Hi all, I want to interpolate ten years monthly weather data (lon/ lat/ temperature) with IDW. Also the produced surface size should match a NDVI imagery (per pixel size is 8 km). I wrote a small programm to do the interpolation with Fortrain language. But the problem is I counldn't match the result surface to the NDVI imagery exactly. Is anybody out there, who did this with IDL and can explain to me how to do it? thanks!