Questions tagged [laz]
It is the compressed version of lidar las files from the open source software LASzip
37
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19
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Output of Point Cloud Cropping using PDAL displaying as straight line
I am cropping my point cloud (.las) using PDAL, when i display my original point cloud it looks like this,
But after i crop it, the output looks like this, i.e. a straight line in viewer mode.
Here ...
- 2,249
5
votes
1
answer
142
views
Is there a major drawback of working with compressed LAZ vs. the uncompressed LAS?
Compressed LAS pointclouds (LAZ) are significantly smaller than the uncompressed ones (I observe a compression factor of x4 - x5). Since point clouds are often large files, this is a substantial ...
- 1,622
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20
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Some points are missing after using LAS classification and filtering points based on clarification and rewrite into a new file
I need to save .laz file that have only point cloud data corresponding to water classification. I used following code, it works. But it significantly reduce number of points from original file.
import ...
- 27
0
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0
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54
views
Convert LAS tool hangs at 2%
I'm trying to convert LiDAR data from .LAZ to .LAS using the Convert LAS tool in ArcGIS Pro, but it always stops at 2% and is never able to complete the decompression. Does anyone have any thoughts ...
- 13
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31
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Point cloud export
I have a point cloud file (*.laz) and when I import it to QGIS I get 5 sublayers. I want to export just the sublayer that is called ground to DXF (AutoCAD), but can't manage to do it. When I export it ...
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32
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TIN-Interpolation always crashing, user error?
Perhaps you can help figure this out, maybe i just overlook something.
So i have a point cloud which a imported from a lidar-data-file (laz).
Now, to generate a raster data set, i planned on using the ...
- 1
0
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0
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125
views
PDAL: Unable to open stream for ' '
I tried to run a batch process for pdal pipeline, however I always get a en error:
PDAL: Unable to open stream
Below is the pipeline and the batch code:
{
"pipeline": [
{"...
- 1
1
vote
1
answer
104
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Potree : Save user interactions
I am a new user of Potree and I would like to know if anyone has already an idea or found a way to save a user's interactions on Potree and use them again.
For example: if the user added an annotation ...
3
votes
0
answers
739
views
Problem with opening .las files in QGIS
For the last few days I tried to open .las Files from my work into QGIS. I have heard that the newest version of QGIS is able to open .las .laz files without any problem. The problem is that the ...
- 39
1
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138
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PDAL colorizing LAZ with GeoTIFF
I understand the example from PDAL workshop and it works well. However since I puzzle around with some data and find most effective way to use it I thought I might ask for some opinions here.
I do ...
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1
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0
answers
125
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entwine build produces a strange value for bounds in ept.json
I am relatively new to entwine.
In our project, we have a requirement to build entwine from Laz dataset in EPSG:4326.
I understand it might sound weird that we have this dataset in geographic ...
- 11
3
votes
3
answers
2k
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Convert .LAZ to .LAS without LAStools or command line (QGIS 3.22.4)?
Is it possible to convert .LAZ to .LAS in QGIS (without LAStools)?
Tools such as r.in.lidar (GRASS) used for conversion of point cloud to raster require .LAS as input, but after much searching around, ...
1
vote
0
answers
124
views
Reclassify points within a bounding box with PDAL
I have a list of 3D bounding boxes manually drawn around noise points and I want to reclassify them as noise. One option would be to simply drop them but, in this particular case, I would want to have ...
- 111
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2
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2k
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Converting LAZ to LAS using laspy
I would like to convert .laz file to .las. I am using Python and I have installed laspy with lazrs extension.
I tried in Pyscripter (v4.0) following solution (this solution was mentioned here: Reading ...
- 490
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0
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240
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Turn point cloud into rasterized mesh with PDAL-C and it's API
I'm triyng to turn a point cloud into a mesh that's rasterized like the code in c# below describes but I have come to the problem that the filter delaunay does not work with a raster, only with a ...
2
votes
2
answers
458
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Converting shapefile to ASC or LAZ format
Eire/Ireland data is available to buy, and I have a sample file. It seems to be a zip of some files with SHP, PRJ, SHX and DBF extension.
I am trying to convert this data to LAZ format. I can open ...
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3
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1
answer
193
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Ground extraction from laz
I have got laz file without classification
However everything what I can extract with pdal is this:
Seems like the algorithm detects everything as ground. The code is following:
pipeline = [
"/...
0
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0
answers
59
views
Adding Point cloud in Qgis2three
Im trying to add a point cloud in "qgis2threejs". Im following this tutorial https://www.youtube.com/watch?v=EtnzS1Lg0bs&ab_channel=HansvanderKwast but when i add the ept.json-file ...
