Questions tagged [lastools]
Software for LiDAR processing tools.
101
questions
0
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0
answers
37
views
How to classify points in LAStools using shapefiles as reference
I am new to LAStools, and mostly use MicroStation/Terra for classifications, except MS is a resource heavy at times so can be slow and can crash. The macro we run uses shapefiles as a reference, and ...
0
votes
0
answers
14
views
Is it possible to suppress the GUI for lasboundary within a python script?
This is the lasboundary call:
Lasboundary = [lasboundary,
'-i', LBin,
'-odir', ClipFolder,
'-labels',
'-overview',
'-oshp'
]
pcs = subprocess.run(lasboundary, check=True, stderr=subprocess.PIPE)
It ...
- 23
0
votes
0
answers
47
views
Clipping LiDAR Data to Map Data w/ LAStools bounding boxes have no overlap
I am trying to clip a series of LiDAR .las files with the lasclip64 tool in LAStools. The area I am trying to clip is Prospect Park in Brooklyn, NY. I have retrieved the .shp file for this area from ...
0
votes
1
answer
69
views
QGIS 3.28 and LAStools issue - lasinfo not recognized as an internal or external command
I'm trying to run one of LAStools open source commands on a .laz file I have.
I have installed the plugin in QGIS v. 3.28, and have downloaded the LAStools-master folder available through GitHub (...
2
votes
1
answer
335
views
How to efficiently reproject a LAS point cloud to EPSG:2056 (not known by LAStools)?
I have a large LAS pointcloud in LV03 (EPSG:21781) that I want to reproject to LV95 (EPSG:2056). My approaches so far bear no fruit.
What is a good way to re-project LAS data to a different CRS (...
- 2,334
1
vote
1
answer
392
views
Troubles running LAStools on QGIS 3.28 Firenze. MAC, operational system MacOS 12.4
I ran into an issue of running the LAStools on QGIS. As it states in the subject, I have 3.28 Firenze version of QGIS, and it's operating on MacOS12.4
Every time I tried to run LASview, I get this ...
- 11
3
votes
1
answer
307
views
In which step should we reproject a LiDAR Dataset using LAStools when extracting DSM and DTM?
I have a lidar dataset from which I am trying to extract a DSM and a DTM (in meters) from it for EPSG 32614 (WGS84). Below info:
lasinfo (220926) report for 'C:\LAStools\bin\Data\Cornfield Non\Backup ...
0
votes
0
answers
482
views
Export LAS file to XYZ and retain RGB values
I am currently trying to import LAZ LIDAR data into ArchiCAD (a 3D modeling software) for an architectural project. Using QGIS 3.22.11 and LAStools las2txt I have successfully exported the LAZ file as ...
- 1
0
votes
0
answers
302
views
LASTools QGIS clip not working
As I am trying to clip the LiDAR data (.las) file from shapefile (.shp)
I have used the lastools(lasclip) to clip the .las file from area of interest that is shapefile from Qgis plugin but it didn't ...
0
votes
1
answer
345
views
LAS2DEM QGIS No Results
When I try use LAS2DEM in QGIS, the results are an empty file:
I have followed all setup instructions with the LAStools zip folder (in a C:\ with no spaces or special characters in the path, and set ...
- 1
0
votes
2
answers
163
views
How do I create a LAS file coverage grid in QGIS?
I need to take a folder of .las files and create a coverage grid overview with an attribute for each las tile's file name within each polygon record, each polygon being the rectangle of that las file'...
- 193
0
votes
1
answer
165
views
las2las - Reproject (shift) from shifted X,Y projection to original projection
I have a .las projected in a shifted EPSG:2100 projection. Coordinates are shifted by X,Y as following:
X: 58xxxx -> xxxx
Y: 414yyyy -> yyyy
For EPSG:2100, projection parameters are given here:...
- 183
1
vote
0
answers
125
views
txt2las to change the format from ASCII to LAS
I am working on many files with the format (.asc), I am trying to change the format to LAS/LAZ but for some reason only 8 files from 42 files have been successfully changed for the others the error is ...
- 11
0
votes
1
answer
48
views
blast2dem pixel alignment
Is there a way for blast2dem to tell exact fractional coordinates (or offset) where should the pixel in the generated GeoTIFF start?
In my case I would like to generate a raster that is perfectly ...
- 572
0
votes
0
answers
173
views
lasinfo - Codec can't decode byte
I am adding lidar info into qgis, and when I run lasinfo I get the errors listed below. I have tried redownloading the data but the same errors always come back
Errors
Parameters
verbose False
run new ...
2
votes
1
answer
234
views
Why do lidR and LAStools report different point densities?
