Hello,
Using ArcMap 9.3, I'm trying to interpolate a surface from a shapefile containing precipitation values for various rain gages. The data is monthly, and I'm creating surfaces for one month at a time.
Some gages were not functional over the entire time period, so values of -99999 were used to show that is an invalid point (which needs to be distinguished from valid 0 values).
Is there a way to ignore these values when using Kriging, IDW, or other interpolation methods? Otherwise, I will get giant valleys in my rasters.
Thanks.
