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Questions tagged [laz]

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

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13 votes
3 answers
56k 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 ...
June's user avatar
  • 287
9 votes
2 answers
3k 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 ...
Andre Silva's user avatar
  • 10.3k
6 votes
2 answers
1k 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 ...
Honeybear's user avatar
  • 2,464
5 votes
1 answer
6k 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 ...
Cody Brown's user avatar
  • 4,387
4 votes
4 answers
392 views

How can I find the Point Cloud Tools in QGIS 3.34 Mac Version?

I just downloaded the QGIS Latest Release Version 3.34 (Prizren) for Mac to try the new Point Cloud tools, that should be natively available according to this post: https://www.lutraconsulting.co.uk/...
Enzo Baldini's user avatar
  • 2,337
3 votes
3 answers
5k 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, ...
sentient tea drinker's user avatar
3 votes
1 answer
335 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" }, ...
user890's user avatar
  • 5,733
3 votes
1 answer
1k 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....
goh's user avatar
  • 195
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: ...
Aaron's user avatar
  • 51.7k
3 votes
0 answers
2k 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 ...
PSKL's user avatar
  • 39
2 votes
3 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, ...
user25226's user avatar
2 votes
2 answers
4k 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 ...
CableBox's user avatar
2 votes
2 answers
1k 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 ...
Karthik's user avatar
  • 21
2 votes
1 answer
2k 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 ...
U2ros's user avatar
  • 5,117
2 votes
1 answer
446 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 ...
bird's user avatar
  • 23
2 votes
2 answers
963 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 ...
Steve Hibbert's user avatar
2 votes
1 answer
321 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 = [ "/...
Марина Лисниченко's user avatar
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 ...
Sanjay Somnath's user avatar
1 vote
1 answer
25 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....
Steve Hibbert's user avatar
1 vote
2 answers
264 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 ...
Scott4993's user avatar
1 vote
1 answer
104 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 ...
Petrichor's user avatar
1 vote
1 answer
888 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 ...
RAJESH KUMAR's user avatar
1 vote
1 answer
461 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 ...
Hakim's user avatar
  • 956
1 vote
1 answer
42 views

How do I filter out Unclassified points from a LAS file and generate contours and a .dem file in QGIS?

I downloaded lidar data from https://gis1.oit.ohio.gov/geodatadownload/ and imported a LAS file into QGIS. I want to generate contours and a .dem file from the Ground data. I have been able to ...
Matt25's user avatar
  • 11
1 vote
0 answers
72 views

How to create a virtual point cloud (VPC) with S3 URLs to read COPC files in QGIS 3.32?

I have been converting LAS files (pdrf 6) to COPC using QGIS 3.32. It then reads well in QGIS but doesn't once uploaded on AWS S3. The bucket is not public, so I have tried to input AWS_ACCESS_KEY_ID ...
Leo's user avatar
  • 701
1 vote
0 answers
366 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": [ {"...
David's user avatar
  • 11
1 vote
1 answer
316 views

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 ...
Imane Hammoudy's user avatar
1 vote
0 answers
377 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 ...
Kalle's user avatar
  • 41
1 vote
0 answers
210 views

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 ...
kswp's user avatar
  • 11
1 vote
0 answers
209 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 ...
Fabio Picchi's user avatar
0 votes
1 answer
531 views

What is the most efficient way to write COPC files with PDAL

I'm trying to convert a set of tiled .la[a|z] files into one massive copc.laz file. I have dozen of files and more than one billion points to process on a regular laptop with 11 GB of free RAM. I'm ...
JRR's user avatar
  • 9,464
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....
Sam Fleming's user avatar
0 votes
1 answer
273 views

Loading laz point cloud in QGIS error: Invalid Data Source

I have problems opening a point cloud laz file in QGIS 3.34.0 Prizren on Win 10, PDAL version 2.5.5, Python version 3.9.5. I have older "good" laz-files that I have no trouble opening in ...
Babel's user avatar
  • 72.9k
0 votes
2 answers
3k 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 ...
Rok's user avatar
  • 490
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 ...
dmjf08's user avatar
  • 1,273
0 votes
0 answers
85 views

Trouble reading LAZ downloaded from NOAA LiDAR database

I am attempting to download the raw point cloud of a LiDAR acquisition from NOAA's Office of Coastal Management's LiDAR database using R. The data download with out error, but when I read in the laz ...
Sean McKenzie's user avatar
0 votes
0 answers
117 views

Laspy LAZ exported files with extra dimensions and QGIS name mangling

I'm writing a LAZ file with laspy, and I include some extra dimensions named bx, by, bz and b. They are all np.float64 (I used the version 1.4 and point format 3). The file is properly created but ...
Florian Stasse's user avatar
0 votes
0 answers
92 views

Serve LAS/LAZ data from server to frontend

I have the following architecture: Frontend: Vue3 w. OpenLayers7 (Typescript) Backend: FastAPI (Python) WebMapServer: GeoServer 2.23 I would like to display LAS/LAZ LIDAR data through Potree and I'd ...
FloCAD's user avatar
  • 33
0 votes
0 answers
57 views

Incorrect loading of a .laz file in QGIS

I would like to open a .laz file in QGIS. This is probably not loaded completely. For example, no statistics are shown to me in the layer properties. Also, no ept.json file is created and the ept-data ...
ToSa's user avatar
  • 1
0 votes
1 answer
146 views

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 ...
Ahsan Mukhtar's user avatar
0 votes
0 answers
250 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 ...
sealark's user avatar
  • 13
0 votes
0 answers
117 views

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 ...
zrrrn's user avatar
  • 1
0 votes
0 answers
385 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 ...
creepercrack's user avatar