Questions tagged [lidar]

LIDAR (Light Detection and Ranging or Laser Imaging, Detection and Ranging) is an active optical remote sensing technology that measures properties of scattered light to find range and/or other information of a distant target.

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1answer
49 views

Why is normalize_height() function aborting in lidR?

I'm trying to run normalize_height() on 328 las files. Maybe or maybe not relevant: I'm not running using LAScatalog because I couldn't get that to run at all. Anyhow, I'm running using a parallelized ...
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0answers
24 views

LiDAR data for 3D use

What data type do I need to create a LiDAR 3D surface model? I have downloaded LiDAR/DSM data from Environment Agency, both as a WMS and as individual ASCII files, and it looks good but I want to view ...
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0answers
10 views

FOR loop for ground filter Fusion batch file [closed]

Good day all, I tried creating a batch file for the ground filter function of Fusion to create a ground .laz file for each of the input files one by one. For this purpose, I am using the FOR loop to ...
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0answers
11 views

FUSION Microsoft visual runtime library C++ blank error

I am trying to run the DTM script on 73 laz files (each file >500 MB) and a big single ground filter.laz file > 1 GB that has 303239327 points. The laz files ran just fine with the ground filter ...
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2answers
70 views

Individual tree segmentation workflow with lidR package

I am seeking advice on how to build a workflow for individual tree segmentation (ITS) processing with the lidR package using catalog objects. My current ITS workflow is parallel and leverages the ...
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2answers
4k views

Interpreting .ASC/LiDAR Data?

I'm a complete novice to the world of GIS. I'm involved with a project which requires LIDAR data to be imported into CAD software. When I go to the geostore, which contains LIDAR survey data ...
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0answers
26 views

Calculate average elevation value in LAS files in a specific area

I need to calculate the average elevation and its standard deviation of some buildings and parts of roads using LAS files. I want to be able to consider only the points that are within a polygon in a ...
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0answers
40 views

Comparing two point clouds, one in WGS84 and the other in ECEF

I'm really a newbie and this task seems over my head. Suppose you have one cloud from LiDAR (a LAS file) with coordinates in WGS84 and another cloud, obtained from structure-from-motion, in ECEF. They ...
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1answer
25 views

Export more than one object with catalog_apply

I am looking for advice on how to export more than one type of object when using catalog_apply() from the lidR package. For example, in the code below the custom function fn_bufferTile() computes a ...
1
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1answer
54 views

Understanding DEM of difference results in ArcGIS Pro [closed]

I am looking at channel change in a river in the UK and am using three DTM rasters to observe change over time. One of the methods I am using is to simply minus one DTM from another. I have got the ...
3
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1answer
515 views

Error in reading point cloud data (.las) in R?

I want to generate a DEM using a point cloud (.las) for which I tried reading it in R using rlas, lidR and rLiDAR : readLAS command and none of it seems to work. The LASfile is not being read at all....
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19 views

R giving LAS file read error

I am using the rLiDAR package to read some LAS files, but the readLAS function in rLiDAR is giving the following error: Error in readLAS("D:/LAS_Files/test_1.las", short = TRUE) : no ...
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1answer
105 views

Assign elevation data to GPX from LIDAR data

I am totally new to this, so sorry for the basic question. I have some GPX files which have elevation data, but I am aiming for greater accuracy. Currently I have used OS benchmarks to correct the ...
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0answers
10 views

GroundFilter.bat creating a .lda file and a 1 KB laz file

I ran the GroudFilter.bat FUSION script to create a ground filter file, but the script is creating a .lda file with a 1 KB laz file. How can I make the GroundFilter.bat script to create a laz file. By ...
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0answers
23 views

LiDAR data denoising algorithm complexity

I want to remove outliers (noise) from LiDAR data. Currently I'm using the same algorithm as LAStools: The LAStools software version 171215 implements a straightforward outlier removal ...
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2answers
832 views

Convert hdf5 LiDAR data (from GEDI) to LAS or LAZ

I downloaded GEDI LiDAR data in hdf5 format. How can I open this file or convert it to the standard LAS format (point cloud)? When I tried opening the hdf file with QGIS and I got the following ...
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0answers
21 views

las2dem, command not found in terminal

I am trying to use the command las2dem in terminal (Ubuntu) to create a DEM with various las files but I only want to conserve the points classified as Ground. I'm using this command: las2dem -i file....
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0answers
17 views

Removal of drainage channels (defined by steep slopes) from LiDAR DEMs

I have LiDAR DEM tiles (geoTIFF) that feature modern (19th century?) drainage channels but also remains of the pre-modern landscape. To perform further analysis of the latter, I want to remove the ...
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0answers
541 views

How to increase FUSION-LTK lidar processing productivity?

