Questions tagged [laz]

It is the compressed version of lidar las files from the open source software LASzip

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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 ...
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1 vote
0 answers
33 views

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 vote
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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 ...
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  • 11
2 votes
3 answers
186 views

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, ...
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0 votes
0 answers
73 views

Layers not shown on potree

I'm trying to use my las files in potree I've tried to convert them potree converter 1.7 and 2.1 then I deployed them in Apache and also tried Xampp but none of those worked When I try on potree 1.7 I ...
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1 vote
0 answers
39 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 ...
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0 votes
2 answers
671 views

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 ...
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  • 490
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0 answers
113 views

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 ...
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2 votes
2 answers
235 views

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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2 votes
1 answer
80 views

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 = [ "/...
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0 answers
32 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 ...
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1 vote
1 answer
20 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
513 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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  • 21
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 ...
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0 votes
1 answer
694 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....
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3 votes
1 answer
179 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" }, ...
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1 vote
1 answer
63 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 ...
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-1 votes
1 answer
759 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 ...
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  • 829
1 vote
2 answers
108 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 ...
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5 votes
1 answer
5k views

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 votes
1 answer
1k views

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 ...
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2 votes
1 answer
305 views

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 ...
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  • 23
7 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 ...
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3 votes
1 answer
964 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 views

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
749 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 ...
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1 vote
1 answer
399 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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  • 946
13 votes
3 answers
48k views

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 ...
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  • 287
2 votes
1 answer
976 views

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....
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  • 185
2 votes
2 answers
1k views

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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