2009 Portland GSA Annual Meeting (18-21 October 2009)

Paper No. 60
Presentation Time: 9:00 AM-6:00 PM


WAHL, Ronald R., U.S. Geological Survey, P.O. Box 25046 Mail Stop 980, Denver, CO 80225 and BLOME, Charles D., U.S. Geological Survey, MS 980, Denver, CO 80225, rwahl@usgs.gov

To support hydrogeologic studies of the Arbuckle-Simpson aquifer system, we digitized two geologic maps of the area: one 1:72,000-scale map from 1954 and one 1:100,000-scale map from 1990. The geologic maps were compiled together at 1:100,000 scale and attributed using ArcGIS ver. 9.2 from ESRI. Differences between the two maps were and are being resolved by using available imagery that includes: ASTER, LandSat7 ETM+, a 1-second DEM, and NAIP2008 digital photography alone and in combination before and during ground truthing by means of surficial field mapping. Map topology was built and maintained in an ArcGIS geodatabase. Custom styles were assigned for map units of point, line and area geometries, and the new standards for styles were used for faults and contacts. A digital publication-quality map using ArcMAP presents the geologic data including a shaded relief 1-second SRTM DEM, version 4 that shows topographic shapes associated with the geology. The hydrography was developed from NAIP2008 imagery and generalized for use at the 1:100,000 scale. The map and database will be published by the end of 2009. The final geodatabase and resulting maps will provide the surface geology layer in future 3-D EarthVision™ and geophysical models as well as groundwater flow models of the Arbuckle-Simpson aquifer.