Hello!
There is a lot of information about point clouds, different programs and wiki articles and I'm not sure what's worth to learn.
Can you suggest some basic information to review (links to articles, videos etc.).
Little information about some basic workflow.
I'm interested especially in creating DTM, and how to get rid off unwanted information (trees etc.) if isn't differentiated well.
Regards.
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
Thank you for the information, Kurt!
Unknown said: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
It will be a huge area ~50 km along railway line, and I thing this will be very slow. Is there a way to find the lowest points and create a horizontals by them.
Unknown said:If you want to create a DTM for visualization only
No, I need the DTM only for creating of cross sections, longitudinal profiles and etc. in BRT.
(BRT V08.11.07.685, on MS, SS 2)
You can use Descartes "Smart Snap" to select the highest point along the top of rail to trace the rails or the 3D line follow tool if you have intensities to your point cloud. This will give you a rough horizontal alignment.
fyi- InRoads ss3 has a "convert rails to centerline" workflow located within the InRoads help documentation.
Unknown said:You can use Descartes "Smart Snap" to select the highest point along the top of rail to trace the rails or the 3D line follow tool if you have intensities to your point cloud. This will give you a rough horizontal alignment.
I will try it. But how will I do the calculation of quantities for earth works if I haven't a proper terrain line? And annotation of existing surface in profiles and CS?
Unknown said:fyi- InRoads ss3 has a "convert rails to centerline" workflow located within the InRoads help documentation.
I use this in BRT SS2, and it uses regression points I think. But if the smart snap does multiple snaps between the clicks it will be OK to import as alignment and export the point for regression points.
P.S. Sorry if my English is bad :)