I am currently working on a project in which I am modelling lava flows (using a plugin). I have run all eruption simulations but now want to add barriers/walls that would change the height of the DEM so I can assess mitigation strategies.
I have tried drawing polygons and lines and building mosaics but they haven't worked.
Is there a way of changing the height of certain pixels or drawing a polygon/line to make it part of the raster DEM?
Any advice/help is much appreciated!