Why do lidR and LAStools report different point densities?
For a .las that I have here. Both report number of points correctly at 12500 pts.
The CRS is set and both also report it correctly.
But for ...
- 205
0
votes
0
answers
147
views
Using txt2las in lastools
I'm currently doing a masters thesis on using drone photogrammetry to create a canopy height model of a grassland. This involves manually creating a DTM using an RTK GPS and using that data to ...
- 1
2
votes
2
answers
889
views
How to read LAS header or read only some attributes of LAZ file with LAStools/C++
It takes lots of time when reading laz files when you iterate hundreds of laz file. But reading only the header can only takes less than 100 ms to read hundreds of las files.
The same problems arises ...
- 21
1
vote
0
answers
118
views
How to invert LAS files
I have a bunch of LAS files which are supposed to show data underwater but the depth (z) is poisitive rather than negative so they are inverted. I'm looking for the fastest way to invert/flip them on ...
- 1,896
1
vote
0
answers
151
views
Converting a huge .LAS into a readable 3D file
I've got a huge (1.3GB) .LAS file that is composed of data from around the Golden Gate Bridge in San Francisco. I'm trying to get it into Blender, a 3D software, so I can look at the surroundings and ...
4
votes
2
answers
504
views
Extracting a DEM without low vegetation cover in a flooding area using LiDAR data
I've been struggling with this for the past few days. I want to create a DEM of a flood control area, which is covered in low/intermediate-height vegetation (pioneers and reed mostly). The point cloud ...
- 51
2
votes
1
answer
2k
views
Failed to install Potree on Ubuntu 20.04.1 LTS
I am trying to install Potree on my computer and I am stuck. I am following these instructions:
$ sudo apt-get install python-software-properties git
$ sudo apt-get install build-essential cmake g++
$ ...
2
votes
0
answers
34
views
Modeler - output of first algorithm not going to second one and so on
I've a model with subsequent steps of LAStools algorithms. Individually they work well, but in the modeler I get only the first output, and no more. It seems like the second algorithm is not taking ...
0
votes
1
answer
279
views
Shift or replace_z values from ALS LiDAR scans
I have ALS LiDAR scans that I merged into a single file and classified ground points. I'm trying to 're-scale' the Z/height values but without actually normalizing them.. What I'd like to do re-scale ...
- 1,370
0
votes
0
answers
491
views
Defra LiDAR - Convert DTM to PointCloud?
Defra has DSM and DTM data for Blackwell in Birmingham, but no Point Cloud data. I am trying to get LiDAR Point Cloud data to build a golf course model (in TGC2019) for Blackwell, and this uses ...
- 117
0
votes
1
answer
405
views
How to normalize a large point cloud using lasheight and a .tif DTM?
I am normalizing a large point cloud (>16 GB), for which I'm using a preprocessed DTM that I store as .tif.
For smaller amounts of data, I would use an R script that lets me do this:
library(lidR)
...
- 2,334
3
votes
1
answer
253
views
Different results in metrics calculated with LAStools and lidR
I have canopy height model calculated from high density TLS data on 60 by 200 meter plot.
I tried to calculate voxels with LAStools and lidR and got significantly different results. I was wondering if ...
- 892
2
votes
0
answers
238
views
Calculate average elevation value in LAS files in a specific area [closed]
I need to calculate the average elevation and its standard deviation of some buildings and parts of roads using LAS files.
I want to be able to consider only the points that are within a polygon in a ...
- 51
1
vote
0
answers
109
views
LiDAR data denoising algorithm complexity
I want to remove outliers (noise) from LiDAR data.
Currently I'm using the same algorithm as LAStools:
The LAStools software version 171215 implements a straightforward outlier
removal ...
- 111
0
votes
0
answers
322
views
las2dem, command not found in terminal
I am trying to use the command las2dem in terminal (Ubuntu) to create a DEM with various las files but I only want to conserve the points classified as Ground. I'm using this command:
las2dem -i file....
- 51
2
votes
1
answer
386
views
Georeference a LAS file with txt2las using a Geomedia coordinate system file (.csf)
I need to transform a file in a .csv file into a LAS file. I have a LiDAR data folder, in this folder I have these files:
A .csv file that contains the the point data
Some metadata files (schema, ...
- 51
0
votes
1
answer
71
views
Running lasground on input cloud produces no visible effect in lasview?
Running lasground on input cloud produces no visible effect in lasview?
It runs and writes an output file, which seems unchanged from the input file, when viewed in lasview.
What could be wrong?
- 205
0
votes
0
answers
451
views
Convert .las file with LAStools in QGIS
I get the following error when trying to convert a .las file using las2txt with the LASTools plugin:
My system is set to UTF-8.
