All maps are georeferenced to the North American Datum of 1983 (NAD 83) or to the World Geodetic System of 1984 (WGS 84) and projected to the Universal Transverse Mercator (UTM) projection and coordinate system.Shaded relief (derived from 3DEP elevation data where available) and high-resolution color imagery.3-year production cycle for the 48 conterminous states, Hawaii, & Puerto Rico (Alaska US Topo refresh driven by elevation and hydrography data updates).They are classified in four categories: main, widget and panel, state, and icon. These classes are designed to create visual consistency across the app and allow the app to use themes. Virgin Islands, and Alaska (completed 2021) The CSS classes provided by Web AppBuilder are listed below. Consistent and complete coverage of the Nation, including Hawaii, Puerto Rico, the U.S.Portrays both natural and human-made features within the themes of elevation, hydrography, place names, transportation, boundaries, structures, & land cover.Standardized layout of map collar and traditional reference system (latitude/longitude & U.S.Same extents as the popular 7.5-minute, 1:24,000-scale* quadrangle maps released 1947 - 2006 *scale varies in Alaska & Puerto Rico.
Characteristics Common to US Topo and Traditional USGS Topographic Maps The three-year production cycle of the US Topo program. Please visit The National Map Viewer with the US Topo Availability service enabled to view exact publish dates and access the latest US Topos.
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