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From approximately 1947–1992, the USGS produced the 7.5 minute series, with each map covering an area one-quarter of the older 15-minute quad series, which it replaced. [1] A 7.5 minute quadrangle map covers an area of 49 to 70 square miles (130 to 180 km 2). [2]
DOQs produced by the USGS cover an area measuring 7.5-minutes longitude by 7.5-minutes latitude (the same area covered by a USGS 1:24,000-scale topographic map, also known as a 7.5-minute quadrangle) or 3.75-minutes by 3.75-minutes.
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.
Each of these quadrangles covers the area contained within 32 maps in the 7.5-minute series. The 1:100,000 scale series is unusual in that it primarily employs the metric system. One centimeter on the map represents one kilometer of distance on the ground. Contour intervals, spot elevations, and horizontal distances are also specified in meters.
Wetland and peat resource map of the South Merrimack 7.5-minute Quadrangle, New Hampshire: 1989: The geology, botany and chemistry of selected peat-forming environments from temperate and tropical latitudes: 1990: Wetland and peat resource map of part of the Townsend 7.5-minute quadrangle, New Hampshire: 1990
Marshyhope Creek is a 37.0-mile-long (59.5 km) [8] tributary of the Nanticoke River on the Delmarva Peninsula.It rises in Kent County, Delaware, and runs through Caroline County, Maryland, and Dorchester County, Maryland.
An additional 8,245 hard copy maps (quadrangles) were added as raster image files. Currently the Wetlands Geodatabase contains over 34,500 7.5 minute map areas in a seamless ArcSDE geodatabase format.
United States Geological Survey. 7.5 minute series topographic quadrangles; U.S. Geological Survey Geographic Names Information System: Bohemia River; General Highway Map of Cecil County, Maryland, 2005. Prepared in collaboration between Maryland State and United States Federal governments.