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)


Fields for ASCII gravity data file




Survey source number


Longitude in degrees


Latitude in degrees


Station elevation in feet


Observed gravity in mGal


Free-air anomaly in mGal


Inner terrain correction (Hammer zones A-F) in mGal


Outer terrain correction (Hammer zones G-O) in mGal


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: 
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:  U.S. Geological Survey, 1999). Digital flight line data for most USGS surveys flown since about 1973 are available from: (U.S. Geological Survey and National Geophysical Data Center, 2002).

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