Because the digitized data set did not identify hydrographic features, this information was added by the DNR Geographic Services Section from the 1:250,000-scale Land Use and Land Cover data layer. Portions of the Wisconsin state boundary were also added to the digitized data set using the 1:100,000-scale state boundary coverage. GEO Services projected the data from the Lambert Conformal Conic Projection to WTM and carried out limited quality control review and edits to assure topological integrity of the data.