I am processing Lidar data with FUSION-LTK. My study area contains 5 blocks of 1000 las tiles per block. Each block is broken into approximately 4 subblocks of 250 las tiles. I am calculating grid ...
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0answers
30 views

TreeSeg Documentation [closed]

EDIT: Found it --> https://treeseg.readthedocs.io/en/latest/ I have downloaded the TreeSeg repo found here --> https://github.com/apburt/treeseg developed by Andrew Burt. The issue I am running into ...
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2answers
1k views

Deleting anomalous points in *.lasd using ArcGIS for Desktop?

I am using ArcGIS 10.3.1 for Desktop. I have a raw .las file that I have brought into an ArcGIS .lasd file format. The raw data has several anomalous points; i.e. the maximum elevation for any point ...
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2answers
32 views

PDAL is mixing Lat and Lon when using tindex

I am trying to extract polygon representing the extent of my .LAS file. I am using tindex to do so. When importing the resulting file, it looks like longitude coordinates are set as latitude and vice ...
4
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1answer
72 views

Lasclip produces overlap with non-overlapping shapefiles

Using a set of non-overlapping polygons (sf object) to clip a LAScatalog or LAS object creates an overlapping set of LAS files. I think the overlap is due to the use of the bounding box of the shapes ...
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1answer
42 views

How do I get R to recognize a buffer around a las file?

I'm trying to clip from a catalog using a shapefile. The file is huge, so I've divided it into two (ctgw1 and ctgw2). The final radius should be 47 (the ctg is in feet) and I'm trying to set a buffer ...
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0answers
40 views

Elevation obtained from USGS DEM is different from Lidar elevation

For a project I'm working on I need to calculate height of objects for which I know their spatial 2D coordinates (e.g. buildings). I'm using Lidar data to extract the highest Z value for an object, ...
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0answers
17 views

Sensor frame to global frame transformation matrix

I am using Carla simulator in which all data is represented using various coordiantes. But for convenience i turn all data into standard cartesian frame(the simulated world is only a few sq.kilometers)...
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0answers
25 views

How does the runtime of Haralick texture generation scale with the number of bins/gray levels? (Orfeo)

I'm trying to generate some Haralick textures of various LiDAR-derived elevation models (digital height models and digital surface models). Because the height models (DHMs) have a lower bound of 0 and ...
3
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1answer
70 views

Rescaling and reoffsetting a point cloud with lidR?

I'm trying to analyse a a 3 x 3 metres scan derived from terrestrial photogrammetry (i.e. local coordinates, with 0,0 in the centre of the point cloud) to obtain a DSM. Importing the file in lidR, I ...
7
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1answer
430 views

Rescaling LAS file with lidR package in R? [duplicate]

I am trying to process a large .las file received, which appears to have been scaled in non-standard ways for some reason (likely data transfer portability). The scales between x, y, z are different ...
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1answer
72 views

LAS file bounding box is oversized after using lasnoise?

I have a few .las files that I am trying to use further. They have some far away noise points that I removed using LAStools lasnoise. It seems like the noise points are removed, but the bounding box ...
3
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2answers
3k views

Coordinate transformation in LAStools?

LAStools program only limited to UTM platform for coordinate transformation (las2project, las2transform). Is there any other ways to transform coordinate for local projection in LAStools? For example ...
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0answers
35 views

Correcting offset between LiDAR datasets

I am analyzing multiple LiDAR datasets looking at the changes between pre-wildfire and post-wildfire topography. The datatsets are of the same general location. I did not acquire the datasets on my ...
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15answers
28k views

Seeking point cloud (LiDAR) data? [closed]

Is there any freely available pointcloud data? I'm especially interested in dense clouds of small areas(5m to 100m radius) but anything else would be fine too. I've found that these pages have ...
4
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1answer
73 views

