• Surficial Geology of Iowa

    Raster of the surficial geology of Iowa based on the parent material interpretations of the US Soil Survey. The map is built from delineations made at a 1:15,840 scale, then converted to a 10 m resolution grid. This data set is based on the spatial information in the USDA-NRCS gSSURGO database and soil series characteristics described in the official soil series descriptions (OSD).

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  • Comparison of surficial geology maps based on soil survey and in depth geological survey

    Despite the widespread availability of relatively detailed soil maps in the USA, few areas have a surficial geology map published with as much spatial detail. This apparent gap between disciplines calls to question the accuracy of soil maps to represent the spatial distribution of surficial geologic materials. Therefore, the purpose of this research was to test the agreement between maps from these two sources.

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  • Physiography of the Des Moines Lobe

    This GIS package contains a pair of spatial data sets that have been generated for the purpose of studying the physiography of the Des Moines Lobe landform region. Includes a 10 m resolution grid interpreting the surficial geology from gSSURGO. Also includes a polygon shapefile that delineates the Des Moines Lobe into physiographic regions based on that surficial geology map and relief.

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  • Using soil surveys to map Quaternary parent materials and landforms

    The integration of soil survey maps with Geographic Information Systems (GIS) allows for an almost infinite level of collaboration across disciplines that use information related to soil databases. This study created a Quaternary geologic map by categorizing soil descriptions into a geologic context and joining the attributes with the Soil Survey Geographic (SSURGO) database in ArcGIS®. The resulting map communicates many of the spatial intricacies of the Des Moines Lobe landform with 15 map units based on geologic units.

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