QGIS code revision: 4470baa1a3
Qt version: 5.11.2
GDAL version: 2.4.1
...
- 11
0
votes
0
answers
383
views
Reproject LiDAR from Lat/Long to NAD83 with LAStools not working correctly
I'm trying to reproject a NOAA las file from Lat/Long to State Plane NAD83 using las2las.
When I unpack the laz file as an las without specifying input or output coordinates it comes into GIS in the ...
1
vote
0
answers
126
views
Tears when using LAStools lassplit
I have just started using QGIS and im trying to create a DEM from laserdata using LAStools.
I have to split the laserdata since im not using a premium LAStools, but when i do i get these tears where ...
- 11
2
votes
0
answers
16
views
Match DSM tiled data [duplicate]
I have an 282 .laz tiles for a large area. The aim was to extract the DSM and DTM data in .asc format to hopefully get building heights from them. I used lastools to convert them the DSM .laz data ...
1
vote
1
answer
397
views
LAS file bounding box is oversized after using lasnoise?
I have a few .las files that I am trying to use further. They have some far away noise points that I removed using LAStools lasnoise. It seems like the noise points are removed, but the bounding box ...
- 13
0
votes
0
answers
167
views
How to solve cannot alloc point_buffer error LAStools?
I have just installed LAStools in my QGIS 3.x version. I have already managed to visualize the point cloud through the lasview tool. Now, I am having problems trying to classify Ground points from the ...
0
votes
1
answer
1k
views
Laspy - Laszip & TypeError
I'm having some issues with Laspy and reading in .laz files.
Previously I have had no problem with this, but it has stopped working.
Initially I had a problem with the following error message: "laspy....
- 11
2
votes
0
answers
263
views
Installing LAStools in QGIS 3.4
I am trying to install LAStools for QGIS3.4. I installed the plugin, downloaded LAStools and also wine. But if I try to run it for lasview, this is the error I get:
Processing algorithm…
Algorithm '...
3
votes
1
answer
479
views
Extracting (big) rocks from LiDAR data
I have a .las file and want to show the outline of the big rocks located in this area.
So far I have done the following:
Obtain a ground model from the .las file including the rocks.
Calculate ...
- 151
0
votes
1
answer
1k
views
Error when unzipping LiDAR data with LAStools
I try to unzip LiDAR data (.laz) with LAStools under QGIS 3.4 but I get following error message :
Traceback (most recent call last):
File "path\to\LAStools\laszip.py", line 61, in processAlgorithm
...
- 1,097
-1
votes
1
answer
519
views
error message"system cannot..."
After several intents to reinstall everything (even qgis3.8.2 zanzibar), and verify the path (several times) for the lasstools plugin, still cannot use it, as consequence of the error message the ...
1
vote
0
answers
2k
views
LASTools path not found in QGIS 3.6.3
Forgive me if this is a duplicate, but I am having trouble getting LASTools to run in QGIS 3.6.3 after following the installation instructions and searching on Stack Exchange.
I have installed the ...
- 11
1
vote
1
answer
418
views
Retrieve the elevation from a point cloud with lastools?
I have a general question about how can I get the elevation (z) data from a pointcloud (las) along a trajectory. I have a shape file with x, y coordinates and I have the related .las files. And I am ...
- 31
2
votes
2
answers
3k
views
Using LAStools to repair headers for several LiDAR files?
So, I have 21 LiDAR files with incorrect information in their file headers. For example, when I import a single file into R using the following code, I get several warnings saying that there are no ...
8
votes
1
answer
8k
views
LAStools plugin in QGIS: ''The system cannot find the path specified."
I'm attempting to convert LAS files to a multipoint file using QGIS methods. I've found some documentation that suggests that v3.2 and up has LAStools available as a plugin so I downloaded the latest ...
- 83
11
votes
3
answers
3k
views
Difference between LAStools, libLAS and PDAL?
After many readings, I'm still confused about the difference of use and the aims of the following tools for LiDAR data processing and manipulation: LAStools, libLAS, and PDAL.
My understanding so far ...
- 302
1
vote
3
answers
965
views
Maximum number of returns per laser pulse in airborne LiDAR?
What is the maximum amount of returns a discrete aerial laser scanner is capable of recording?
For example in a LAS 1.2 metadata under Point Data Records there is the category
'Number of Returns' ...
- 315
0
votes
0
answers
89
views
Downloading LASTools on Windows 10, QGIS 2.18.24 - Error Message [duplicate]
Following the instructions on this page;
How to install LAStools toolbox in QGIS
I came across this error when I tried to define the path to my LASTools folder in the QGIS Processing Toolbox Menu [C:\...
- 315