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2. Libre Map Project - Wikipedia

   en.wikipedia.org/wiki/Libre_Map_Project

   The Libre Map Project was started by Jared Benedict and around 100 additional individuals contributing money to purchase (or "liberate") a full set of 1:24K scale USGS topographic maps in Digital raster graphic form. [1] The map files were then hosted by archive.org to ensure the map data will continue to be freely available to everyone ...

3. Quadrangle (geography) - Wikipedia

   en.wikipedia.org/wiki/Quadrangle_(geography)

   A "quadrangle" is a topographic map produced by the United States Geological Survey (USGS) covering the United States. The maps are usually named after local physiographic features. The shorthand "quad" is also used, especially with the name of the map; for example, "the Ranger Creek, Texas quad". A quadrangle is defined by north and south ...

4. GeoPDF - Wikipedia

   en.wikipedia.org/wiki/GeoPDF

   GeoPDF products are used to deliver maps and imagery from multiple US government agencies. Quadrangles of The National Map are available from the USGS store in as GeoPDF products and are free to download. The US Army Corps of Engineers distributes GeoPDF maps through the U.S. Army Corps of Engineers Topographic Engineering Center.

5. United States Geological Survey - Wikipedia

   en.wikipedia.org/wiki/United_States_Geological...

   Today's U.S. Topo quadrangle (1:24,000) maps are mass-produced, using automated and semiautomated processes, with cartographic content supplied from the National GIS Database. [33] In the two years from June 2009 to May 2011, the USGS produced nearly 40,000 maps, more than 80 maps per work day. [33]

6. Ord Mountains (south of Apple Valley, California) - Wikipedia

   en.wikipedia.org/wiki/Ord_Mountains_(south_of...

   The mountains are labelled on the south end of the Apple Valley South USGS quadrangle map, and the north end of the Lake Arrowhead quadrangle. The high point is 4951 feet, at 34°23′24.6″N 117°11′34.2″E  /  34.390167°N 117.192833°E  / 34.390167; 117.192833

7. Digital orthophoto quadrangle - Wikipedia

   en.wikipedia.org/wiki/Digital_orthophoto_quadrangle

   A digital orthophoto quadrangle [1] (DOQ) is aerial photography or satellite imagery that has been corrected so that its pixels are aligned with longitude and latitude lines, and have a narrowly defined region of coverage. This is a widely used format introduced by United States Geological Survey (USGS). [1]