I have a DTM and DSM files. I want to develop a Canopy Height Model (CHM) in QGIS. Is it possible?
Within the raster calculator plugin you would subtract one file from the other: DSM - DTM. This will give you a new file that would be just the canopy.
The canopy model in QGIS is obtained by subtracting DTM from DSM which gives the height of the tree (Kim et al., 2010).