Questions tagged [laz]

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

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24 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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2answers
119 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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1answer
44 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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28 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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1answer
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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0answers
23 views

Unzipped LiDAR LAZ files now I have +3,000 folders each with its own LAS file

I am new to using LiDAR. I recently downloaded a massive amount of LiDAR. I unzipped using the LASTools, but now I have +3,000 folders, each containing a LAS file. Is there a trick to getting all of ...
2
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2answers
262 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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0answers
15 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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1answer
261 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....
3
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1answer
143 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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1answer
53 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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1answer
534 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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2answers
84 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 ...
5
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1answer
4k 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 ...
2
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1answer
834 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 ...
2
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1answer
265 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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2answers
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 ...
3
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1answer
877 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: ...
2
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2answers
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 ...
1
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1answer
695 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 ...
1
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1answer
370 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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3answers
45k 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 ...
2
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1answer
837 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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2answers
986 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, ...