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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Stitching GPS Coordinates with the Point Cloud from mobile LiDAR

I have collected the herewith shared .las,gps,imu, and ins file from a mobile LiDAR unit. I would like to project it to the real world coordinate system so that I can overlap the Point Clouds with the ...
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30 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 ...
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23 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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62 views

How to georeference point cloud data that was no spatial information?

I'm working on a project right now that the final goal is to compare two DTMs of a glacier surface from different years to visualize the change over time of the glacial surface. The first DTM was ...
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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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Removing noise from point cloud with lidR package

I have unclassified Terrestrial Laser Scanning (TLS) point cloud data which has some noise. Is there a function in the lidR package which can be used to remove noise?
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41 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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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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55 views

Non-constant transformation of photogrammetric point clouds in R?

I have a process which attempts to register two forested point clouds using CloudCompare's Iterative Closest Point (ICP) algorithm. Often times, warping (especially in the vertical direction) occurs ...
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54 views

QGIS: Placing points relative to a specific coordinate

I have some delimited-text point data that is encoded as X,Y positions relative to a given coordinate. So, for example, 1 5 represents a point 1 meter east, five meters north of the origin coordinate. ...
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256 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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75 views

Volume calculation of CSV file

I have a CSV file with point cloud data of a terrain. How do I use QGIS to calculate the volume of the terrain? I tried using SAGA tool, natural neighbour, then use raster volume calculation. However,...
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Coarse Woody Debris extraction

I created very high dense point cloud of some forest plots using terrestrial laser scanner. Then removed points above 1.3 meter to see the coarse woody debris (Fallen dead trees). Attached is the ...
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356 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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64 views

Parallel optimization for query over LiDAR dataset

I'm using PostGIS + pointcloud to store a huge dataset of LiDAR point (2M patches of 600points) I query this database to obtain the altimetic profile between two points. At the moment I have a huge ...
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467 views

Why ground model from point cloud in Global Mapper is inaccurate?

I have a LAS file that I assumed was based on LiDAR, but it is actually based on ADS (airborne digital sensor) imagery, according to the body that captured the data. I load the file in to Global ...
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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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235 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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321 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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37 views

'Regular Points' vector layer in Bonn

I've downloaded the bonn version of QGIS. Using the 'regular points' vector analysis tool, I've set some 5m regular points over a field so that I can use the x,y coordinates to plot them and measure ...
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152 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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51 views

How to create a dense pointcloud of trees in ArcGIS?

I'm having a large dataset of forest polygons and would like to scatter individual tree locations over these areas. Here is how I have done this so far: In "Create Random Points" number of points has ...
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120 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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133 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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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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553 views

Installing PgPointCloud extension for PostgreSQL on Ubuntu Bionic

I'm stuck with the installation of the PgPointCloud extension for PostgreSQL. I found this article: https://connect.boundlessgeo.com/docs/suite/4.6/dataadmin/pointcloud/install.html But when I run ...
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119 views

PDAL error: “Couldn't create filter stage of type 'filters.cpd'”

I would like to use the cpd filter to transform a point cloud, but I am heading to the following error: RuntimeError: Couldn't create filter stage of type 'filters.cpd' which comes from the ...
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161 views

Visualizing extra bytes from LAS 1.4 in Potree?

I was wondering if it is possible to visualize the information that can be stored in the extra bytes of the LAS 1.4 file. This could be really helpful for validating features that have been calculate ...
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223 views

using GRASS on a .ply file

I have a point cloud (.ply format) that I got after using Structure from motion techniques (with MicMac). I would like to calculate its volume with r.report in GRASS. Will r.report work on a ply file? ...
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81 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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344 views

Georeferencing terrestrial LiDAR point cloud?

Recently I took a Faro Focus terrestrial laser scanner to a forested area and collected multiple scans for 12 fixed radius plots. Each plot had 5 GPS points collected within it in hopes to ...
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427 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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Editing LiDAR point cloud to remove noise/outliers present below and above ground?

I have "dirty" LiDAR data containing first and last returns and also inevitably errors under and over the surface level. (screenshot) I have SAGA, QGIS, ESRI and FME at hand, but no real method. What ...
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323 views

How to filter point cloud by flightline in R?

The lidR package in R provides a way to mark individual points in a point cloud with a flightline ID by using lasflightline(). From the documentation: Retrieve each individual flightline by ...
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1answer
98 views

How to incorporate stdmetrics in gridmetrics function?

I am attempting to feed the lidR gridmetrics function a list of metrics. I can generate the list of metrics within a function (following this example): myMetrics = function(z, i) { metrics = list( ...
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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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571 views

Open source approach to classifying and removing LiDAR points from overlapping scans?

The attached screenshot shows a LiDAR point cloud with significant overlapping scans. This point cloud tile is part of the MN statewide LiDAR dataset which has 25% scan overlap and 1.5 NPS. For many ...
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116 views

PDAL: Argument references invalid/unused stage: 'filters.voxelgrid'

I am running into an error when running pdal translate on Mac OS High Sierra: PDAL: Argument references invalid/unused stage: 'filters.voxelgrid'. This is the command I am using based on a PDAL ...
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111 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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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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340 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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4k views

Converting LiDAR point cloud to 3D mesh?

I have an unstructured point cloud of a street in LAS format (.las), scanned from a driving car. The point cloud also stores RGB information. Is there any software that can convert the point cloud to ...
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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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1answer
279 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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2answers
453 views

Finding tree canopy width using PDAL?

I want to classify (and separate) houses from trees (high vegetation) in point cloud data using PDAL. I use height filter for this purpose. Our high Vegetation lies in the range between 5 and 10 ...
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423 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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160 views

Creating filter stage of type filters.height using PDAL?

I use PDAL to find the height of points from LiDAR data. When I run the command: pdal translate myfile.las height.bpf height --writers.bpf.output_dims="X,Y,Z,Height;" It throws me the following ...
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496 views

How to import AHN data into Sketchup?

What is the best workflow to import a roughly 1x1 km area from AHN data (Actueel Hoogtebestand Nederland) into Sketchup Make? My goal is to create contours of existing buildings and structures. AHN ...
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379 views

Import point cloud (.ply) into PostgreSQL ( PostGIS )

I am trying to import some point cloud ( .ply file format ) into PostgreSQL Database with PostGIS extension. How can I do that? Any Idea? Any Importer?
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1answer
618 views

3D to 2D from point cloud using a georeferenced orthophoto? [closed]

I have 3D point cloud (laser scanning) and an orthophoto, geo-referenced by a TIFF World File (.tfw). I want to project every 3D point of the point cloud into the 2D image. Here is an example of a ....