Donald LumanGoldsmith, Chris, 1954-Illinois State Geological SurveySmith, Lisa R. (Geologist)A digital elevation model (DEM) in ArcINfo grid format. Data were assembled to provide a statewide database of surface elevation points suitable for analyses of statewide geologic phenomena associated with elevation. ISGS, 2003.Raster Datasethttps://clearinghouse.isgs.illinois.edu/data/elevation/surface-elevation-30-meter-digital-elevation-model-demengIllinois Geospatial Data ClearinghousePublicStatewide 30-Meter Digital Elevation Model [Illinois]Web servicesIllinois2003