Directory Identifier: GRAVCD-isores
Directory Title: U.S. Isostatic Residual Gravity Grid
Principal Investigator: Numerous
Contributing Organization: U.S. Geological Survey
                           345 Middlefield Road, MS/977
                           Menlo Park, CA 94025

Summary: isores.bin - standard grid containing isostatic residual 
gravity map for U.S.  Grid interval = 4 km.  Projection is Albers 
(central meridian = 96 degrees West; base latitude = 0 degrees 
North).  Sea level depth of compensation = 30.0 km, density 
contrast at depth = 0.35 g/cm^^3. Values are in milligals.

Data Records: The data are binary and are in 4 byte integers. The 
integer value must be divided by 100 to get the actual value with 
two digits to the right of the decimal point.

Original File = 4,045,520 bytes
              1300 columns X 772 rows = 1,003,600 data
              4 bytes / data point    = 4,014,400 bytes
The data are stored row wise starting in the upper left corner.
---------------------------------------------------------------
NOTE: The binary files isores.bin, isoreg.bin, and isotop.bin 
were converted from the ASCII files on the Geophysics of North 
America CD-ROM by Ted Habermann. The data values were converted 
to 4 byte binary integers with two digits to the right of the 
decimal point. These integers must, therefore, by divided by 100 
to recover the original data.
---------------------------------------------------------------