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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12
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5answers
2k views

Creating photogrametric point cloud of an object from distributed photographs, here: Making accurate 3D model of building using UAV imagery?

Is there a way of creating a photogrametric point cloud from a set of densly distributed photographs of an object? Application: I am trying to investigate if creating a 3D model (point cloud) of the ...
10
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8answers
4k views

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 ...
8
votes
4answers
3k views

Thinning large LiDAR point cloud?

I have a large point cloud (LAS file) and I am trying to thin this using a complex technique. I know it is possible to thin a point cloud using simple techniques such as extracting every nth point. ...
8
votes
1answer
112 views

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 ...
5
votes
2answers
198 views

Cutting a hole out of a LAS file to omit that area?

I have a LAS dataset of a forest stand and a chunk of it has been recently clearcut. I would like to update the LAS to reflect this so I can model the area but showing the clearcut hole in the canopy....
5
votes
1answer
516 views

Why aren't there LiDAR records in some black and white parts of the scene?

This is the actual scene: This is the corresponding LiDAR scene: The LiDAR data is from xyz file. The questions are: Why are there no points for the dark squares on the checkerboard as well as the ...
5
votes
1answer
360 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 ...
5
votes
1answer
2k views

GeoReference XYZ point cloud

I am looking for help. I have done a little bit of geo-registration of images with QGIS. But now, I have been handed some LIDAR data in PCD format (basically x,y,z), But it is not geo-referenced. I ...
4
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3answers
607 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 ...
4
votes
2answers
334 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 ...
4
votes
2answers
141 views

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?
4
votes
1answer
2k views

Viewing point clouds in bpf format?

Is there any software that can be used to view point clouds in bpf format? My preference is for free software that has low-learning curve for quick visualizations. Currently, I convert bpf to las ...
3
votes
2answers
481 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 ...
3
votes
2answers
948 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 ...
3
votes
1answer
822 views

Drone that generates a point cloud from photography

I read this in a trade magazine today, ​“Esri has just released the Drone2Map for ArcGIS app, which transforms high-resolution drone imagery into ready-to-use aerial data in the GIS platform. ...
3
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2answers
873 views

Generating DEMs from point clouds and differencing them?

I have two point clouds obtained via structure from motion (ground photos of sand-dunes + Visual SfM/Agisoft Photoscan). If I wanted to generate a DEM from these point clouds and difference them to ...
3
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0answers
48 views

Creating measure tool that can be used on 3D model on ArcGIS Online? [closed]

I have a 3D-Point cloud model of a rock formation that I want to upload onto ArcGIS Online. Is there a way to create a tool for the web user to determine distance across the surface of the model, ...
2
votes
1answer
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 ...
2
votes
1answer
874 views

Georeferencing LIDAR scans in CloudCompare?

I've got several LiDAR scans in local coordinates (point cloud with an arbitrary 0,0 as origin) that I would like to reference to real world coordinates. I've tried to Align the scan in CloudCompare ...
2
votes
1answer
223 views

PDAL removes color attribute from LiDAR point cloud?

I am trying pdal to perform a ground filtering on a point cloud (las file) with colors. I use the pcl option and this tutorial Identifying ground returns using ProgressiveMorphologicalFilter ...
2
votes
1answer
2k views

Open-source reader of Leica C10 terrestrial LiDAR proprietary file format

I have a Leica C10 terrestrial LiDAR (laser scanner) system. The system creates and stores point cloud data in a proprietary .bin file. Currently I have to use Leica's proprietary LiDAR software, ...
2
votes
1answer
59 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 ...
2
votes
1answer
55 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 ...
2
votes
1answer
103 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( ...
2
votes
1answer
1k views

How can I create a 16bit PNG heightmap in QGIS?

I am new to QGIS or any GIS software. I have been using a totalstation to measure a hillside and I am trying to convert the point cloud to a 16bit png heightmap that I can use in Unreal Engine 4. I ...
2
votes
1answer
891 views

Measuring volume using DSM instead of point clouds in Pix4D

I've go a point cloud generated in the Pix4D software from about 90 aerial images. I am trying to measure piles of coal and have found that using the volume measuring tool on the point cloud model ...
2
votes
1answer
81 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,...
2
votes
1answer
552 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 ...
2
votes
2answers
236 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? ...
2
votes
1answer
168 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 ...
2
votes
1answer
646 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 ....
2
votes
2answers
113 views

Interpolating specific area on point cloud in QGIS

I am making a heightmap and am trying to interpolate a specific area on a point cloud in QGIS. I have found some ways of using GRASS to interpolate using the attribute table. The problem is that the ...
2
votes
1answer
425 views

Algorithm or command line tool to decimate point cloud of terrain points?

I need to take a larger (more dense) than needed list of lidar survey points (longitude, latitude, and elevation) for terrain definition and decimate it based on a 2 dimensional grid. The idea would ...
2
votes
0answers
66 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 ...
2
votes
0answers
197 views

3d model to point cloud

Excepting FME, is there a way to convert 3d model to point cloud?
1
vote
1answer
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. ...
1
vote
2answers
1k views

PDAL: Couldn't create filter stage of type 'filters.voxelgrid'

I have the following PDAL pipeline: <?xml version="1.0" encoding="UTF-8" standalone="no"?> <Pipeline version="1.0"> <Writer type="writers.pgpointcloud"> <Option name="...
1
vote
2answers
622 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 ...
1
vote
1answer
124 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 ...
1
vote
1answer
168 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 ...
1
vote
2answers
371 views

Can't normalize LiDAR point cloud with lasheight and -replace z (LAStools)

When I try to use lasheight with -replace z to normalize the point cloud, the height of points are changed (destroyed heights; see pictures below). Without using -replace z everything is ok, but the ...
1
vote
1answer
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 ...
1
vote
1answer
121 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 ...
1
vote
1answer
504 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 ...
1
vote
1answer
388 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?
1
vote
1answer
223 views

Resampling point cloud data using ArcGIS Desktop?

I am working on point cloud data, but do not know how to re-sample the point cloud by equally spacing them vertically and horizontally. If possible in this direction can anyone via ArcGIS DEsktop ...
1
vote
1answer
59 views

Can targets placed on the facades of a building be used to increase the accuracy of a point cloud of a building generated from Drone/UAV/UAS imagery?

Can targets (used for registering point clouds) mounted on a building be used to increase the accuracy of a point cloud generated from UAV imagery?
1
vote
1answer
34 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 ...
1
vote
0answers
72 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 ...
1
vote
0answers
56 views

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 ...