The ArcGIS Help file says the Default Maximum Distance, when using the Variable Search Radius in IDW, is the extent's diagonal, however, no value is automatically filled in the corresponding box after I define the extent, so is ArcMap really using this default value if the box is empty?
Regarding coincident points (different measurements at the same location) when running IDW, it is possible to set the Environment "Geostatistical Analysis" to Min, Max, Mean, etc., but is this selection really honored when running IDW using Spatial Analyst, or does it only apply to tools from the Geostatistical Analyst extension? I am confused because the ArcGIS help says: "Tools that honor the Coincident Points environment define how coincident data is treated in Geostatistical Analyst". If the Coicident Point selection is not honored when using Spatial Analyst, how do I know what IDW is doing about them? Thanks a lot for your help!