I want to extract the building because I want to make a CONTOUR map but my model has building so that I want to cut the building out.
Welcome! See these notes here to get started with a terrain model (DTM):
Excuse me, I cannot access the link.
Could you provide other accessible link?
Thank you for replying me.
I have updated the link above. The docs have seen a lot of rewriting, and it seems I clobbered the original link.
Also, for elevation models, make sure you have a good data collect for camera calibration, or you’ll get the dreaded “doming” effect: https://docs.opendronemap.org/tutorials.html#calibrating-the-camera