s.surf.idw & Long/Lat

[Chris Lloyd]

Hello,

I am hoping some one can answer a (probably) simple question that I have.

I want to use s.surf.idw with a Longitude/Latitude database, of course I 
get a result when I use it but I don't know how relevant the result is. I 
know that r.surf.idw uses geodesic distance measures for Long/Lat 
databases and that r.surf.idw2 doesn't but can find no indication of 
whether or not s.surf.idw should be used with Long/Lat databases. 
Rasterising the site files is not an option because I have several sites 
for some individual Long/Lat coordinates.

I would be extremely grateful If somebody could answer this question, or, 
if the answer is negative, any other suggestions for interpolation using 
Long/lat referenced site files would be much appreciated.   

Chris Lloyd
cdl195 at soton.ac.uk

Department of Archaeology,
University of Southampton,
Highfield,
Southampton,
SO17 1BJ