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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 ...
Topographic maps are also commonly called contour maps or topo maps. In the United States, where the primary national series is organized by a strict 7.5-minute grid, they are often called or quads or quadrangles. Topographic maps conventionally show topography, or land contours, by means of contour lines.
Map of Mars showing the 30 quadrangles. The surface of Mars has been divided into thirty cartographic quadrangles by the United States Geological Survey.Each quadrangle is a region covering a specified range of latitudes and longitudes on the Martian surface.
A geologic map or geological map is a special-purpose map made to show various geological features. Rock units or geologic strata are shown by color or symbols. Bedding planes and structural features such as faults , folds , are shown with strike and dip or trend and plunge symbols which give three-dimensional orientations features.
Therefore, the south polar geologic map reflects mostly large-scale processes and topographic information, whereas other mercurian quadrangle maps benefit from greater albedo discrimination and, in some cases, higher resolution. The imaged part of the Bach region covers about 1,570,000 km 2.
"Geologic Map Of The Tolstoj (H-8) Quadrangle Of Mercury" (PDF). Prepared for the National Aeronautics and Space Administration by U.S. Department of the Interior, U.S. Geological Survey. Published in hardcopy as USGS Miscellaneous Investigations Series Map I–1199, as part of the Atlas of Mercury, 1:5,000,000 Geologic Series.
The Borealis quadrangle is a quadrangle on Mercury surrounding the north pole down to 65° latitude. ... "Geologic Map of the Borealis Region (H-1) of Mercury" (PDF).
"Geologic Map Of The Michaelangelo (H-12) Quadrangle Of Mercury" (PDF). Prepared for the National Aeronautics and Space Administration by the U.S. Department of the Interior, U.S. Geological Survey. Published in hardcopy as USGS Miscellaneous Investigations Series Map I–1659, as part of the Atlas of Mercury, 1:5,000,000 Geologic Series.