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Beginning in 2009, the USGS made available digital versions of 7.5 minute quadrangle maps based on GIS data that use the NAD83 datum, which is typically within one meter of WGS84, or within the uncertainty of most GPS coordinate measurements. The USGS also produces quarter quadrangle (QQ) maps of areas 3.75 minutes square. [3] [4] [5]
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.
Date/Time Thumbnail Dimensions User Comment; current: 20:09, 21 March 2023: 584 × 1,426 (640 KB): Jengod: Uploaded a work by USGS from USGS 7.5-minute image map for Point Arguello, California Point Pedernales ...
The USGS DEM standard is a geospatial file format developed by the United ... map series up to 1:100000 ... of information from printed source maps Level 3 7.5-minute ...
Each map was bounded by two parallels and two meridians spaced 15 minutes apart—the same area covered by four maps in the 7.5-minute series. The 15-minute series, at a scale of 1:63,360 (one inch representing one mile), remains the primary topographic quadrangle for the state of Alaska (and only for that particular state).
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.
The National Map is a significant contribution to the U.S. National Spatial Data Infrastructure (NSDI) from the Federal Geographic Data Committee (FGDC) and currently is being transformed to better serve the geospatial community by providing high quality, integrated geospatial data and improved products and services including new generation ...
File:USGS US Topo 7.5-minute map for Grand Rapids West, MI 2014 (cropped).jpg. Add languages. Page contents not supported in other languages. File; Talk; English.