Questions tagged [laz]
It is the compressed version of lidar las files from the open source software LASzip
20
questions
0
votes
0answers
18 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
votes
2answers
56 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 ...
0
votes
0answers
13 views
GroundFilter.bat creating a .lda file and a 1 KB laz file
I ran the GroudFilter.bat FUSION script to create a ground filter file, but the script is creating a .lda file with a 1 KB laz file. How can I make the GroundFilter.bat script to create a laz file. By ...
2
votes
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 ...
0
votes
1answer
83 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
votes
1answer
114 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"
},
...
1
vote
1answer
35 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 ...
-1
votes
1answer
337 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
vote
2answers
63 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
votes
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
votes
1answer
705 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
votes
1answer
215 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 ...
6
votes
2answers
1k 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
votes
1answer
795 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
votes
2answers
2k 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
vote
1answer
641 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
vote
1answer
341 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 ...
12
votes
3answers
40k 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
votes
1answer
726 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....
2
votes
2answers
870 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, ...
