Illinois Height Modernization: Digital Elevation Data

Historically, Digital Elevation Model (DEM) data for Illinois have mainly been based on 5- to 10-foot contour data. Large-scale, digital topographic maps are most common; many data resources contain elevation information acquired in the 1920s and 1930s. DEM data collections are now being developed based on data with a resolution of 2 feet to 6 inches. A comparison between older data and newer high-resolution data shows remarkable improvement in recorded detail.


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