hello, I would like to perform an interpolation (idw) with griddata but my problem is that I want to extend the the region interpolated define by min(x), min(y) and max(x), max(y). I have tried to define my extented region with start, gridsize and delta kewords. But the result is sometime not good, and the reason is may be due to that the start keword (x_min_region_extend and y_min_region_extend) don't contain a value to interpolate. I think this is easilly done with krig2d notably with keword bounds. Do you have an idea. Jerome metral Research Institut for Development