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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questions
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Comparing Point Clouds
I have been tasked with creating a system that will get the volume of a stock pile or an area based upon taking two point clouds named PC_A and PC_B. PC_A is the control point cloud of the area and ...
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Separating (“high enough”) trees from “lower height” vegetation? In abstract (non-RGB) .xyz point cloud
Suppose I want to select trees that are "high enough", but the data contains other vegetation, like bushes and smaller trees.
My data is abstract (non-RGB) .xyz point cloud. I.e. there's only ...
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pdal: why does filters.hag and filters.ferry with HeightAboveGround=Z reset original points to Z=0?
pdal: why does filters.hag and filters.ferry with HeightAboveGround=Z reset original points to Z=0?
I'm essentially trying out the example-3, given here:
https://pdal.io/stages/filters.hag.html#...
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15 views
Custom Cesium3DTileset loader
I'm looking into Cesium point cloud visualization and the possibility to provide data using a custom 'loader'/'data source' and not through URIs as specified by the 3D Tiles Format Specification. This ...
2
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1answer
43 views
Applying machine learning methods in orfeo toolbox into DEM raster
I would like to apply machine learning methods in orfeo toolbox to classify some landscape features such as shrub and coarse woody debris in woodland. I created DEM raster image from very dense ground ...
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1answer
76 views
Using function lasdetectshape of lidR
I would like to try "lasdetectshape" in lidR package to detect line pattern objects in my point cloud.
library(lidR)
las <- readLAS("9a-1.las", select = 'xyzicnrRGB')
las <- lasdetectshape(las,...
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1answer
36 views
Separating LAS Dataset (.lasd) into point files of each class?
I am want to examine my DEM, DSM, and other models I'm generating from LiDAR data in the model wizard to find the method with the least amount of error.
I want to separate the ground, and non-ground ...
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1answer
65 views
Point cloud - Why don't all the points show up in AGOL or ArcGIS Pro?
Whenever I upload a LAS file in ArcGIS Pro, not all the points are shown. And there are even less points when I upload it to AGOL.
Is there a maximum of points ArcGIS Pro and AGOL can show ?
If yes,...
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29 views
Showing all points of point cloud layer using ArcGIS Pro
I have a point cloud file of some trees. I first convert this to a LAS using some converter tool. I then open this LAS file in ArcGIS Pro and somehow it doesn't show all points there is. Even if I set ...
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1answer
37 views
Treetop location in 3D: How can I find the coordinates (x,y,z) of point cloud's local maxima within polygon vectors?
I'm doing forestry analysis of some point cloud data and I have used segmentation procedures (i.e. watershed algorithm, etc..) to delineate the crown boundaries of individual trees in 2D.
The vector ...
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136 views
Converting from .las to .ply and vice versa in Python? [closed]
I am trying to convert a .las/.laz file into .ply file, read the .ply file, do some processing on it and then convert it back to .las/.laz file.
Is there any Python implementation for this?
For ...
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1answer
51 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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27 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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113 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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141 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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2answers
226 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?
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1answer
74 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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1answer
88 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....
2
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1answer
74 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 ...
1
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1answer
60 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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1answer
504 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....
2
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1answer
111 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,...
8
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1answer
135 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 ...
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1answer
600 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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0answers
83 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
859 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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0answers
77 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 ...
1
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1answer
355 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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vote
2answers
548 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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vote
1answer
41 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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201 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
73 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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0answers
161 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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1answer
179 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
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0answers
17 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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2answers
855 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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1answer
157 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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vote
1answer
209 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
285 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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0answers
107 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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votes
1answer
500 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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0answers
492 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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8answers
5k 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
397 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
votes
1answer
120 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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0answers
32 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
772 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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1answer
135 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
122 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 ...
