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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 ...
Author: Pease, M.H., Jr., and Monroe, W.H. Image title: Geologic map of the San Juan quadrangle, Puerto Rico; Short title: USGS Miscellaneous Investigations Series ...
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]
A geologist at Brown University conducted his own surveys beginning in 1909 and the state was included in a combined geologic map with Massachusetts in 1917. The US Geological Survey and independent geological researchers began the formal process of mapping Rhode Island's bedrock geology, carrying out quadrangle mapping between 1944 and 1971.
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]
Dibblee was one of the most prolific field geologists in American history, and over a 60-year career of field mapping, including 25 years with the US Geological Survey, left a legacy of 40,000 square miles (100,000 km 2) of geologic maps, covering approximately one fourth of the state of California.
(Click to zoom) See legend below This is the legend for the North American geological map above. Geologic map of North America. The geology of North America is a subject of regional geology and covers the North American continent, the third-largest in the world. Geologic units and processes are investigated on a large scale to reach a ...
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