I am trying to figure out how to combine two adjacent rasters into one raster using ArcMap 9.3.1. The problem I am having is that there appears to be a gap in the data. I would like to be able to combine the rasters and/or contour data created from the raster datasets into one so that I can get rid of the gap in information. I am eventually going to do a watershed analysis, so I am seeing the gap in information as a problem.
I'd post a screenshot but I don't have enough reputation points yet.
Best Answer
You need to create a raster that has spatial extents that contain both of your previous rasters (see Create Raster Dataset). I suggest setting the value for this new raster to be 0.
Then, you can add the existing rasters to the new blank raster. To fill in the gap, you can use
Spatial Analyst, choosing the optionNeighborhood Statisticsto interpolate or smooth the gap. Depending on how big it is you may need to adjust the radius you are choosing to smooth.You may also want to run the smooth part, and then recombine your rasters so that you do not loose resolution on your entire dataset.