				"type": "Point",
+				"coordinates": [
+					-122.58682250976562,
+					37.895988598965644
+				]
+			}
+		},
+		{
+			"type": "Feature",
+			"properties": {},
+			"geometry": {
+				"type": "MultiPolygon",
+				"coordinates": [
+					[
+						[
+							[
+								-122.62527465820311,
+								37.89327929625019
+							],
+							[
+								-122.60467529296875,
+								37.902490518640995
+							],
+							[
+								-122.58682250976562,
+								37.895988598965644
+							],
+							[
+								-122.62527465820311,
+								37.89327929625019
+							]
+						]
+					],
+					[
+						[
+							[
+								-122.52639770507812,
+								37.83473402375478
+							],
+							[
+								-122.53395080566405,
+								37.83690319650768
+							],
+							[
+								-122.51541137695311,
+								37.83473402375478
+							],
+							[
+								-122.52639770507812,
+								37.83473402375478
+							]
+						]
+					],
+					[
+						[
+							[
+								-122.4103546142578,
+								37.72184917678752
+							],
+							[
+								-122.44331359863283,
+								37.726194088705576
+							],
+							[
+								-122.47833251953125,
+								37.73651223296987
+							],
+							[
+								-122.43095397949219,
+								37.74411415606583
+							],
+							[
+								-122.41790771484375,
+								37.74682893940135
+							],
+							[
+								-122.4103546142578,
+								37.72184917678752
+							]
+						]
+					]
+				]
+			}
+		}
+	]
+}

From f41d2023191ba9ccdd26406498f6027d0312f46e Mon Sep 17 00:00:00 2001
From: Denis <carriere.denis@gmail.com>
Date: Thu, 17 Aug 2017 17:36:41 -0400
Subject: [PATCH 12/12] Fix test/out for @turf/simplify

---
 packages/turf-simplify/test/out/argentina.geojson         | 4 ++--
 packages/turf-simplify/test/out/featurecollection.geojson | 3 +++
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/packages/turf-simplify/test/out/argentina.geojson b/packages/turf-simplify/test/out/argentina.geojson
index ff4f48ad8c..642ba65ff5 100644
--- a/packages/turf-simplify/test/out/argentina.geojson
+++ b/packages/turf-simplify/test/out/argentina.geojson
@@ -1,5 +1,6 @@
 {
 	"type": "Feature",
+	"id": "ARG",
 	"properties": {
 		"tolerance": 0.1,
 		"name": "Argentina"
@@ -414,6 +415,5 @@
 				]
 			]
 		]
-	},
-	"id": "ARG"
+	}
 }
diff --git a/packages/turf-simplify/test/out/featurecollection.geojson b/packages/turf-simplify/test/out/featurecollection.geojson
index 1539f80aa5..f391b4428b 100644
--- a/packages/turf-simplify/test/out/featurecollection.geojson
+++ b/packages/turf-simplify/test/out/featurecollection.geojson
@@ -1,5 +1,8 @@
 {
 	"type": "FeatureCollection",
+	"properties": {
+		"tolerance": 0.01
+	},
 	"features": [
 		{
 			"type": "Feature",