Did a google
http://www.google.com/search?q=earth's%20gravitational%20field

and found the website of the two satellites used to measure the
gravitational field
http://www.csr.utexas.edu/grace/

I couldn't find the actual data online in my cursery search, but you can
probably find out where to get it by emailing the professors involved in
the above link.

Since it's NASA, the data should be publicly available.

-Adam

Sean Breheny wrote:

>Hi all,
>
>Ready for another of my OT questions? :-)
>
>I'm trying to find a map or other data that can tell me the local
>gravitational acceleration if I know the lat/lon of a point on the earth.
>In other words, I need to find out the local gravitational acceleration
>to better than 1 milliG in Ithaca NY. So far in searching the web, I have
>not found anything that gives this information (at least not directly, I
>found maps of height above the Geoid but I don't know everything that I
>need to know in order to convert this to simple local gravitational accel).
>
>Any ideas?
>
>Thanks,
>
>Sean
>
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