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This polygon feature class represents surface water features (hydrography) in Wisconsin. The data are derived from the U.S. Geological Survey's Digital Line Graphs (DLGs) at 1:2,000,000 scale. Feature representation (i.e., whether a river is represented by a line or a polygon) is determined primarily by how the corresponding entity is symbolized on the USGS source maps. Depending on the source map symbolization, portions of a river may be represented by either single-or double-line features, and other portions as polygons, such as when a river widens to form a lake. For more informaiton, see: ftp://dnrftp01.wi.gov/geodata/metadata/open_water_2m.pdf. |