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fix: Clamp to Web Mercator latitude bounds #182

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fix: Clamp to Web Mercator latitude bounds #182

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14 changes: 12 additions & 2 deletions packages/deck.gl-raster/src/raster-tileset/raster-tile-traversal.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -556,8 +556,18 @@ function sampleReferencePointsInEPSG3857(
const geoY = minY + relY * (maxY - minY);

// Reproject to Web Mercator (EPSG 3857)
const projected = projectTo3857([geoX, geoY]);
refPointPositions.push(projected);
const [projectedX, projectedY] = projectTo3857([geoX, geoY]);

// Handle invalid projections (e.g., latitudes beyond ±85.05° produce NaN/Infinity)
// Clamp Y to valid Web Mercator bounds in EPSG:3857 meters
//
// Note that whenever a NaN is created from a positive geoY, that this must
// be the north pole. And vice versa for negative geoY.
const clampedY = Number.isFinite(projectedY)
? projectedY
: Math.sign(geoY) * EPSG_3857_HALF_CIRCUMFERENCE;

refPointPositions.push([projectedX, clampedY]);
}

return refPointPositions;
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