Questions tagged [point-cloud]
A point cloud is an unstructured set of points, each defined by x,y,z co-ordinates.
4
votes
0answers
27 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 ...
0
votes
1answer
54 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 ...
2
votes
0answers
34 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
1answer
113 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 ...
1
vote
0answers
27 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 ...
0
votes
1answer
89 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 ...
0
votes
2answers
93 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 ...
1
vote
1answer
24 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 ...
0
votes
0answers
79 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
...
2
votes
1answer
45 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 ...
0
votes
0answers
57 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 ...
0
votes
1answer
43 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....
0
votes
0answers
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?
1
vote
2answers
256 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
55 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
90 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 ...
2
votes
2answers
130 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? ...
0
votes
0answers
69 views
clip large pointcloud many times with lastools
I have a large pointcloud (>310,000,000 points) of an area. For the training of a neural network I need to create 224*224 dems of the entire area. My workflow right now contains the clipping of the ...
0
votes
0answers
50 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 ...
4
votes
1answer
245 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
votes
0answers
247 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
votes
8answers
2k 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 ...
4
votes
2answers
219 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 ...
1
vote
1answer
70 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
vote
0answers
28 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
votes
3answers
342 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 ...
1
vote
1answer
84 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
votes
1answer
98 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 ...
1
vote
0answers
54 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
votes
1answer
250 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 ...
2
votes
1answer
2k 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
vote
0answers
49 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
votes
1answer
174 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-...
2
votes
2answers
288 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
vote
0answers
323 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
votes
1answer
124 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
vote
1answer
372 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
306 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
440 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 ....
0
votes
0answers
256 views
What software can be used to postprocess Velodyne HDL-32E with Applanix APX-15?
I have two sets of data that are synchronized in time domain:
Raw LiDAR data from Velodyne HDL-32E.
INS data from Applanix APX-15.
LiDAR data is in it's proprietary format (*.pcap) which is ...
1
vote
0answers
41 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
votes
1answer
572 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
2answers
92 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
831 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
votes
1answer
285 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
votes
1answer
877 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
votes
1answer
309 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
163 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....
0
votes
0answers
31 views
Reduce point cloud elevation data [duplicate]
Been searching for an answer for this but can't find none.
I have a point cloud data file (las) that shows elevation using height above ellipsoid and is actually 40meters higher than the actual ...
1
vote
0answers
94 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, ...
