This executable will show you the differences between a new and an old raster. It assumes that the input formats are uint16_t, and output is int32_t to allow positive or negative values.

Build with:

./build.sh

Execute with:

./diffRaster old.tif new.tif

Output will be called diff.tif where positive values represent new appearances and negative values represent new disappearances.

Optionally, add "-merge" to the end of the parameters list to change to merge mode and combine the values from the two input rasters and output merge.tif:

./diffRaster old.tif new.tif -merge