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Results tagged with lidar
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user 18981
LIDAR (Light Detection and Ranging or Laser Imaging, Detection and Ranging) is an active optical remote sensing technology that measures properties of scattered light to find range and/or other information of a distant target.
2
votes
Classifying LiDAR data to mid vegetation using LAStools?
You can use lasheight to classify points at different intervals above ground, assuming you have already classified ground points. For example 0-1 meter above ground -> low veg, and 1-6 meter above gr …
- 5,847
5
votes
Accepted
Removing duplicates from large LAS files
If you are open to scripting, I've used several Python libraries to process large (>30 million points) LAS point clouds. The best one I've found is laspy. It easily reads LAS files into a numpy arra …
- 5,847
1
vote
Converting las files from version 1.2 to 1.3
Unfortunately TerraScan does not have full read/write capabilities for LAS specification after version 1.2. Unless you have access to GeoCue and/or LP360, you must process and classify your pointclou …
- 5,847
3
votes
Accepted
How to add points to LAS copy using liblas?
I found my answer in the liblas.header documentation. It states the following:
"The scale factors in [x, y, z] for the point data. libLAS uses the
scale factors plus the :obj:liblas.header.Hea …
- 5,847
2
votes
Contours from DEM with human features
Derivatives of LiDAR are only as good as the point cloud itself. …
- 5,847
3
votes
Extracting tree crown areas from remote sensing data (visual images and LiDAR)
If you have access to LiDAR data, and can generate DEMs/DSMs/DHMs (DEM hereafter, I'm not debating the semantics of surface model nomenclature) from different returns, the following script may be useful …
- 5,847
6
votes
Cleaning blocks pattern from urban LIDAR (blocks uplifted from streets)
I would have to say that without the original LAS point cloud, you will only be incorporating more inaccuracies into the data through raster manipulation. The DEM provided looks relatively clean for …
- 5,847
6
votes
River boundary (bank) extraction from LiDAR
I've been in LiDAR processing for a couple of years now. The best approach we've found is to classify the suspect water points to something other than ground. …
- 5,847
2
votes
Accepted
Identifying flightline ID within an LAS file?
Just saw the source code was updated 5 hrs ago. After an inquiry, it appears that they found the issue I was asking about. They have updated the code to correct the problem. p.point_source_id now retu …
- 5,847
4
votes
LiDAR (.las) to bare-earth DEM: average points spacing and cell size?
I work as part of a production team that acquires LiDAR and generates DEMs for several government agencies, including the USGS. … For instance, if the NPS was 2m for a dataset, our LiDAR derivatives were to be no smaller than 2m. …
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