[STATSGRASS] IDW when d=0?

[Hamish]

Hi,

Using an Inverse Distance Weighting formula, such as this one ..

http://gis.nrcan.gc.ca/~viljoen/gis/interp/idw.ht1.jpg

.. what happens when d=0? You want weighting to be huge when you are
right on top of the interpolation spot, but not DIV0!

I can change all 0's to 1's as my distances extend to 1000, but that's just a cheap hack and doesn't solve the general case.



thanks for any ideas,
Hamish