Electrical Resistivity Tomography (ERT) Surveys on the Des Moines River Floodplain, Des Moines, Iowa, 2018
type: Dataset
description: Electrical resistivity tomography (ERT) surveys were collected in summer 2018 to support hydrogeologic characterization of the alluvial aquifer. For this investigation, 7 surveys were conducted with ERT methods. At each site three surveys were collected, including dipole-dipole (DD), Wenner-Schlumberger (WS), and Inverse Schlumberger (SI )configurations. For each survey a total of 56 electrodes spaced 5-meters (m) apart were used. During the ERT measurement, current is injected through two current electrodes and voltage is measured sequentially across multiple pairs of potential electrodes, which is used to determine the apparent resistivity of the subsurface. Results were combined into a merged dataset. ERT surveys can be inverted to obtain resistivity profiles that can be interpreted for subsurface layers. This data release provides only the raw ERT data and the resultant inversion model. This data release contains a notes file for archiving surface-geophysical data (ERT_Archive_Notes_DesMoinesIA.csv), a text file (readme_ERT.txt) explaining the data files and processing references, and a color scale file (ERT_colorscale.png) relating colors to resistivity values. This data release also contains 7 compressed zip folders (one for each survey line) containing the original instrument files (windows command scripts, .crs, and .stg). There is a windows command script, a .crs, and a .stg file for each configuration: dipole-dipole (DD), Wenner-Schlumberger (WS), and Inverse Schlumberger (SI), two .xyz files (raw data culled and inverted data), and inverted model output image for each survey line (.wmf). Field notes taken at the time of data collection are not included in this data release but are available upon request.
issued: 2025-11-20T10:53:24.368651
modified: 20211207
spatial: Location
contact point: Organization
  fn: Emilia L Bristow
keyword: amerigeo
keyword: amerigeoss
keyword: aquifer-characterization
keyword: ckan
keyword: des-moines
keyword: electrical-resistivity-tomography
keyword: geo
keyword: geophysics
keyword: geoss
keyword: hydrogeology
keyword: iowa
keyword: national
keyword: north-america
keyword: polk-county
keyword: united-states
keyword: usgs-6165a9f9d34eb58ff6a15233
theme: {geospatial}

Digital Data
type: Distribution
description: Landing page for access to the data
format: XML
issued: 2022-07-28T19:45:20.433593
modified: 2025-11-20T10:53:24.359703
access URL: https://doi.org/10.5066/P9B9AVKJ
media type: application/http

Original Metadata
type: Distribution
description: The metadata original format
format: XML
issued: 2022-07-28T19:45:20.433586
modified: 2025-11-20T10:53:24.359294
access URL: https://data.usgs.gov/datacatalog/metadata/USGS.6165a9f9d34eb58ff6a15233.xml
media type: text/xml

US Migrating
type: Agent