| 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 |
| MapServer |
|
| USGS | http://basemap.nationalmap.gov/ArcGIS/services/USGSImageryTopo/MapServer/WMSServer | ||
| NOAA |
| http://nowcoast.noaa.gov/help/mapservices.shtml?name=mapservices |