I have two raster data sets:
- a DTM that covers my desired extent
- river bathymetry data that has the correct river depth data, but only an extent that covers the river itself, everything else is
I want to create an output raster that merges these two, using the bathymetry data if it is available, and the DTM data if it is not.
On the assumption that bathymetry data will have a lower value than the DTM data for a given cell, I have tried:
- The "Mosaic to new Raster" tool with a mosaic operation of MINIMUM
- The "Cell Statistics" tool, also using MINIMUM
Both of these result in an output raster that almost looks correct, but the extent does not match that of the DTM and the minimum and maximum values for the output raster do not match my expectations as the lowest value in either the DTM or the bathymetry data is -20, and the output raster goes to -50.
Am I doing something majorly wrong, or is there a better way to do this?