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Questions tagged [point-cloud]

A point cloud is an unstructured set of points, each defined by x,y,z co-ordinates.

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Open platform to visualised bathymetry LiDAR

I have point cloud data that I want to visualise on an open platform, which I can extend tools upon to investigate further. I was wondering if any offer a visualisation like below, where the ...
guest_231213's user avatar
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Issue with Inactive Volume Analysis Toolbar in TREND-POINT

I am currently using the TREND-POINT software to perform volume analysis using mesh after loading two txt format point cloud data files. However, the buttons in the volume analysis toolbar are grayed ...
JULIETTE's user avatar
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LiDAR point cloud has no classfications [laspy], trying to classify and filter ground points

I have a .las file of data collected on a road, and I would like to get only the ground and points 'below' ground (potholes, other indentations, for example). However, when I load the data, it seems ...
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Point Cloud Processing Tools on MacOS

I am trying to access the native Point Cloud Processing tools, developed by Lutra Conslting and added to QGIS 3.32 (https://www.lutraconsulting.co.uk/blog/2023/05/30/pointcloud-qgis-processing/). I ...
SamH's user avatar
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Converting las to pnts for Cesium

I try to convert .las file to .pnts with tileset.json to be able to load it to Cesium viewer. I convert las using py3dtiles. But despite different conversion methods I get my point cloud placed ...
Maryla's user avatar
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How to set the block size parameter for prepare a high point-density PointCloud dataset for training a model with ArcGIS Pro

I have a mobile point cloud dataset with following information: point density: all returns 126.91 last only 117.75 (per square units) Point spacing: all returns 0.09 last only 0.8 (in units) For ...
Anahita Kp's user avatar
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PDAL Translates Removes LAS Attributes

I am using PDAL (pdal 2.7.1 (git-version: Release)) "Translate" for assigning a CRS to my ALS pointcloud (format LAS; point format 6). However, everything works fine, but some Attributes (...
terms of service's user avatar
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QGIS/PDAL: Selecting/tagging equally-spaced subset of point data

I have a set of high-density bathymetric point data with a maximum density of 30m. I now want to select or otherwise differentiate a subset of these points, evenly distributed throughout the set at an ...
ivyallie's user avatar
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Doing simple manual classification of LAS using QGIS

Are there any basic tools for lidar classification in QGIS? Id like to do simple function like reclassing single points, classing points inside a fence or above a line. something similar to the basic ...
LidarBeaver's user avatar
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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
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QGIS: batch assigning CRS for point clouds

I got a bunch of LAZ compressed point cloud tiles (over 300). They don't have a projection assigned. I want to assign the correct projection (I know the files are in EPSG:25832) with the action "...
Tobias Schula's user avatar
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Problem with SAGA batch processing

I have a series of point clouds in LAZ format that contain points identified as ground. I want to interpolate these points with the Multilevel B-Spline algorithm of Saga GIS and export the clouds to ...
Gerardo Jimenez's user avatar
4 votes
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449 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
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Add virtual pointcloud (vpc) from https location in QGIS

I'm trying to add a virtual point cloud file from a https-server in QGIS 3.35.0, but it seems that it only supports .copc.laz and .ept.json. I can open the vpc-file if I put it on a local directory. ...
MattiasN's user avatar
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QGIS Elevation profile using Point Cloud and Polygon layer with Z value

I'm trying to use the Elevation profile tool with a point cloud and a polygon layer (with Z values). I wish to use the "capture curve" to view a section and I expected to see the polygon ...
nir 's user avatar
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Untwine error: Can't refer reader for a LAS file (Point Cloud File)

I was trying to import a las file to QGIS 3.28.12 Firenze. It really take me sometime to attempt to load the file but still failed to display all the points. So I downloaded a point cloud file for a ...
Benjamin Lau's user avatar
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1 answer
262 views

Reclassify points in a LAS file using laspy

I am trying to change the classification of all points in my las file above a certain height (z value) from 2 (ground) to 1 (unclassified). I wrote the following code to do this: las = laspy.read(&...
Tahrir Siddiqui's user avatar
2 votes
2 answers
94 views

