probability surface from sites?

[Bill Hargrove]

Grassnetters:

     How can I generate a lightning probability density surface from a
(huge) site file containing every lightning hit for the last 7 years?  I'd
like the surface to return the probability *100 of lightning hitting that
spot.

     Any ideas?
                         Thanks,

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   ____                          Oak Ridge National Laboratory
    /  )      /  /      /  /     Environmental Sciences Division
   /--<   o  /  /      /--/      P.O. Box 2008, M.S. 6038
  /___/__<__/__/_     /  / _     Oak Ridge, TN  37830-6038
William W. Hargrove              (615) 574-1902
hnw at mtqgrass.esd.ornl.gov        (615) 576-8646 (fax)
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