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Airborne electromagnetic and magnetic survey data, southeastern San Joaquin Valley near Cawelo, California, 2016: Processed AEM data

Metadata Updated: July 6, 2024

Airborne electromagnetic (AEM) and magnetic survey data were collected during October 2016 over a total distance of 262 line kilometers in the southeastern San Joaquin Valley near Cawelo, California. These data were collected in support of groundwater salinity mapping and hydrogeologic framework development as part of the U.S. Geological Survey California Oil, Gas, and Groundwater program and the California State Water Resources Control Board’s Oil and Gas Regional Monitoring Program. Minimally processed binary AEM data received from SkyTEM ApS were imported into the Aarhus Workbench software (Aarhus Geosoftware, Aarhus, Denmark) and processed. Filters were applied to inclinometer and spatial positioning data to smooth raw data and remove sensor dropouts. Altimeter data were filtered, smoothed, and manually edited to correct false altitudes associated with trees and other obstacles, resulting in processed altitude representative of the distance between the AEM sensor airframe and bare earth. Ground surface elevations were imported from the 1 arc-second USGS National Elevation Dataset. Raw electromagnetic data were visually examined for couplings and noise associated with infrastructure and considered in the context of the locations of known or suspected infrastructure (powerlines, pipelines, etc...) and magnetic anomalies; impacted data were manually removed. Culled electromagnetic data were spatially averaged using a sounding distance of 1.5 seconds and trapezoidal filter widths of 4 and 6 seconds applied after gate time 1e-5 and 1e-4 seconds (low moment data) and 4 and 6 seconds applied after 1e-4 and 1e-3 seconds (high moment data). Low-signal data were removed from the averaged data through a combination of filters and manual culling. The data provided include fully processed electromagnetic data produced from minimally processed contractor-delivered data, also provided with this data release. The digital data are described in the data dictionary, additional details regarding processing steps are described in the metadata.

Access & Use Information

Public: This dataset is intended for public access and use. 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 Created Date June 1, 2023
Metadata Updated Date July 6, 2024

Metadata Source

Harvested from DOI EDI

Additional Metadata

Resource Type Dataset
Metadata Created Date June 1, 2023
Metadata Updated Date July 6, 2024
Publisher U.S. Geological Survey
Identifier USGS:5d643159e4b01d82ce98718f
Data Last Modified 20220512
Category geospatial
Public Access Level public
Bureau Code 010:12
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Harvest Object Id 0198675a-35ad-4960-9b43-bc3b5aa39f27
Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
Harvest Source Title DOI EDI
Metadata Type geospatial
Old Spatial -119.200059,35.466276,-119.086927,35.593321
Publisher Hierarchy White House > U.S. Department of the Interior > U.S. Geological Survey
Source Datajson Identifier True
Source Hash 1629aeee80d3b37d61e2d596a109bbc722c462f94739aaf3344b318b279a7cf2
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": -119.200059, 35.466276, -119.200059, 35.593321, -119.086927, 35.593321, -119.086927, 35.466276, -119.200059, 35.466276}

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