The National Map is managed by the USGS’ National Geospatial Program in coordination with federal, state, and local partners and may be accessed through data download, web map services, and an online viewer. US Topo maps and scans of historic USGS topographic maps are also available as a part of The National Map.ĭata and products from The National Map can be used by government, industry, academia, as well as the public, in support of geologic mapping, natural hazard planning, natural resource conservation, emergency management, recreation, and many, many other applications. A raster map consists of a matrix of pixels organized into a grid, where each pixel contains a value representing spatial information. The National Map also serves as the data source for modern USGS topographic maps such as US Topos and OnDemand Topos. The National Map also serves as the data source for modern USGS topographic maps such as US Topos and OnDemand Topos. In addition, The National Map provides continuously-updated, seamless datasets for recreational trails, roads, boundaries, structures, land cover, and imagery. In addition, The National Map provides continuously-updated, seamless datasets for recreational trails, roads, boundaries, structures, land cover, and imagery. Map layers can be customized by colors, line thicknesses, transparencies, labels, and other.

Set up your workspace before starting the tutorial. This structure for DEMs and DRGs is especially helpful when tiling, by enabling selection of all needed les within a folder and its subfolders. Contour Lines, spot elevations, coastlines and bodies of water from the raster image are extracted, converted to digital vectors and given elevation values. In July, Esri’s raster basemaps will enter mature support meaning they will no longer be updated. Included in The National Map are the latest elevation data from the 3D Elevation Program (3DEP), surface water data from the National Hydrography Datasets (NHD), and place name data from the Geographic Names Information System (GNIS). c:workDEM, and topographic DRGs in c:workTopo. Announcements ApRobert Jensen To avoid disruption, please begin converting your existing maps and apps built with raster basemaps to vector basemaps before July 2021. The National Map is a collection of free, nationally-consistent geographic datasets that describe the landscape of the United States and its territories.

The National Map Downloader web interface.

Raster topographic maps