We are working with peatland restoration sites providing aerial photogrammetry of the restoration progress. We want to differentiate between areas water and bare peat which can look very similar in the orthomosaic raster. However, in the DEM the water features are instantly recognisable as they have a jagged and irregular surface. We can hillshade the DEM to show these areas and manually map them, but is there an easy way to automate this in QGIS?
Started playing with OTB and object based classification but not sure how to achieve this from the DEM as it's a single band raster.
Update, photos show a section of the orthomosaic, then the classified raster with bare peat (black), water (blue), vegetation (heather - green), and unclassified (transparent, showing the ortho below). It would be a great help to make the water areas solid and export as a shapefile.