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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Automatically Recognised Targets for Combined Laser Scanning and Photogrammetry

I'm currently performing an engineering honours thesis on terrestrial photogrammetry and laser scanning in Archaeology. Both methods will be used to document a single location first and analysis will ...
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89 views

Transform point cloud from ENU (east, north, up) to LLA (lat, long, alt)

I am having point cloud (xyz) in ENU format. I need a pipeline to convert all the points in the point cloud to geocentric LLA (lat, long, alt) coordinates. Is there any tool using which I can achieve ...
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31 views

Which formula could I use to increase the vertical exaggeration of a pointcloud?

I have a pointcloud of a very flat area! I would like to exaggerate the Z values in the same way software visualisations do - e.g ArcScene My method would be to create a raster DEM from the ...
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59 views

How to define the path which I surveyed 4 times?

I did a kinematic survey of a path. I automatically collected data with GPS every second while I was walking on the path (walking speed is not constant). I did 8 repetitions on the same path. Now I ...
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Point data grouping based on location + huge dataset in QGIS

I need community help to solve my puzzle. I have one huge dataset of points that represent places where a set of trucks stopped. Points go to the database if the reported speed of a truck was 0. The ...
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452 views

convert a raster (.tif format) into a mesh

I want to use the cloud to mesh registration tools in Cloud Compare to align a raster (.tif format) to a point cloud (.las format) for surface differencing. what is the best raster to mesh conversion ...
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44 views

LiDAR Lines Having Erratic Patterns [closed]

I have processed a LiDAR data and produced LAS files for an area that was flown by my team. We have processed some areas and the outputs were pretty good. I observed that we are now getting erratic ...
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105 views

QGIS: Extract rows of grape vines from inter-row vegetation using a 3D point cloud

I have some multi spectral imagery (raster data) from a UAV of vineyards in Victoria, as well as corresponding 3D point cloud (also raster) of the vineyard topography, based off ultrasonic sensing, ...
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119 views

Intersect raster or laz (pointcloud) with vector polygons [closed]

I am a vector trained GIS person and wish to add the value of a pointcloud to my vector data. A friend of mine suggested cloudcompare but said it was also possible using my beloved QGIS. I work with ...
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300 views

Flipped (Y-axis) Raster from point cloud

I have been working on a project where I need to create rasters from irregularly spaced point clouds. I am resampling my point clouds to a regular 0.25 cm grid using a nearest neighbor method ...
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557 views

Help with PDAL install on windows [closed]

I am trying to install PDAL from github according to the following instructions: Clone into a source directory: git clone https://github.com/PDAL/PDAL PDAL Make a build directory: mkdir PDAL-build ...
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83 views

Getting points from a particular section of point cloud data [closed]

I have a las file and I'm trying to analyze it using ArcGIS/ArcPy. Are there any built-in functions that I can use (maybe using a tool or las data property) to isolate a chunk of points? I want to be ...
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37 views

Removing coincident points with z values greater than minimum [duplicate]

I am trying to run a spline interpolation on some terrestrial LiDAR data, but it keeps failing (I'm getting error 010235 - returned error from spline process and error 010067 - error executing grid ...
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3answers
301 views

Assigning class codes for LAS files? [duplicate]

I have LAS files with code 0 - never classified. I have no other classes other than this. How do I assign class codes for my LAS file?
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2answers
390 views

Viewing a small pointcloud in QGIS 3.0 3D Viewer

I have a pointcloud in postgis, imported using pdal pipeline and chipper to 600 points per patch. I have the pointcloud (only 5000 points) displayed in QGIS. How do I get QGIS to render in in 3D in ...
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1answer
154 views

Cropping a point cloud with PDAL also strips it off

Description of the problem: When cropping a .ply point cloud using PDAL pipeline: { "pipeline":[ "input.ply", { "type":"filters.crop", "bounds":"([52435....
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344 views

Which type of point cloud is more accurate: from airborne LiDAR or aerial photos?

