| Provider | Service type | Usage restrictions | Required attribution | Request URL or template |
|---|---|---|---|---|
| OpenStreetMap | Tiles | Free to use with attribution | © OpenStreetMap contributors | http://{s}.tile.osm.org/{z}/{x}/{y}.png |
| USGS National Map | MapServer |
| USGS | http://basemap.nationalmap.gov/ArcGIS/services/USGSImageryTopo/MapServer/WMSServer |
| NOAA | http://nowcoast.noaa.gov/help/mapservices.shtml?name=mapservices |
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