Purpose Regional hydrographic analysis, medium scale basemapping, limnological studies Time Period of Content Date Unknown Currentness Reference DLG Data are automated from the most recent USGS sources available. No specific study has been undertaken to determine the range of dates associated with this particular data set. Some representations may extend back twenty years or more. None Access Constraints None Use Constraints Internal DNR use is unrestricted. Water body coding has demonstrated inconsistencies in the reservoir feature type with some man-made waterbodies being classified as lakes.
All polygons are closed and lines intersect where intended.
Completeness Data exist statewide. Lake data are consistently complete at a minimum feature size of approximately 5 acres with mapping to the 2 acre level present in some areas. DLG data is some of the highest quality federally developed digital geographic data, although it sometimes exhibits coordinate and attribute edgematch problems. The DNR version was originally processed at LMIC, who performed a significant amount of graphic edits to ensure good edgematching. The data were then joined into a statewide coverage and the various quadrangle sheet, watershed, and county boundary features which had been overlayed with the hydrography data were removed.