Partially processing a catalog with an extent in lidR

I am using lidR to create a DEM of a very large area (over 1 million hectares). I have already processed a portion of this area. I would like to be able to read the entire LAScatalog so that the ...
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0answers
12 views

Convert point cloud dataset with RGB encoding to FBX format

Hope you all are doing good. I have a point cloud dataset with RGB encoding. I need to convert it to FBX format. Is there any way to convert it? Is there any option available? Looking forward to ...
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0answers
23 views

Extended Public Header Block + Point Data Records in LAS 1.4 Point Format Number 6 File

I've received a couple of LAS 1.4 PDF# 6 files with extended Public Header Block Records + Point Data Records. I noticed in the example “upgraded” LAS 1.4 file in the URL below, there were extended ...
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1answer
48 views

arcgis.learn show_batch() index error and lr_find() runtime error while using pointcnn for LiDAR segmentation

I am trying to segment vegetation from LiDAR point cloud using PointCNN on Jupyter notebook. But I am getting Index Error on running show_batch() and runtime error on running lr_find() while using ...
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0answers
17 views

What unit of measurement is rxwaveform from the GEDI L1B dataset in?

Rxwaveform is listed in GEDI's data level product L1B's data dictionary as "The corrected receive (RX) waveforms. Use rx_sample_count and rx_sample_start_index to identify the location of each ...
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0answers
6 views

Satisfactory accuracy for a GEDI geo-locator

What level of accuracy should one expect from a GEDI geo-locator? I'm making a geo-locator for GEDI (similar to https://lpdaac.usgs.gov/news/release-gedi-finder-web-service/ ) and I'm wondering what ...
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0answers
32 views

Reproject LiDAR from Lat/Long to NAD83 with LAStools not working correctly

I'm trying to reproject a NOAA las file from Lat/Long to State Plane NAD83 using las2las. When I unpack the laz file as an las without specifying input or output coordinates it comes into GIS in the ...
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1answer
36 views

Error in for loop not recognizing writeLAS command

I am currently trying to run a for loop in R that creates las files from a vector of 530 objects (EABplots). I have downloaded lidR, rLiDAR, and the relevant packages that come along with them (sp, ...
3
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1answer
50 views

Directional pattern in normalized LiDAR point cloud

I have used the lidR package (https://github.com/Jean-Romain/lidR) to produce a normalized point cloud. I then filter out the points tagged with the overlap bit using: opt_filter(ctg) <- "-...
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1answer
74 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 ...
2
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1answer
89 views

LAScatalog and shapefile fail to line up in lidR

I am currently trying to read in a catalog of las files (statewide 10TB) and extract around 500 plots from a shapefile of central points. The shapefile reads in correctly, and I have checked it in ...
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0answers
57 views

Converting LiDAR log which already in CSV format into PCD format

I have Ouster LiDAR log (LiDAR UDP log file converted into PCAP file and than converted into CSV file). So I want to convert that CSV file data into .pcd file (Point Cloud data format ). CSV file ...
7
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5answers
883 views

Extract DEM and DTM information from LIDAR image using E-Cognition

I´m trying to extract DEM and DTM from a LIDAR file. Currently, I rasterize the image but don´t know which algorithm I need to apply to obtain the DEM and DTM information in different models to be ...
5
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5answers
12k views

Creating DEM from LAS file without using LAStools?

I want to create a ground model from a *.las file. The LAStools are available in QGIS but limited in use (generation of black diagonal in result file), so I can't use this. In the GRASS tools I can ...
3
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1answer
90 views

Fitting circles to crescent shaped clusters in raster data automatically

I have mobile lidar scanner (MLS) that was collected in a forest with big, mature trees. My research involves fitting circles to tree stems to estimate their diameters at different heights. Once I ...
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0answers
54 views

How to improve LiDAR classification in GlobalMapper

I have a LiDAR point cloud that has a density of 16.4 points per m^2 and spacing of 0.2469m, and am trying to extract trees from it but the classification came with a lot of messy points in classes ...
2
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1answer
35 views

Intensity Range Correction - How to choose a power value?

I'm using lasrangecorrection from the lidR package to correct my Intensity values for effects of distance from sensor to target. I'm wondering how to best choose the f parameter (exponent for ratio of ...

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