I have produced a mosaic of raster files in ArcMap using Create Mosaic Dataset and Add Rasters to Mosaic Dataset. At this point I have a dataset which appears to be functioning fine, however when I attempt to use the Hillshading (Spatial analysis) tool it develops holes. These holes are not always in the same places.
The Hillshading tool gives me no errors. The image below shows the same geographical area, with the raster mosaic and the hillshading.
Any help with solving this would be much appreciated.
Check the defaults tab of the mosaic Dataset properties window for the Maximum Number of Rasters per Mosaic setting. The default value is 20. It looks like you need double that value. Just be aware that higher values will reduce performance since this setting controls how many rasters are dynamically mosaiced together. Building overviews on the mosaic dataset will help with performance.
Haver you solved your problem?
Stupid question - have you tried turning off background processing? I've had various (illogical) problems with it enabled and therefore always turn it off.