1
vote
1
answer
23
views
Add default classification to Esri ASCII Raster?
I have some .ASC data files from Wales Govt. LiDAR data. I converted it to LAZ using LasTools, but when I try to use the data in a third party app, I get an error saying that the data is unclassified....
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2
votes
2
answers
838
views
Writing LAZ file using laspy
I am new for handling lidar data. Actually I am using laspy for read and write laz file. I am using following syntax for writing LAZ file. It is created LAZ file on specified folder path but it took ...
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2
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0
answers
16
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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 ...
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1
answer
898
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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....
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3
votes
1
answer
253
views
PDAL crashes when trying to filter noise points from outliers filter
I have a relatively simple PDAL pipeline being used to process a bunch of .laz files.
{
"type": "readers.las",
"filename": "c:\\stuff\\10781001.laz"
},
...
- 5,671
1
vote
1
answer
83
views
GRASS GIS problem with r.in.pdal
I tried to import .laz files with:
for mydom in $(ls *.laz) ; do r.in.pdal input=$mydom output=$(basename $mydom .laz) method=percentile pth=90; done
and got this error:
Traceback (most recent call ...
- 23
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
...
- 1,023
1
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2
answers
181
views
Further compression of LiDAR data besides LASZip
I am looking for a way to compress files other than LASZip that may make the files a bit more smaller, is there an efficient way to do this?
Would zipping up a LAZ file further compress the file? Or ...
- 81
5
votes
1
answer
5k
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Accessing raw data from LAZ file in Python with Open Source software?
Is there anyway to access raw "LAZ" (not LAS) datasets in Python? I was trying to with ArcPy (I'd prefer not too), but it doesn't seem able to access LAZ. I'd prefer to work with the raw LAZ file and ...
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2
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1
answer
1k
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LAS/LAZ parser for NodeJS
I cannot find any popular libraries for parsing (reading into memory) of LAS or LAZ (lidar data) files in NodeJS (desktop Javascript)
https://github.com/yuyou/liblas4node/blob/master/lib/liblas.js
...
- 5,007
2
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1
answer
373
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Optimizing workflow for FUSION's PolyClipData?
I have multiple large LiDAR datasets (.laz) from different areas, where I need to extract buildings. I have prepared a shapefile containing a buffer around the buildings I care about, and are using ...
- 23
9
votes
2
answers
2k
views
Why did Esri create .zlas compressed LiDAR files instead of adopting .laz?
I am talking about the Esri Optimized LAS file format for compressed LiDAR files (.zlas).
While the uncompressed format (.las) from ASPRS was adopted by practically the entire Remote Sensing and GIS ...
- 10.1k
3
votes
1
answer
1k
views
error: Compression support not enabled in liblas configuration
I am using liblas 1.8.1 and laszip 3.1.1 on Mac OS High Sierra. Both were installed using brew install <package>. I am looking to get information from a laz file using the following command:
...
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2
votes
2
answers
3k
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Converting LiDAR data (.laz) to DSM in .asc format
I'm looking to convert a LIDAR scan in .laz format into a DSM in ASCII Grid format, in order to calculate RF propagation in an urban environment from a given transmission location (bonus: converting ...
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1
vote
1
answer
814
views
Batch processing las files with LASzip from QGIS?
I am using QGIS 2.16 version. I added LAStools plugin and executed batch process, in a way that I have to write each filename in the output field. Is there any automatic process to get outputs with ...
- 11
1
vote
1
answer
428
views
Difference in the elevations for the same building on two DSMs saved in *.asc and *.laz formats
The following question concern the same type of data as the one I've asked in Differences in the longitude and latitude between a LiDAR DSM and an optical image.
Basically, I've downloaded a tile of ...
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13
votes
3
answers
52k
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Converting LiDAR files from LAZ to LAS format
I'm trying to convert LiDAR files from the LAZ format (the compressed version) into LAS (the uncompressed version) using LASzip software.
However, I am not really sure how it works. I created a new ...
- 287
3
votes
1
answer
1k
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Finding the origin in .laz file with LAStools
I obtained a .laz file, which I used lasinfo and las2txt to view the records.
Scale Factor X Y Z: 0.00100000000000 0.00100000000000 0.00100000000000
Offset X Y Z: 22717....
- 195
2
votes
2
answers
1k
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Laz LiDAR files displaying extremely long thin line of points
I am having difficulty properly visualizing aerial LIDAR data from the csc.noaa.gov source.
Taking any of the .laz files, the point cloud displays as an extremely long thin line of points. Zoomed in, ...
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