Electrical resistivity tomography (ERT) data collected March 14–18, 2022 and November 17–21, 2025, north of Sioux Falls, South Dakota

The U.S. Geological Survey, in cooperation with the City of Sioux Falls, South Dakota, performed electrical resistivity tomography (ERT) surveys March 14–18, 2022 and November 17–21, 2025. In total, ERT data were collected along 22 transects using 2 passive cables and electrodes spacings of either 2, 3, or 4 meters. Transect lengths varied from 110 to 220 meters. Real time kinematic (RTK) surveys were completed before ERT data collection to obtain latitude, longitude, and elevation of each electrode location. Elevation data collected during RTK surveys were uploaded to EarthImager2D software from Advanced Geosciences, Inc. (https://www.agiusa.com/agi-earthimager-2d) along with apparent resistivity data for inversion. EarthImager2D software allows users to remove noisy measurements either automatically or manually and invert apparent resistivity data to generate two-dimensional profiles of electrical resistivity. Inverted resistivity profiles were generated for all 22 transects. The unprocessed and processed data for each transect are provided as zipped folders (.zip) and annotated accordingly in the metadata. RTK data are provided in a comma separated values (.csv) file.