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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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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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 ...
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197 views

3d model to point cloud

Excepting FME, is there a way to convert 3d model to point cloud?
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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 ...
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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 ...
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0answers
85 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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0answers
31 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 ...
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0answers
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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0answers
62 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 ...
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0answers
443 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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102 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, ...
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0answers
292 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 ...
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25 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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98 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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1answer
44 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....
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1answer
401 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 ...
0
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1answer
257 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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0answers
158 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 ...
0
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123 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
45 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 (...