I am using the mosaic to new raster tool to mosaic two rasters together, one 2-bit and one 4-bit, and the output raster has given all the previously nodata pixels the value 3. Some of the pixels in the output should be 3, their original and intended value, while the majority should be nodata or a much higher or lower value like 255 or -/+ 32,768 that appears when I use the mosaic tool on data with different extents.
Any idea what could be causing this? Should I be converting the 2-bit data to 4-bit to match the other raster?
I have used the tool on very similar data for the exact same process and not had an issue like this before.