I would try ordinary Kriging. If you have station elevations, I would use co-kriging with elevation as co-variate. Dear Jeff, I also need to interpolate precipitaion data from stations (point data) to counties in ecuador (shapefile). I do have elevation of the stations. I'm new at GIS. But think it is important to account for altitude. Can you please tell me what tool should I use to use co-kriging? and also, do I need an elevation measure for the counties? I really appreciate your help Thanks a lot Maria
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