fix: Support TileLayer refinement strategies

packages/deck.gl-geotiff/src/cog-layer.ts

@@ -16,6 +16,7 @@ import { PathLayer } from "@deck.gl/layers";
 import type {
   RasterLayerProps,
   RasterModule,
+  TileMetadata,
 } from "@developmentseed/deck.gl-raster";
 import {
   RasterLayer,
@@ -407,7 +408,12 @@ export class COGLayer<
     inverseFrom3857: ReprojectionFns["inverseReproject"],
   ): Layer | LayersList | null {
     const { maxError, debug, debugOpacity } = this.props;
-    const { tile } = props;
+
+    // Cast to include TileMetadata from raster-tileset's `getTileMetadata`
+    // method.
+    // TODO: implement generic handling of tile metadata upstream in TileLayer
+    const tile = props.tile as Tile2DHeader<GetTileDataResult<DataT>> &
+      TileMetadata;
 
     if (!props.data) {
       return null;
@@ -495,35 +501,34 @@ export class COGLayer<
     }
 
     if (debug) {
-      // Get projected bounds from tile data
-      // getTileMetadata returns data that includes projectedBounds
-      // eslint-disable-next-line @typescript-eslint/no-explicit-any
-      const projectedBounds: {
-        topLeft: [number, number];
-        topRight: [number, number];
-        bottomLeft: [number, number];
-        bottomRight: [number, number];
-      } = (tile as any)?.projectedBounds;
-
-      if (!projectedBounds || !tms) {
+      const { projectedCorners } = tile;
+
+      if (!projectedCorners || !tms) {
         return [];
       }
 
-      // Project bounds from image CRS to WGS84
-      const { topLeft, topRight, bottomLeft, bottomRight } = projectedBounds;
-
+      // Create a closed path in WGS84 projection around the tile bounds
+      //
+      // The tile has a `bbox` field which is already the bounding box in WGS84,
+      // but that uses `transformBounds` and densifies edges. So the corners of
+      // the bounding boxes don't line up with each other.
+      //
+      // In this case in the debug mode, it looks better if we ignore the actual
+      // non-linearities of the edges and just draw a box connecting the
+      // reprojected corners. In any case, the _image itself_ will be densified
+      // on the edges as a feature of the mesh generation.
+      const { topLeft, topRight, bottomRight, bottomLeft } = projectedCorners;
       const topLeftWgs84 = forwardTo4326(topLeft[0], topLeft[1]);
       const topRightWgs84 = forwardTo4326(topRight[0], topRight[1]);
       const bottomRightWgs84 = forwardTo4326(bottomRight[0], bottomRight[1]);
       const bottomLeftWgs84 = forwardTo4326(bottomLeft[0], bottomLeft[1]);
 
-      // Create a closed path around the tile bounds
       const path = [
         topLeftWgs84,
         topRightWgs84,
         bottomRightWgs84,
         bottomLeftWgs84,
-        topLeftWgs84, // Close the path
+        topLeftWgs84,
       ];
 
       layers.push(

packages/deck.gl-raster/package.json

@@ -62,6 +62,7 @@
   "dependencies": {
     "@developmentseed/affine": "workspace:^",
     "@developmentseed/morecantile": "workspace:^",
+    "@developmentseed/proj": "workspace:^",
     "@developmentseed/raster-reproject": "workspace:^",
     "@math.gl/core": "^4.1.0",
     "@math.gl/culling": "^4.1.0",

packages/deck.gl-raster/src/index.ts

@@ -1,6 +1,7 @@
 export type { RasterModule } from "./gpu-modules/types.js";
 export type { RasterLayerProps } from "./raster-layer.js";
 export { RasterLayer } from "./raster-layer.js";
+export type { TileMetadata } from "./raster-tileset/index.js";
 export { TileMatrixSetTileset } from "./raster-tileset/index.js";
 
 import { __TEST_EXPORTS as traversalTestExports } from "./raster-tileset/raster-tile-traversal.js";

packages/deck.gl-raster/src/raster-tileset/index.ts

@@ -1 +1,2 @@
+export type { TileMetadata } from "./raster-tileset-2d.js";
 export { TileMatrixSetTileset } from "./raster-tileset-2d.js";

packages/deck.gl-raster/src/raster-tileset/raster-tileset-2d.ts

@@ -6,23 +6,77 @@
  */
 
 import type { Viewport } from "@deck.gl/core";
-import type { _Tileset2DProps as Tileset2DProps } from "@deck.gl/geo-layers";
+import type {
+  GeoBoundingBox,
+  _Tileset2DProps as Tileset2DProps,
+} from "@deck.gl/geo-layers";
 import { _Tileset2D as Tileset2D } from "@deck.gl/geo-layers";
 import * as affine from "@developmentseed/affine";
-import type { BoundingBox, TileMatrixSet } from "@developmentseed/morecantile";
+import type {
+  BoundingBox,
+  TileMatrix,
+  TileMatrixSet,
+} from "@developmentseed/morecantile";
 import { tileTransform } from "@developmentseed/morecantile";
+import { transformBounds } from "@developmentseed/proj";
 import type { Matrix4 } from "@math.gl/core";
-
 import { getTileIndices } from "./raster-tile-traversal";
 import type {
   Bounds,
   CornerBounds,
   Point,
+  ProjectedBoundingBox,
   ProjectionFunction,
   TileIndex,
   ZRange,
 } from "./types";
 
