fix(lambda-tiler): correct mapping of high zoom levels (#1492)

#1492
linz · Mar 11, 2021 · 7e98e63 · 7e98e63
1 parent d27d9c5
commit 7e98e63
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Showing 2 changed files with 8 additions and 1 deletion.
diff --git a/packages/lambda-tiler/src/__test__/tile.set.test.ts b/packages/lambda-tiler/src/__test__/tile.set.test.ts
@@ -24,6 +24,13 @@ o.spec('tile.set', () => {
         }
     });
 
+    o('should match zoom levels outside of the range of the target z', () => {
+        const ts = new TileSet('Nztm2000Quad', Nztm2000QuadTms);
+        o(ts.getDefaultZoomLevel(22)).equals(16);
+        o(ts.getDefaultZoomLevel(21)).equals(16);
+        o(ts.getDefaultZoomLevel(20)).equals(16);
+    });
+
     o('should match the zoom levels from nztm2000 when using nztm2000quad', () => {
         const ts = new TileSet('Nztm2000Quad', Nztm2000QuadTms);
         o(ts.getDefaultZoomLevel(13)).equals(11);

diff --git a/packages/lambda-tiler/src/tile.set.ts b/packages/lambda-tiler/src/tile.set.ts
@@ -118,7 +118,7 @@ export class TileSet {
         const defaultMatrix = TileMatrixSets.get(this.tileMatrix.projection);
 
         if (defaultMatrix.identifier === this.tileMatrix.identifier) return z;
-        if (z > defaultMatrix.maxZoom) return z;
+        if (z >= this.tileMatrix.maxZoom) z = this.tileMatrix.maxZoom;
 
         return defaultMatrix.findBestZoom(this.tileMatrix.zooms[z].scaleDenominator);
     }