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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5
votes
1answer
604 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 ...
0
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0answers
546 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?
10
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8answers
6k 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 ...
7
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3answers
546 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 ...
2
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1answer
151 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( ...
1
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0answers
33 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 ...
4
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3answers
931 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 ...
2
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1answer
157 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 ...
0
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1answer
134 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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0answers
60 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 ...
0
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1answer
361 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 ...
3
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1answer
6k 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 ...
1
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0answers
69 views

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 ...
0
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1answer
363 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-...
3
votes
2answers
731 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 ...
1
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0answers
548 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 ...
2
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1answer
221 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 ...
1
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1answer
664 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
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1answer
430 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?
2
votes
1answer
844 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 ....
1
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0answers
48 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 ...
2
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1answer
1k 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
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2answers
137 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 ...
3
votes
1answer
2k 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 ...
0
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1answer
785 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 ...
0
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1answer
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?
2
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1answer
571 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 ...
5
votes
2answers
305 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....
1
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0answers
131 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, ...
3
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0answers
51 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, ...
1
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1answer
261 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 ...
3
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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 ...
3
votes
1answer
848 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. ...
1
vote
2answers
492 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 ...
0
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3answers
345 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?
1
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0answers
122 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 ...
-1
votes
1answer
2k 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 ...
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 ...
1
vote
1answer
61 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
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0answers
355 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 ...
2
votes
1answer
987 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 ...
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="...
8
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4answers
4k 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. ...
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 ...
5
votes
1answer
3k 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 ...
3
votes
2answers
1k 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 ...
1
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0answers
613 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 ...
2
votes
1answer
250 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 ...
5
votes
1answer
599 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 ...
1
vote
0answers
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 ...