+/** Type returned by `getTileMetadata` */
+export type TileMetadata = {
+  /**
+   * **Axis-aligned** bounding box of the tile in **WGS84 coordinates**.
+   */
+  bbox: GeoBoundingBox;
+
+  /**
+   * **Axis-aligned** bounding box of the tile in **projected coordinates**.
+   */
+  projectedBbox: ProjectedBoundingBox;
+
+  /**
+   * "Rotated" bounding box of the tile in **projected coordinates**,
+   * represented as four corners.
+   *
+   * This preserves rotation/skew information that would be lost in the
+   * axis-aligned bbox.
+   */
+  projectedCorners: {
+    topLeft: Point;
+    topRight: Point;
+    bottomLeft: Point;
+    bottomRight: Point;
+  };
+
+  /**
+   * Tile width in pixels.
+   *
+   * Note this may differ between levels in some TileMatrixSets.
+   */
+  tileWidth: number;
+
+  /**
+   * Tile height in pixels.
+   *
+   * Note this may differ between levels in some TileMatrixSets.
+   */
+  tileHeight: number;
+
+  /**
+   * A reference to the underlying TileMatrix.
+   */
+  tileMatrix: TileMatrix;
+};
+
 /**
  * A generic tileset implementation organized according to the OGC
  * [TileMatrixSet](https://docs.ogc.org/is/17-083r4/17-083r4.html)
@@ -109,11 +163,25 @@ export class TileMatrixSetTileset extends Tileset2D {
     const currentOverview = this.tms.tileMatrices[index.z]!;
     const parentOverview = this.tms.tileMatrices[index.z - 1]!;
 
-    const decimation = currentOverview.cellSize / parentOverview.cellSize;
+    // Decimation is the number of child tiles that fit across one parent tile.
+    // Must use tile footprint (cellSize × tileWidth/Height), not cellSize alone,
+    // because tileWidth can change between levels (e.g. the last Sentinel-2
+    // overview doubles tileWidth while halving cellSize, giving a 1:1 spatial
+    // mapping where decimation = 1).
+    const parentFootprintX = parentOverview.cellSize * parentOverview.tileWidth;
+    const parentFootprintY =
+      parentOverview.cellSize * parentOverview.tileHeight;
+    const currentFootprintX =
+      currentOverview.cellSize * currentOverview.tileWidth;
+    const currentFootprintY =
+      currentOverview.cellSize * currentOverview.tileHeight;
+
+    const decimationX = parentFootprintX / currentFootprintX;
+    const decimationY = parentFootprintY / currentFootprintY;
 
     return {
-      x: Math.floor(index.x / decimation),
-      y: Math.floor(index.y / decimation),
+      x: Math.floor(index.x / decimationX),
+      y: Math.floor(index.y / decimationY),
       z: index.z - 1,
     };
   }
@@ -122,7 +190,7 @@ export class TileMatrixSetTileset extends Tileset2D {
     return index.z;
   }
 
-  override getTileMetadata(index: TileIndex): Record<string, unknown> {
+  override getTileMetadata(index: TileIndex): TileMetadata {
     const { x, y, z } = index;
     const { tileMatrices } = this.tms;
     const tileMatrix = tileMatrices[z]!;
@@ -138,24 +206,44 @@ export class TileMatrixSetTileset extends Tileset2D {
 
     // Return the projected bounds as four corners
     // This preserves rotation/skew information
-    const projectedBounds = {
+    const projectedCorners = {
       topLeft,
       topRight,
       bottomLeft,
       bottomRight,
     };
 
     // Also compute axis-aligned bounding box for compatibility
-    const bounds: Bounds = [
+    const projectedBounds: Bounds = [
       Math.min(topLeft[0], topRight[0], bottomLeft[0], bottomRight[0]),
       Math.min(topLeft[1], topRight[1], bottomLeft[1], bottomRight[1]),
       Math.max(topLeft[0], topRight[0], bottomLeft[0], bottomRight[0]),
       Math.max(topLeft[1], topRight[1], bottomLeft[1], bottomRight[1]),
     ];
 
+    // deck.gl's Tile2DHeader uses `bbox` (GeoBoundingBox) for screen-space
+    // culling in filterSubLayer → isTileVisible. Without this, all tiles
+    // would pass (or fail) the cull-rect test and the refinementStrategy
+    // (best-available) would not show parent tiles correctly.
+    const [west, south, east, north] = transformBounds(
+      this.projectTo4326,
+      ...projectedBounds,
+    );
+
     return {
-      bounds,
-      projectedBounds,
+      bbox: {
+        west,
+        south,
+        east,
+        north,
+      },
+      projectedBbox: {
+        left: projectedBounds[0],
+        bottom: projectedBounds[1],
+        right: projectedBounds[2],
+        top: projectedBounds[3],
+      },
+      projectedCorners,
       tileWidth,
       tileHeight,
       tileMatrix,

packages/deck.gl-raster/src/raster-tileset/types.ts

@@ -8,14 +8,15 @@ export type GeoBoundingBox = {
   east: number;
   south: number;
 };
-export type NonGeoBoundingBox = {
+
+export type ProjectedBoundingBox = {
   left: number;
   top: number;
   right: number;
   bottom: number;
 };
 
-export type TileBoundingBox = NonGeoBoundingBox | GeoBoundingBox;
+export type TileBoundingBox = ProjectedBoundingBox | GeoBoundingBox;
 
 export type TileLoadProps = {
   index: TileIndex;