Questions tagged [lastools]

Software for LiDAR processing tools.

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59 views

Failed to install Potree on Ubuntu 20.04.1 LTS

I am trying to install Potree on my computer and I am stuck. I am following these instructions: $ sudo apt-get install python-software-properties git $ sudo apt-get install build-essential cmake g++ $ ...
1
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0answers
25 views

Modeler - output of first algorithm not going to second one and so on

I've a model with subsequent steps of LAStools algorithms. Individually they work well, but in the modeler I get only the first output, and no more. It seems like the second algorithm is not taking ...
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1answer
48 views

Shift or replace_z values from ALS LiDAR scans

I have ALS LiDAR scans that I merged into a single file and classified ground points. I'm trying to 're-scale' the Z/height values but without actually normalizing them.. What I'd like to do re-scale ...
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25 views

Defra LiDAR - Convert DTM to PointCloud?

Defra has DSM and DTM data for Blackwell in Birmingham, but no Point Cloud data. I am trying to get LiDAR Point Cloud data to build a golf course model (in TGC2019) for Blackwell, and this uses ...
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1answer
41 views

How to normalize a large point cloud using lasheight and a .tif DTM?

I am normalizing a large point cloud (>16 GB), for which I'm using a preprocessed DTM that I store as .tif. For smaller amounts of data, I would use an R script that lets me do this: library(lidR) ...
2
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1answer
67 views

Different results in metrics calculated with LAStools and lidR

I have canopy height model calculated from high density TLS data on 60 by 200 meter plot. I tried to calculate voxels with LAStools and lidR and got significantly different results. I was wondering if ...
2
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0answers
40 views

Calculate average elevation value in LAS files in a specific area [closed]

I need to calculate the average elevation and its standard deviation of some buildings and parts of roads using LAS files. I want to be able to consider only the points that are within a polygon in a ...
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0answers
29 views

LiDAR data denoising algorithm complexity

I want to remove outliers (noise) from LiDAR data. Currently I'm using the same algorithm as LAStools: The LAStools software version 171215 implements a straightforward outlier removal ...
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0answers
66 views

las2dem, command not found in terminal

I am trying to use the command las2dem in terminal (Ubuntu) to create a DEM with various las files but I only want to conserve the points classified as Ground. I'm using this command: las2dem -i file....
2
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1answer
101 views

Georeference a LAS file with txt2las using a Geomedia coordinate system file (.csf)

I need to transform a file in a .csv file into a LAS file. I have a LiDAR data folder, in this folder I have these files: A .csv file that contains the the point data Some metadata files (schema, ...
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1answer
11 views

Running lasground on input cloud produces no visible effect in lasview?

Running lasground on input cloud produces no visible effect in lasview? It runs and writes an output file, which seems unchanged from the input file, when viewed in lasview. What could be wrong?
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125 views

Convert .las file with LAStools in QGIS

I get the following error when trying to convert a .las file using las2txt with the LASTools plugin: My system is set to UTF-8. QGIS code revision: 4470baa1a3 Qt version: 5.11.2 GDAL version: 2.4.1 ...
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0answers
12 views

Convert point cloud dataset with RGB encoding to FBX format

Hope you all are doing good. I have a point cloud dataset with RGB encoding. I need to convert it to FBX format. Is there any way to convert it? Is there any option available? Looking forward to ...
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0answers
88 views

Reproject LiDAR from Lat/Long to NAD83 with LAStools not working correctly

I'm trying to reproject a NOAA las file from Lat/Long to State Plane NAD83 using las2las. When I unpack the laz file as an las without specifying input or output coordinates it comes into GIS in the ...
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0answers
33 views

Tears when using LAStools lassplit

I have just started using QGIS and im trying to create a DEM from laserdata using LAStools. I have to split the laserdata since im not using a premium LAStools, but when i do i get these tears where ...
2
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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 ...
1
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1answer
117 views

LAS file bounding box is oversized after using lasnoise?

