GeoData@Wisconsin is an online geoportal that provides discovery and access to Wisconsin geospatial data, imagery, and scanned maps. It is cooperatively maintained by the State Cartographer's Office and the Robinson Map Library at UW–Madison, and is the state's most comprehensive catalog of geospatial data produced by local, state, and regional governments.
Coverage includes parcels, the Public Land Survey System, municipal and political boundaries, transportation, environment, aerial imagery, and elevation. All data referenced in the catalog is available to download for free.