Problems with Lidar and Terrain Model

RE: Problems with Lidar and Terrain Model

pieter Dorp — Thu, 11 Aug 2022 12:06:27 GMT

You are right about the import of photogrammetry.

RE: Problems with Lidar and Terrain Model

Tamara Lynn — Wed, 11 Sep 2019 12:50:42 GMT

Where do I find more information on converting my LAS to the right version? I have a LAS file from photogrammetry and all the points are coming in under the 'created' style, so I cannot turn off vegetation or anything. Is that because it is from photogrammetry instead of LIDAR?

RE: Problems with Lidar and Terrain Model

Jean Mouton — Tue, 05 Sep 2017 20:32:06 GMT

Realized the LiDAR was version 1.4 which is not currently supported. You have to use LASTools to convert.

RE: Problems with Lidar and Terrain Model

Tom Felcone — Wed, 30 Aug 2017 11:07:20 GMT

Jean,

Just for testing purposes, you may want to try some of the USGS Lidar data ( https://earthexplorer.usgs.gov/ ). Won't fix the problem, but might give you an idea where the problem is.

Tom F.

RE: Problems with Lidar and Terrain Model

Jean Mouton — Mon, 28 Aug 2017 13:55:43 GMT

If anyone knows what is diiferent about how "Civil Terrain Model" and Point Cloud process data, maybe that could help?

RE: Problems with Lidar and Terrain Model

Jean Mouton — Mon, 28 Aug 2017 13:43:39 GMT

Thanks for the suggestion, unfortunately, I already tried that. When I bring in the las using a point cloud it does not come in using correct coordinates or elevation. The above picture of white points scattered everywhere is just the Model Key of the las. The yellow triangulated surface was created using the civil terrain tool. There is no option to weed out vegetation or buildings. There is just ground, unclassified, and created. I'm wondering if something is wrong with the las or if I have a setting, or coordinate system wrong somewhere.

RE: Problems with Lidar and Terrain Model

Tom Felcone — Thu, 24 Aug 2017 13:53:17 GMT

Jean,

LAS should be fine. After you attach your point cloud check for classification. Classification is to point clouds what levels are to MicroStation. You can find this under VIEW ATTRIBUTES. You can turn off vegetation, buildings etc. Once you've turned off vegetation, buuildings etc. use the import from point cloud tool (SS4). If you only want part of the point cloud put a fence around it before you create your terrain model.

HTH,

Tom F