Significant Topographic Changes in the United States
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Quadrangle Base Maps
Many resource managers and geospatial data users are familiar with the USGS 7.5-minute quadrangle map series. Also, much of the geospatial data managed by the USGS was originally produced in tiles corresponding to the 7.5-minute maps. The topographic map quadrangles are still commonly used as base maps for outlining data collection strategies and defining project boundaries. Thus, it is useful to characterize the extent of the topographic change inventory in terms of the footprints of the 7.5-minute map series.
The figure below shows the 7.5-minute quadrangles within the conterminous United States that contain topographic change polygons.
USGS 7.5-minute quadrangle maps that contain topographic change polygons. A total of 2,454 quadrangles contain change polygons, which represents over 4.5 percent of the quadrangles in the conterminous United States.
Summary Statistics and Rankings:
Top Ranked Quadrangles (by Percentage) Containing Topographic Change Polygons
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://topochange.usgs.gov/basemaps.php
Page Contact Information: custserv@usgs.gov
Page Last Modified: September 08, 2008
