USGS Open-File Report 2005-1231
The U.S. Geological Survey (USGS) contracted with Sander Geophysics Limited to fly an aerial survey of parts of Cameron, Hidalgo, and Willacy Counties in southwestern Texas (view index map for location). The survey was flown at a nominal altitude of 150 m above the ground. Flight lines were oriented east-west with a line spacing of 200 m. Tie lines were flown north-south at a spacing of 2000 m. The data collected by the contractor included radar altimetry, GPS coordinates, barometric pressure, air temperature, the magnetic field, and gamma-ray spectra. The data were processed by the contractor and all industry standard corrections were applied. For more detailed information about the survey and the procedures followed during data collection and processing refer to the contractor report submitted to the USGS.
Geologic Setting | Gamma-ray Data