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Re: gravity data online



At 12:18 PM 1/24/01 -0500, Mark Brooks Hedstrom wrote:
I'd like to find a reference where you punch in a location and it gives you
the local value for the acceleration due to gravity (the gravitational field
strength). I presume something like this exists on-line somewhere,

Yes, it sure does.

For a summary of what exists, check out
http://www.ngdc.noaa.gov/seg/potfld/gravity/document/html/tablegri.htm

For a colorful low-resolution view of the "Sandwell" data, check out
http://www.ngdc.noaa.gov/seg/potfld/gravity/data/global/sandwell/ww_grav.gif

For higher resolution you an buy CDs from NOAA, or you can download the
data (half a gigabyte) from various places including
ftp://topex.ucsd.edu/pub/global_grav_1min/
which contains:
README.9.1 6 Kb Fri Jun 04 00:00:00 1999
README_SPONSORS 414 bytes Sat Nov 28 00:00:00 1998
gips_grav.head 754 bytes Sat Nov 28 00:00:00 1998
grav.img.9.1 534600 Kb Mon Aug 14 08:22:00 2000
grav.img.9.1.ers 863 bytes Wed Jan 06 00:00:00 1999
src_gmt/ Sat Nov 28 00:00:00 1998 Directory
src_img/ Mon Nov 30 00:00:00 1998 Directory

Note that the subdirectories contain programs for handling the data. See also
http://www.ngdc.noaa.gov/seg/potfld/gravity/data/global/sandwell/programs/