![]() The USGS Store website offers map downloads and sells prints of map files, including USGS maps and publications that are not included in either the US Topo series or HTMC. The topoView application provides a visual overview of the HTMC and serves maps in additional formats. The National Map Download Client is the primary portal for finding and downloading maps and other data products of the USGS National Geospatial Program. Today, the HTMC contains over 185,000 high-resolution, georeferenced digital files, with accompanying metadata, representing these legacy maps. Many of these maps are no longer available for distribution in print. Contours are imag-inary lines that join points of equal elevation on the surface of the land above or below a reference surface, such as mean sea level. The distinctive character-istic of a topographic map is that the shape of the Earth’s surface is shown by contour lines. In 2011, the USGS National Geospatial Program began publishing scans of 1:250,000-scale and larger topographic maps printed between 1884, the inception of the topographic mapping program, and 2006, when the final maps created using traditional cartographic methods and lithographic printing processes were published. mapis a representation of the Earth, or part of it. Geological Survey (USGS) printed topographic maps that is easily discovered, browsed, and downloaded by the public at no cost. The Historical Topographic Map Collection, or HTMC, provides a comprehensive digital repository of all scales and all editions of U.S. ![]()
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