This data category requires a high level national map. To satisfy this category, the following minimum criteria must be met:
- Scale of 1:250,000 (1 cm = 2.5km).
- Markings of national roads
- National borders
- Marking of streams, rivers, lakes, mountains.
- Updated at least once a year.
Use The National Map Viewer and Download Platform to visualize, inspect, and download our most current topographic base map data and products for free. Managed by the USGS National Geospatial Program (NGP), the National Map Viewer provides access to all eight primary data themes of The National Map to include US Topo and historical topographic map products. The viewer platform is extended upon the National Geospatial Intelligence Agency's (NGA) Palanterra x3 Viewer. Data include: Elevation, Orthoimagery, Hydrography, Geographic Names, Boundaries, Transportation, Structures, and Land Cover, while products include: US Topo and Historical Topo Maps. The National Map Viewer also allows visualization and identification queries (but not downloads) of Other Featured Data, to include Scanned Topo Maps, Ecosystems, Protected Areas, Gap Analysis Program Land Cover, Wetlands, Public Land Survey System, and National Park Service Boundaries. Also included is a Natural Hazards panel to view hazards-related information, such as for earthquakes, floods, wildfires, and weather, along with the U.S. National Grid for emergency response. Observation: expert review was done on 27th and 28th of November and on both dates the map viewer did not load on Chrome and Firefox.
Expert review: additional research included
- No data
|Date the data became available||Unknown|
|Format of data||shape|
|Last modified||Fri Nov 28 2014 07:21:07 GMT+0000 (UTC)|