Filter just the last return from a point cloud

At 3.32.3, the Processing Toolbox > Point cloud extraction > Filter tool does not include the ability to select only the last return in its list of filter expressions. This functionality is ...
Stu Smith's user avatar
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Geolocating a PCD

I have some simulation software that generates values in real 3D space. Because the output is in real space, it's being stored in the LAS format. However, LAS is not really designed to store arbitrary ...
KTM's user avatar
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PDAL translation seems to be causing a scaling

I'm trying to georeference a .laz pointcloud in order to correctly show it in QGIS on a map. I notice however that while using the pdal transformation, there is a change in the scale of the point ...
RobbeVl's user avatar
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ArcPy filter and export LAS dataset

Building upon ArcPy IDW interpolation with LiDAR point cloud data, suppose I want to select certain classes in the las file and then export the final output in its original format (.las), how do I do ...
User2010's user avatar
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ArcPy IDW interpolation with LiDAR point cloud data

There are several questions such as 1, 2 etc on interpolation, but, when I implement the same procedure to calculate digital terrain model from point cloud I get an error: las_path = r"C:\Users\...
User2010's user avatar
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Apply custom vertical datum transformations to point cloud

My goal is to write a script that can add the geoidal undulations contained in a TIFF file (local geoid model) to a point cloud. I wrote the script below in Python that should perform this task using ...
tiagosa's user avatar
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Filtering LiDAR points by elevation/height

I am trying to prepare training data for a deep learning model. The objective is to be able to identify trees in an urban area. Properly classifying the points in my training data would be a lot ...
amcameron's user avatar
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Esri deep learning model is not particularly effective

I am using Esri's tree classification deep learning model, in conjunction with the Classify Point Cloud Using Trained Model tool, to classify LiDAR point cloud data in an effort to develop a tree ...
amcameron's user avatar
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1 answer
349 views

Creating multiband raster from .las file using PDAL

I am quite new to creating rasters from point cloud (.las) files. Basically, I would like to use PDAL and its writers.gdal stage to write a raster with two bands. The first band should be written ...
user224802's user avatar
1 vote
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108 views

Rename LAS point cloud classification

I'm looking for a way to change a las classification name. Want to change class 64 unknown to class 64 Culvert. How do I change the name of the las class? Is it best to do it within the LS header?
Shaun's user avatar
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3 votes
1 answer
204 views

Getting the footprint of LAS file in QGIS

I can get the extent of a LAS file with: #Create a pointcloudlayer lasfile = r"C:\GIS\data\testdata\22D054_684_39_7575.laz" pc = QgsPointCloudLayer(uri=lasfile, baseName="test", ...
Bera's user avatar
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Classify Pointcloud using thematic layer with lidR

I want to use lidR to classify points within a point cloud using a few thematic shapefiles. This includes buildings, vegetation and cars. For this I use the classify_poi function, which works for ...
FelixB.'s user avatar
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How to speed up my PDAL pipeline script?

I'm creating an app for point cloud processing. I've made a pdal script with Python and I have some trouble with the cpu usage and processing speed I've made a pipeline for las processing, with some ...
Nicolas Guibal's user avatar
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1 answer
65 views

Point Cloud Processing algorithm for QGIS 3.30

Has anyone installed the new Point Cloud processing capability in QGIS that was announced recently? Apparently it is in the Github Master but I am not sure how to do this.
Colin Mazengarb's user avatar
1 vote
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127 views

How to combine ortho imagery and a DSM to make a pointcloud

I can create a VRT with four rasters and convert this to GTiff. But I don't seem to be able to create the point cloud from the GTiff. I have tried: pdal translate input.tif output.las --reader gdal ...
Alan's user avatar
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158 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
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145 views

How to average a point cloud object groups to a single centroid point?

