The National Map
The National Map provides viewers, downloads, web services, current and historical topographic maps, and foundational geospatial layers for the United States and its territories.
Limitations: Its many products and formats can be technical. Data resolution and update frequency vary, and the map should not replace authoritative local boundary, parcel, or hazard information.
Why it is useful
The National Map provides viewers, downloads, web services, current and historical topographic maps, and foundational geospatial layers for the United States and its territories. This resource is especially useful for U.S. topography, elevation, hydrography, imagery, and downloadable data. Review the current instructions and limitations from U.S. Geological Survey before relying on it for important work.
Limitations
Its many products and formats can be technical. Data resolution and update frequency vary, and the map should not replace authoritative local boundary, parcel, or hazard information.