I have a few .las files that I am trying to use further. They have some far away noise points that I removed using LAStools lasnoise. It seems like the noise points are removed, but the bounding box ...
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0answers
67 views

How to solve cannot alloc point_buffer error LAStools?

I have just installed LAStools in my QGIS 3.x version. I have already managed to visualize the point cloud through the lasview tool. Now, I am having problems trying to classify Ground points from the ...
0
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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....
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0answers
155 views

Installing LAStools in QGIS 3.4

I am trying to install LAStools for QGIS3.4. I installed the plugin, downloaded LAStools and also wine. But if I try to run it for lasview, this is the error I get: Processing algorithm… Algorithm '...
2
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1answer
234 views

Extracting (big) rocks from LiDAR data

I have a .las file and want to show the outline of the big rocks located in this area. So far I have done the following: Obtain a ground model from the .las file including the rocks. Calculate ...
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1answer
338 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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0answers
60 views

error message“system cannot…”

After several intents to reinstall everything (even qgis3.8.2 zanzibar), and verify the path (several times) for the lasstools plugin, still cannot use it, as consequence of the error message the ...
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0answers
581 views

LASTools path not found in QGIS 3.6.3

Forgive me if this is a duplicate, but I am having trouble getting LASTools to run in QGIS 3.6.3 after following the installation instructions and searching on Stack Exchange. I have installed the ...
1
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1answer
134 views

Retrieve the elevation from a point cloud with lastools?

I have a general question about how can I get the elevation (z) data from a pointcloud (las) along a trajectory. I have a shape file with x, y coordinates and I have the related .las files. And I am ...
2
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2answers
1k views

Using LAStools to repair headers for several LiDAR files?

So, I have 21 LiDAR files with incorrect information in their file headers. For example, when I import a single file into R using the following code, I get several warnings saying that there are no ...
2
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1answer
3k views

LAStools plugin in QGIS: ''The system cannot find the path specified."

I'm attempting to convert LAS files to a multipoint file using QGIS methods. I've found some documentation that suggests that v3.2 and up has LAStools available as a plugin so I downloaded the latest ...
9
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3answers
1k views

Difference between LAStools, libLAS and PDAL?

After many readings, I'm still confused about the difference of use and the aims of the following tools for LiDAR data processing and manipulation: LAStools, libLAS, and PDAL. My understanding so far ...
1
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3answers
401 views

Maximum number of returns per laser pulse in airborne LiDAR?

What is the maximum amount of returns a discrete aerial laser scanner is capable of recording? For example in a LAS 1.2 metadata under Point Data Records there is the category 'Number of Returns' ...
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0answers
69 views

Downloading LASTools on Windows 10, QGIS 2.18.24 - Error Message [duplicate]

Following the instructions on this page; How to install LAStools toolbox in QGIS I came across this error when I tried to define the path to my LASTools folder in the QGIS Processing Toolbox Menu [C:\...
2
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1answer
410 views

Choosing LiDAR tiles with vector data using LAStools?

So the problem is that I have a huge amount of LiDAR tiles (in .laz format), but need only part of them that are within the borders of the city. When I load all the tiles to LASTools, I have ...
1
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2answers
1k views

Failed to install Potree on Ubuntu 18.04 Bionic

I am trying to install Potree on my computer and I am stuck. I am following these instructions: $ sudo apt-get install python-software-properties git $ sudo apt-get install build-essential cmake g++ $...
0
votes
0answers
66 views

Projection problem shapefile / layer created with LAS tools [duplicate]

I am a beginner with QGIS and I have been working on creating layers with LAStools and shapefiles of the city of Rio de Janeiro. Both data are provided by the city, so shouldn't contain any error. My ...
3
votes
1answer
1k views

Converting DEM to LAS file? [duplicate]

Is there a way to convert a DEM raster to a .las file using open source software and/or any tools that come along with a complete ESRI license? I have been able to achieve this using the LAS Toolset ...
0
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1answer
64 views

access r.in.lidar through pyGIS console [duplicate]

How can I access the r.in.lidar algo with the pyqgis console? i tried to import processing and algolist but r.in.liad under the GRASS GIS algo does not get listed. Also Checked the options iunder ...
8
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2answers
8k views

Installing LAStools in QGIS 3.0?

