Show all buildings at z16

data/functions.sql

@@ -741,6 +741,11 @@ CREATE OR REPLACE FUNCTION mz_building_filter(
 RETURNS BOOLEAN AS $$
 BEGIN
   RETURN CASE
+    -- if the min area is satisfied, then there's no
+    -- need to check the area.
+    WHEN way_area >= min_area
+      THEN TRUE
+
     -- if height is present, and can be parsed as a
     -- float, then we can filter right here.
     WHEN mz_is_numeric(height)
@@ -757,9 +762,9 @@ BEGIN
     WHEN height IS NOT NULL OR levels IS NOT NULL
       THEN TRUE
 
-    -- height isn't present, so just filter on area
-    -- as we did before.
-    ELSE way_area >= min_area
+    -- height isn't present, and area doesn't satisfy
+    -- the minimum bound, so don't show this building.
+    ELSE FALSE
   END;
 END;
 $$ LANGUAGE plpgsql IMMUTABLE;

queries.yaml

@@ -221,7 +221,6 @@ post_process:
         13: { area: 1600, volume: 300000 }
         14: { area:  100, volume: 200000 }
         15: { area:  100, volume: 100000 }
-        16: { area:   25, volume:  50000 }
   - fn: TileStache.Goodies.VecTiles.transform.intercut
     params:
       base_layer: roads

queries/buildings.jinja2

@@ -29,6 +29,12 @@ SELECT
     "roof:orientation" AS roof_orientation,
     "addr:housenumber" AS addr_housenumber,
     "addr:street" AS addr_street,
+{% if zoom >= 16 %}
+    CASE WHEN mz_building_filter(tags->'building:height', "building:levels", way_area, 50000, 25)
+      THEN 16
+      ELSE 17
+    END AS min_zoom,
+{% endif %}
     %#tags AS tags
 
 FROM
@@ -50,8 +56,6 @@ WHERE
    AND mz_building_filter(tags->'building:height', "building:levels", way_area, 200000,  100)
 {% elif zoom == 15 %}
    AND mz_building_filter(tags->'building:height', "building:levels", way_area, 100000,  100)
-{% elif zoom == 16 %}
-   AND mz_building_filter(tags->'building:height', "building:levels", way_area,  50000,   25)
 {% endif %}
 
     AND {{ bounds|bbox_filter('way') }}
@@ -82,6 +86,9 @@ SELECT
     NULL AS roof_orientation,
     "addr:housenumber" AS addr_housenumber,
     "addr:street" AS addr_street,
+{% if zoom >= 16 %}
+    17 AS min_zoom,
+{% endif %}
     %#tags AS tags
 
 FROM

test/557-missing-buildings.py

@@ -0,0 +1,14 @@
+# Best Tile
+assert_has_feature(
+    16, 10484, 25339, 'buildings',
+    {'id': 103383621})
+
+# Miraloma School
+assert_has_feature(
+    16, 10476, 25339, 'buildings',
+    {'id': 338881092})
+
+# Tiny individual building (way_area = 5.4 sq.m.)
+assert_has_feature(
+    16, 10474, 25343, 'buildings',
+    {'id': 278410540, 'min_zoom': 17})