David Fitterman Maria Deszcz-Pan, 2002, Helicopter Magnetic Data: USGS Open-File Report 02-101, U.S. Geological Survey, Denver, CO.Online Links:
Planar coordinates are encoded using Coordinate Pair
Abscissae (x-coordinates) are specified to the nearest 0.1
Ordinates (y-coordinates) are specified to the nearest 0.1
Planar coordinates are specified in meters
The horizontal datum used is North American Datum of 1983.
The ellipsoid used is Geodetic Reference System 80.
The semi-major axis of the ellipsoid used is 6378137.
The flattening of the ellipsoid used is 1/298.257.
For a description of the channels in the corrected dataset see Table 4 (<http://sofia.usgs.gov/publications/ofr/02-101/table4.html>)
The U.S. Geological Survey contracted with Dighem, then a division of CGG Canada, Ltd, of Mississauga, Ontario, Canada, to fly a helicopter electromagnetic survey over parts of Everglades National Park and surrounding areas of south Florida.
303 236-1382 (voice)
303 236-1425 (FAX)
fitter@usgs.gov
This project addressed the question of determining the location of the fresh-water/salt-water interface (FWSWI) in the coastal regions of southern Miami-Dade and Monroe counties, synoptic monitoring of changes in water quality associated with changes in water management practices, and looking for geophysical evidence of subsurface discharges to Florida Bay.This project provided basic information needed to create ground-water models and test various restoration strategies and their impact on ground-water quality.
Person who carried out this activity:
303 236-1382 (voice)
303 236-1425 (FAX)
fitter@usgs.gov
Person who carried out this activity:
303 236-1317 (voice)
maryla@usgs.gov
Fitterman, David V. Deszcz-Pan, Maria; Stoddard, 1999, Results of Time-Domain Electromagnetic Soundings in Everglades National Park, Florida: USGS Open-File Report 99-426, U.S. Geological Survey, Reston, VA.Online Links:
Deszcz-Pan, M. Fitterman, D. V., Lason, V. F., 1998, Reduction of inversion errors in helicopter EM data using auxiliary information: Exploration Geophysics v. 29, Society of Exploration Geophysicists, Tulsa, OK.
unknown
During the interpretation of the datset provided by Dighem, errors in the data became apparent which caused difficulties in obtaining reliable layered-earth inversion models. These errors were traced to problems with calibration and with the bird tow-cable length. Calibration errors were corrected using a procedure described in Deszcz-Pan et al, 1998.
Are there legal restrictions on access or use of the data?
- Access_Constraints: none
- Use_Constraints: none
727 803-8747 ext 3028 (voice)
727 803-2030 (FAX)
hhenkel@usgs.gov
helicopter electromagnetic data
The data have no guarantees explicit or implied
Data format: | There are two versions of the dataset. The original dataset and a corrected dataset in format ASCII |
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Network links: |
<http://sofia.usgs.gov/publications/ofr/02-101/data.html> |
727 803-8747 ext 3028 (voice)
727 803-2030 (FAX)
sofia-metadata@usgs.gov
U.S. Department of the Interior, U.S. Geological Survey, Center for
Coastal Geology
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Henkel - Webmaster
Generated by mp version 2.8.18 on Fri May 25 10:27:16 2007