I have a point cloud data. What I want to do is count how many objects are there in the point cloud. Suppose there are many cylindrical objects in my point cloud. What I am thinking of doing is to ...
SaFaL's user avatar
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6 votes
2 answers
2k 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
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2 votes
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108 views

Keypoint generation in 3D point clouds with Deep Learning

I have a huge dataset of 3D point clouds (each point consists of X,Y,Z coordinates) and another dataset with keypoints (also X,Y,Z) which lie on quite recognizable structures in the point cloud. As a ...
nmb's user avatar
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1 answer
376 views

Convert colorized point cloud to colored raster

Most of the tools that that I have seen convert a point cloud to a DEM. I am more interested in a GeoTiff that looks like a satellite imagery rather than an elevation map. What tool do I use to do ...
youssef khaky's user avatar
1 vote
0 answers
276 views

lidR: Clipping LAS files with a polygon shapefile using clip_roi

I'm trying to clip a LAScatalog (containing several .las files) with a shapefile (containing multiple polygons). I tried using clip_roi function, however getting an Error: Z only allowed for 3 or ...
TAT's user avatar
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1 vote
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QGIS Import Fails with Invalid Data Source Error Loading LAS file: "Global encoding WKT flag not set for point format 6 - 10." [duplicate]

I am trying to import some .las files in QGIS 3.28. I am successful with other files but for one file when I drag the file and drop it in the QGIS interface, it produces the following error: Invalid ...
Arman's user avatar
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31 views

Is there any way to identify what does the value in point cloud text file represent without contacting the one who generated it?

I have a point cloud text file that I obtained from the internet and it contain 6 type of value. I assume the first three value represent xyz values but I do not know about what the other three ...
Gaby John's user avatar
2 votes
1 answer
166 views

lidR: "Argument is not a LAS object" when using catalog_apply

I am using the lidR package to read lidar data (LAZ format), then using clip_roi() and normalize_height() to process the data for the segment trees function. These functions are being executed within ...
zaguy22's user avatar
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6 votes
1 answer
358 views

QGIS layer properties window oversized

With the latest version of QGIS (3.28.2) with Windows 64 bits, with the new point cloud layer: the layer properties window is oversized in the height. This hides the bottom buttons (OK, Cancel...), ...
gvatin's user avatar
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0 votes
1 answer
187 views

Remove point cloud overlapping flight line with a Python script

I have a LiDAR file (.las) corresponding to a topographical survey that I was able to carry out. However on this file we can see an overlap of points due to the percentage of flight overlap for the ...
Nicolas Guibal's user avatar
1 vote
0 answers
249 views

How to limit memory usage for pdal to import LiDAR data

While trying to import LiDAR pointcloud data in .las format (my file is 38GB) to PostgreSQL using the pointcloud extension, I keep getting Killed after several minutes of the following command running ...
justsomeguy's user avatar
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0 answers
42 views

Point cloud is decreasing when adding in QGIS

I have a point cloud with coordinate information from Agisoft metashape software and I make the point clouds into the WGS84 coordinate system at Agisoft. But when I try to use the point cloud in QGIS ...
nur92's user avatar
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0 answers
721 views

Export LAS file to XYZ and retain RGB values

I am currently trying to import LAZ LIDAR data into ArchiCAD (a 3D modeling software) for an architectural project. Using QGIS 3.22.11 and LAStools las2txt I have successfully exported the LAZ file as ...
Emilio's user avatar
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0 votes
1 answer
66 views

How do LiDAR and photogrammetry DTMs differ?

Recently, I received two temporally distinct DTMs of a particular area processed with photogrammetry. The datasets were acquired about one year apart and no landscaping activity occurred at the site ...
hmnoidk's user avatar
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662 views

Calculating the outer boundary of point clouds and export it as shapefile

I want to calculate the outer boundary of bunch of point clouds. Going through different answers from stack I made this messy kind of solution, which works but is insanely slow. for 208 files(~117gb) ...
SpatialAnalyst's user avatar
1 vote
0 answers
90 views

How to visualize the labels from a Point Cloud in QGIS?

I have a point Cloud (Las file) and I wolud like to see/visualize the labels (Z values). There´s a way to do it in QGIS? (I´m using QGIS version = 3.24)
Paulo Martinho's user avatar
0 votes
1 answer
209 views

Crop a large point cloud with GeoJSON defining the geometries of sub point cloud

I have a large point cloud (a city model) and would like to get the point clouds of every building in the city. I already have the GeoJSON file with the geometries of every single building in the city....
Lucas's user avatar
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