South Carolina Downloadable Data Files
Metadata file: SC_metadata.txt Explanation of grid files: see grid_facts.txt
State composite residual aeromagnetic grid files for three formats (self-extracting zipped):
Land and Offshore coverage
SC_rm400_305m_L-O.grd (Geosoft Oasis Montaj binary format)
SC_rm400_305m_L-O.gxf.exe (grid exchange ascii format)
SC_rm400_305m_L-O.flt.exe (ESRI binary format - requires Spatial Analyst)
Land coverage only
SC_rm400_305m_L.grd.exe (Geosoft Oasis Montaj binary format)
SC_rm400_305m_L.gxf.exe (Geosoft Oasis Montaj binary format)
SC_rm400_305m_L.flt.exe (ESRI binary format - requires Spatial Analyst)
State complete Bouguer gravity anomaly grid files for three formats (self-extracting zipped):
Land and Offshore coverage
SC_grav_cba_L-O.grd.exe (Geosoft OasisMontaj - binary format)
SC_grav_cba_L-O.gxf.exe (grid exchange - ascii format)
SC_grav_cba_L-O.flt.exe (ESRI binary format - requires Spatial Analyst)
Land coverage only
SC_grav_cba_L.grd.exe (Geosoft OasisMontaj - binary format)
SC_grav_cba_L.gxf.exe (grid exchange - ascii format)
SC_grav_cba_L.flt.exe (ESRI binary format - requires Spatial Analyst)
State gravity point files (self-extracting zipped): (11,807 land and 11,086 marine shipboard measurements)
SC_grav_tc.exe (ascii format)
Field |
Description |
1 |
Survey source number |
2 |
Longitude in degrees |
3 |
Latitude in degrees |
4 |
Station elevation in feet |
5 |
Observed gravity in mGal |
6 |
Free-air anomaly in mGal |
7 |
Inner terrain correction (Hammer zones A-F) in mGal |
8 |
Outer terrain correction (Hammer zones G-O) in mGal |
9 |
Complete Bouguer anomaly (density=2.67 g/cm3 ) in mGal |
Get free grid viewing and grid conversion software from
Geosoft: Each of the grid file formats may
be viewed on-screen or printed using the free Oasis Montaj interface
software. The viewer can also convert grids to other grid formats such
as ER Mapper, Surfer, and USGS. This free software is available from
Geosoft at:
http://www.geosoft.com/pinfo/oasismontaj/free/index.asp
Open a file with instructions here
for using the free software.
Other USGS download sites for aeromagnetic data: Ascii files of most USGS digitized analog surveys may be downloaded from: http://pubs.usgs.gov/of/1999/ofr-99-0557/html/mag_home.htm U.S. Geological Survey, 1999). Digital flight line data for most USGS surveys flown since about 1973 are available from: http://pubs.usgs.gov/of/2002/ofr-02-361/ (U.S. Geological Survey and National Geophysical Data Center, 2002).
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