- US National Map Data
- USGS Imagery Only
https://basemap.nationalmap.gov/arcgis/rest/services/USGSImageryOnly/MapServer/tile/{z}/{y}/{x}
- USGS Imagery+Topo
https://basemap.nationalmap.gov/arcgis/rest/services/USGSImageryTopo/MapServer/tile/{z}/{y}/{x}
- USGS Imagery+Hydro
https://basemap.nationalmap.gov/arcgis/rest/services/USGSHydroCached/MapServer/tile/{z}/{y}/{x}
- USGS Shaded Relief Terrain
https://basemap.nationalmap.gov/arcgis/rest/services/USGSShadedReliefOnly/MapServer/tile/{z}/{y}/{x}
- USGS Blank Basemap
https://basemap.nationalmap.gov/arcgis/rest/services/USGSTNMBlank/MapServer/tile/{z}/{y}/{x}
- USGS Topo
https://basemap.nationalmap.gov/arcgis/rest/services/USGSTopo/MapServer/tile/{z}/{y}/{x}
- The OpenStreetMap family of data
- USFS FSTopo
https://apps.fs.usda.gov/arcx/rest/services/EDW/EDW_FSTopo_01/MapServer/tile/{z}/{y}/{x}
- FAA Sectionals
- GeoTIFF, GeoPDF, no processing needed
- LANDSAT Data
- Raw pixel data in GeoTIFF, needs processing to turn into pretty pictures
- USGS EarthExplorer - needs free account
- AWS S3 - requires payment
- USGS Topo Maps
- USFS Topo Maps
- DTED/DEM Terrain Data
- NASA Blue Marble
- JPEG in equidistant rectangular