I don't know how to install LAStools in QGIS 3.0. In QGIS 2.18, you can incorporate it as a provider in Processing -> Options-> Tools for LiDAR data (for example: Installing LAStools in QGIS 2.4?). ...
2
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1answer
2k views

Converting LiDAR .las to .xyz with LAStools outputs incorrect projected coordinates?

I have an application that can import terrain data in an XYZ text format where X = latitude, Y = longitude and Z = elevation. I am trying to convert a LiDAR .las file to this format using las2las. ...
2
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2answers
463 views

LAStools menu seems to be incomplete in QGIS?

I am using QGIS 2.18.2 Las Palmas on a MacBook Pro running OSX 10.13.1 High Sierra. I followed Martin Isenburg's instructions how to install LAStools toolbox in QGIS and the LAStools menu is available ...
1
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1answer
839 views

Classifying LiDAR data to mid vegetation using LAStools?

I want to classify LiDAR vegetation points in low and mid vegetation, using LAStools. High vegetation is simple to get, using top of canopy (first return), but how about low vegetation, and mid? ...
2
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0answers
709 views

LAStools errors in QGIS: 'cannot open lasreaderlas with file name .las', 'could not open lasreader'? [closed]

I am experiencing some problems with LAStools. I have two QGIS separate installations: 2.14.17 is a standalone installation and 2.18.11 is a Osgeo4w installation. I have followed the procedure to ...
-2
votes
1answer
767 views

Seeking open source alternative of Las Tools [duplicate]

I am finding any open source alternative of Las tools , i Google but i found las Utitly which is also not the Open source alternative But i want open source alternative of Las Tools,
2
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1answer
1k views

Using Python to send arguments to LAStools basics

I'm currently trying to develop a LAStools specific routine, setting all the parameters for lasheight then using the output of that to run lasclassify. The closest thing I've found to being able to ...
2
votes
3answers
886 views

Creating DEM from multiple .las files using LAStools in ArcMap?

I am attempting to create a DEM for a raster large dataset, with over 500 .las files. Within the las2dem tool, within the LAStools toolbox there is not an option to select an entire folder, nor can ...
1
vote
1answer
2k views

LASTools' lasview gives no output in QGIS? [closed]

I've downloaded the latest LASTools into the current folder in QGIS and have tried running lasview on a few .las files I have on hand. As far as I can tell the files are georeferenced but I am not ...
1
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0answers
85 views

How to extract and export “raised field” LIDAR objects?

I'm working on Windows 10. In input, I have a .LAS "GROUND_only" LIDAR point cloud (4 millions points). We're interested in geomorphological microstructures called raised field (ground elevation due ...
2
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1answer
1k views

Is there any documentation on how to change the user interface of Potree?

Has anyone found or created any information regarding the different user interfaces of Potree? I have created LiDAR portals using the LAStools laspublish tool to create Potree sites, but cannot see ...
1
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1answer
643 views

Using ModelBuilder to iterate through LAS files using custom LASToolbox?

I'm trying to use ModelBuilder to iterate through a folder containing 25 usgs .las files and run 4 custom geoprocessing tools from the LAStools toolbox available on github. I am able to successfully ...
3
votes
2answers
1k views

Manually editing a LiDAR cloud to remove non ground points

I've recently been tasked with cleaning up a LiDAR file of a river where I need to remove trees, shrubs and power lines that run right across the river. I was looking into LAStools but it has a limit ...
1
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1answer
1k views

Keeping only ground points (class 2) with lasground in QGIS 2.14?

I want to keep only the LiDAR ground points in a las file, using the lasground tool from LAStools within QGIS. In QGIS Chugiak (2.4) there used to be an option to "keep class 2", but I don't know how ...
1
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1answer
2k views

Merging multiple las files? [closed]

I want to merge 10 las files into one, and I am having problems with lasmerge of lastools. It isn't able to deal with such a high number of points (average of points per file almost 4 million of ...