Questions tagged [las]
An industry-standard binary file format that maintains information related to lidar data.
337 questions
0 votes
1 answer
26 views
Bug in lidR when identifying tree canopy surfaces in LAScatalog?
I am trying to identify tree canopy surfaces using lidR in an urban area. To do this, I have been trying to use the readLAScatalog() functionality to prevent memory issues. If I use my code on a ...
- 71
0 votes
0 answers
37 views
Pdal's Litree is taking too long
pdal's litree is taking too much time. the script is running for 45 minutes and it is only at the 4th tree. PROJ: proj_as_wkt: Open of /home/adminis/conda/envs/pcd-editing/share/proj failed (pdal ...
- 11
1 vote
0 answers
68 views
Converting lat/lon in WGS84 to the local coordinate system
I have a GPS trajectory with coordinates in WGS84 (latitude and longitude). I also have a LAS point cloud, which uses a local coordinate system. The LAS file defines a reference point with known ...
0 votes
0 answers
62 views
Using LidR to add new attribute to LAS file point cloud from GeoTIFF raster
I am currently trying to add a new attribute to a LAS file so I can use it for classification of the points, based on the values in a GeoTIFF file. For this I am using the merge_spatial function in ...
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0 votes
0 answers
45 views
PotreeConverter output structure incompatible with iTowns PotreeLayer – No /r/xxxxx/rxxxxx.cin or .hrc files
I'm currently working on a 3D visualization project using iTowns, and I’m trying to convert my point cloud data into Potree format to improve performance and ensure compatibility with PotreeLayer in ...
0 votes
1 answer
54 views
Getting NoData strips, and high memory usage, when processing block-maximum/minimum rasters from LiDAR using Whiteboxtools
I'm processing LiDAR elevation data, sourced from Discover GIS Data NY, into block-maximum and block-minimum rasters (GeoTIFF) with WhiteboxTools' LidarBlockMaximum (and LidarBlockMinimum) tools. I'm ...
- 422
1 vote
1 answer
47 views
lidR does not update header when both VLR and EVLR supplied
I am using lidR version 4.1.2 and some of my files have projections written in both the VLR and EVLR fields. However, when I use st_crs(some_laz) = "some_crs" only the VLR is being updated ...
- 171
0 votes
0 answers
232 views
Merging 300GB + of las files into one laz file
I'm working with point cloud processing and I'm having some issues to manage to merge the point cloud files I have, is something around a billion points in las format. I need to merge them into a ...
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2 votes
0 answers
38 views
Arbitrary Cartesian coordinate systems in OGC WKT1
I have a pointcloud obtained from a LiDAR sensor, and this pointcloud uses a local Cartesian coordinate system, defined by the initial pose of the sensor, together with GNSS data obtained by the ...
0 votes
1 answer
75 views
Conversion from XYZ to LAS causing same values for lat,long
I am trying to convert XYZ to LAS using the laspy library. Following are few points from input XYZ: 73.857515249445171 18.514095016670616 572.279999999999973 73.857515225451863 18.514098631209944 572....
3 votes
0 answers
151 views
Difficulties producing a colorized point cloud for QGIS
For some project, I am trying to colorize a point cloud using the orthophoto from the same coordinates. I followed various tutorials, and using cloudcompare, i managed to produce a colorized point ...
- 153
0 votes
0 answers
86 views
Correcting GPS time incoherances in a LAS file
I am Working in R using the lidr package to do tree canopy delination. When I am checking my LAS file I receive the following messages: Warning: There are 11063 points flagged 'withheld'. Checking the ...
1 vote
1 answer
109 views
PDAL readers.las Error returning GDAL Failure (1) "components of the compound CRS do not belong to one of the allowed combinations of ..."
Encounter following errors while trying to read .las data from LidarBC (dwld data here if needed). I am using pdal=2.7.1 and have libgdal=3.8.5. When i try to translate the linked file with pdal ...
- 168
0 votes
1 answer
145 views
Why are there "no returns" in my point cloud and am not able to display or process it in lidR?
I have a point cloud I collected and converted to a .las in the proprietary software "FARO Connect". I am able to visualize the point cloud in the software. However, when taking the .las ...
- 23
1 vote
1 answer
227 views
Why does readLAS() not work in older versions of lidR anymore?
I am unfortunately dependent on an older version (4.0.4) of the lidR package due to a package dependency. Strangely enough, the import of LAS files with readLAS() no longer works since a system update....
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