Elevation Control Points to reinterpret the base of aquifer contours after airborne electromagnetic (AEM) surveys of the principal aquifer for portions of the North Platte, South Platte, and Twin Platte Natural Resources Districts, western Nebraska

Metadata Updated: November 12, 2020

The U.S. Geological Survey and its partners have collaborated to complete airborne geophysical surveys for areas of the North and South Platte River valleys and Lodgepole Creek in western Nebraska. The objective of the surveys was to map the aquifers and bedrock topography of selected areas to help improve the understanding of groundwater-surface-water relationships to be used in water management decisions. Frequency-domain (2008 and 2009) and time-domain (2010) helicopter electromagnetic surveys were completed, using a unique survey flight line design, to collect resistivity data that can be related to lithologic information for refinement of groundwater model inputs. To make the geophysical data useful to multidimensional groundwater models, numerical inversion is necessary to convert the measured data into a depth-dependent subsurface resistivity model. This inversion model, in conjunction with sensitivity analysis, geological ground truth (boreholes), and geological interpretation, is used to characterize hydrogeologic features. The two- and three- dimensional interpretation provides the groundwater modeler with a high- resolution hydrogeologic framework and a quantitative estimate of framework uncertainty. This method of creating hydrogeologic frameworks improved the understanding of the actual flow path orientation by redefining the location of the paleochannels and associated bedrock highs. The improved models represent the hydrogeology at a level of accuracy not achievable using previous data sets.

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License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Date May 27, 2011
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) September 30, 2014 (publication)
Frequency Of Update notPlanned

Metadata Source

Harvested from DOI Open Data

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Illustration of data set

Additional Metadata

Resource Type Dataset
Metadata Date May 27, 2011
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) September 30, 2014 (publication)
Responsible Party U.S. Geological Survey (Point of Contact)
Contact Email
Access Constraints Use Constraints: Acknowledgment of the USGS would be appreciated., Access Constraints: None
Bbox East Long -101.25
Bbox North Lat 41.4
Bbox South Lat 41.0
Bbox West Long -102.24
Coupled Resource
Frequency Of Update notPlanned
Graphic Preview Description Illustration of data set
Graphic Preview File https://water.usgs.gov/GIS/browse/SIM3310_TPNRD_ALL_aqbase_control_points_2014.jpg
Graphic Preview Type jpg
Licence Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials.
Metadata Language
Metadata Type geospatial
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 2008-01-01
Temporal Extent End 2010-01-01

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