Hi Neil, Yes I have spatial analyst and have used the nearest neighbor tool but was not satisfied with the outcome. I will try idw as you suggested. I don't know how to refine the interpolation and play with the parameters/variables, maybe you can also help with this one: some data have 3 variables for the same point location (example: ground temperature variation with depth), how can I create contours (or any other presentation tool) to show those variations over depth and across the area of interest in the same time, Thank you Leo
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