I have several different point feature classes (shape files) spread on a grid, each point (located at grid centers) has a attribute named value. For example, assume we have a 3x3 grid, which has nine point features at the grid centers. The first point feature class is the four lower left ones with value = 1, and the second point feature class is the four upper right ones with value = 2. Now I want to merge these two feature classes, and get a new feature class with seven (not eight) points and with value being sum of the first and second one, as indicated in below picture.
How can I do it in ArcGIS?
I tried Merge or append tools in ArcGIS but it will not add values the way I want.