Hi, The following channel has lots of videos that will aid you with your workflow. http://www.youtube.com/user/GeoSpatialAE Some specific videos to assist you with creating a dtm: Terrain from Point Cloud : https://www.youtube.com/watch?v=vVLDWyc7n_Q&list=UUgwBtgmuVxoNjYCfetX3wQg 3D Line following : https://www.youtube.com/watch?v=aXx0lIMPXL4 Visual Explorer : https://www.youtube.com/watch?v=-OlrqWAwIJA Quick Section : https://www.youtube.com/watch?v=YUlb7TyOyaU Drape and Snap : https://www.youtube.com/watch?v=u6p5MNFr9PY Smart Snap : https://www.youtube.com/watch?v=_9-sKSFtqCI&list=UUgwBtgmuVxoNjYCfetX3wQg And I would use classification to remove unwanted points using the methods shown in this video: Custom Classification : https://www.youtube.com/watch?v=8mElEtnLrQw HTH, Kurt
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