I have been offered two types of point cloud for my 3D Project. The data will be used by the environmental agency in various projects e.g. flood-risk analysis, dyke conservation, and nature ...
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296 views

Formating PDAL Pipeline JSON for crop filter

I'm trying to crop out a section of point cloud using PDAL pipeline filter.crop function. Here's my JSON for pipeline: { "pipeline":[ { "type":"readers.las", "filename":"/data/home-...
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437 views

Subtracting two point clouds?

I have two point clouds (PCs): (i) PC-A (i.e. Reference PC or ground truth) and (ii) PC-B (i.e. Bare-Earth PC obtained through filtering) I want to subtract PC-B from PC-A to calculate commission ...
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1k views

Seeking open source point cloud software? [closed]

Just acquired a Geoslam Zeb-Revo for scanning our stockpiles and wondered if there was another option to process point cloud data?
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1answer
203 views

ArcGIS Raster To Multipoint Mac/OSX alternative

Is there an alternative to the ArcGIS Raster To Multipoint tool for Macs? The VIP thinning method is particularly of use. A comparative point cloud thinning/simplification tool to this would just as ...
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25 views

Is it possible to edit a dimension's data type from pdal?

I'm working in a viewer based in potree with entwine, and i want to have HeightAboveGround (HAG) as a additional information, without replace Z in the LAS data. The target is to show the elevation and ...
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112 views

Timestamp mismatch in the data recorded by Vlp16 with Ublox-M8T

Currently, I am working on Velodyne vlp16, for which I recently added UbloxEVK-M8T support. The setup is working fine but when I record the data from VeloView, the GPS timestamp is showing incorrect ...
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1answer
49 views

PDAL Filter output is same as input file

I've applied SOR filter using PDAL python.Below is the code snippet of the same, json = """ { "pipeline":[ "D:/Lidar_collect_3/output/output_1.las", { "type":"filters....
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337 views

Get all points from pointcloud where pointcloud is new Potree.PointCloudOctree(geometry)

I use potree to view my model I want to get list of all points in pointcloud to add event to each point depending on its index. Can I get list of all points without using measurement tools? Potree....
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1answer
434 views

Zooming to coordinates upon start up using Potree?

I am using the latest version of Potree (the version last updated 27/08/2018). I have converted my source LAZ data into Potree compatible LAZ tiles (using PotreeConverter.exe). I have huge amounts ...
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1answer
281 views

Performing kNN between two 3D sets of points (pointclouds)

I have two overlapping pointclouds, for this example I take the first 10, A[0:10] and B[0:10]. They are stored as tuples, [(x, y, z),...]. I want to compare the two based on their nearest x,y,z ...
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163 views

Colorize a point cloud in a web page based on a scalar field?

The issue: I have a a PLY point cloud file computed from a photogrammetric acquisition that has been processed in CloudCompare. The header look like: ply format binary_little_endian 1.0 ...
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127 views

Display and manage (CRUD) point cloud in (Geo)Django 2

I would like to use GeoDjango to Geolocate the place I will scan. Would start to 3D scans with a DIY lidar based on Arduino/Rpi. So far no worries. Then, The Goal is to save x,y,z as input in ...
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15 views

Vertical 3D Point Cloud visualisation [duplicate]

Not LIDAR data. I have a file with x,y,z,c in a csv I want a 3D representation of the points, with colour defined by c The data is vertical profiles. Any idea?
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448 views

Raw point cloud data to GIS format [duplicate]

I am trying to create 3D maps. I have raw 3D point cloud data but unable to convert it to any GIS data format such as GeoJSON. How should I store 3D information in GeoJSON format?
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1answer
113 views

Batch ENVI IDL PointCloudFeatureExtraction results in unprocessed areas [closed]

I have an IDL-ENVI code to batch PointCloudFeatureExtraction for lidar tiles across a large area, however, when run, the output results in lower areas of each tile as "unprocessed". So my question is ...
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46 views

Point cloud/image comparison?

I used MATLAB software to classify point cloud data into 3 classes; (1) main; (2) protrusion and (3) recess. In MATLAB I assigned a distinctive color to each class to differentiate between classes (...
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1k views

How to generate DTM from point cloud data? [duplicate]

I have point cloud data obtained from drone. I need to generate DTM out of it. How can I generate and I checked options in ArcGIS and QGIS. I was not able to find any.Could anyone suggest a method to ...