Let's say I have a set of points representing bridges. I want to create a kind of "heat" map that would highlight areas within my study area that has many bridges in good or bad condition. I have a rating attribute for each bridge point.
I've tried the spline interpolation method (in ArcGIS spatial analyst) which seems to work okay but it interpolates values for the entire area. I only want raster values for areas that within a certain distance of a bridge point (say one mile for example). How would I go about doing this?