fix: cap USGS maxZoom at 16 to match tile server capability - #709
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The USGS national map tile endpoints (USGSTopo, USGSImageryOnly, USGSImageryTopo) return 404 above zoom level 16. Verified on 2026-09-17: zooms 8-16 return HTTP 200 while 17 and above return HTTP 404 for all three services, so the previous maxZoom of 20 produced missing-map areas for users who zoom past 16. Fixes leaflet-extras#570
This was referenced Sep 17, 2026
brunob
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Sep 24, 2026
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Thx for this one :) |
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Fixes #570
Freshly verified against the live tile servers on 2026-09-17 (CONUS center,
basemap.nationalmap.gov):Two findings versus the issue thread:
maxZoom: 20for all three USGS variants. Users panning at zoom 17+ get empty grey areas.This PR sets the shared parent
maxZoom: 16, which covers all three variants (USTopo,USImagery,USImageryTopo) since they inherit it.Note: if you would rather keep zooming closer with upscaled tiles, Leaflet's
maxNativeZoom: 16would do that — I kept it plainmaxZoombecause the file doesn't usemaxNativeZoomanywhere today. Happy to switch if preferred.