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Historical Topographic Maps FAQs - 14 Found

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You state the first release of historical topographic maps for a State as "standard cells," and "nonstandard maps" will be released as part of a second phase. What does this mean?

The USGS topographic maps are best known as "quadrangles." The quadrangle maps normally cover a standard unit of latitude and longitude. An example is the 1:24,000 maps that are 7.5 x 7.5 minutes. Another USGS FAQ provides a complete list of the various scales and geographic extents of USGS quadrangles.

Occasionally maps were prepared and printed to inlcude slightly more than just a quadrangle; for example, to include a State border or a geographic feature (island, peninsula, etc.) that would the map more useful to the reader. The scanning of these "nonstandard" maps requires additional processing, so they are being done in a later, separate process. Nonstandard maps will be available in 2012.

Tags: Maps, Topographic, Recreation, Quadrangle, GeoPDF, Scale