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2. Libre Map Project - Wikipedia

   en.wikipedia.org/wiki/Libre_Map_Project

   The Libre Map Project is an online collection of all digital USGS 1:24K scale topographic maps (as well as various other GIS data) covering the United States, available as a free download. History [ edit ]

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. 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

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. 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]

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8. Mare Acidalium quadrangle - Wikipedia

   en.wikipedia.org/wiki/Mare_Acidalium_quadrangle

   The Mare Acidalium quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey (USGS) Astrogeology Research Program. The quadrangle is located in the northeastern portion of Mars' western hemisphere and covers 300° to 360° east longitude (0° to 60° west longitude) and 30° to 65° north latitude.

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