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Questions tagged [las]

An industry-standard binary file format that maintains information related to lidar data.

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20 views

Filtering trees with Mac

I own about 200 acres of forest with about 350' of elevation change. I have a DJI 4 Advanced and my goal is to produce elevation maps to plan the building of one or more ponds. I've tried, and ...
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0answers
37 views

Getting source bounds when filtering LAS using PDAL? [on hold]

I'm using PDAL to filter out non ground points to create a DTM along witha DSM also made through PDAL to create a Canopy Height Model using this method. Sometimes when there aren't any points classed ...
2
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2answers
35 views

Convert WKT coordinate reference system to PROJ4

I'm currently working on a better support of LAS 1.4 file format in the rlas R package. In LAS 1.4 format the CRS of the point cloud can be stored as a WKT string. For example this is what I read from ...
1
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1answer
81 views

Splitting LAS file into smaller LAS files by shapefile geometry boundaries - using PDAL or Global Mapper. [duplicate]

I've looked up pdal documentation on how to clip LAS point cloud files:- https://pdal.io/workshop/exercises/analysis/clipping/clipping.html Referencing this example, and having a quick look around, ...
3
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1answer
68 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....
2
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1answer
66 views

LAS/LAZ parser for NodeJS

I cannot find any popular libraries for parsing (reading into memory) of LAS or LAZ (lidar data) files in NodeJS (desktop Javascript) https://github.com/yuyou/liblas4node/blob/master/lib/liblas.js ...
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3answers
65 views

Maximum number of returns per laser pulse in airborne LiDAR?

What is the maximum amount of returns a discrete aerial laser scanner is capable of recording? For example in a LAS 1.2 metadata under Point Data Records there is the category 'Number of Returns' ...
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1answer
37 views

PDAL info with docker yields no output?

I am using pdal info within a docker env for a specific .las file (~2 GB). docker run -v /Users/user.name/workspaces/testData:/data pdal/pdal pdal info /data/sp.las --developer-debug Unfortunately, ...
2
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1answer
34 views

Whitebox Tools ClipLidarToPolygon writes no points to output file?

Running Whitebox Tools (v 0.11) on Windows from the official binary. The ClipLidarToPolygon tool creates an output LAS file with no points and the message There are fewer than two points in the LAS ...
1
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1answer
164 views

Merging multiple LiDAR (.las) files?

I downloaded about 9 LiDAR scenes from USGS and I want to use ArcGIS to merge them so that I can carry out tasks on them together as opposed to one by one.
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2answers
98 views

Adding RGB values to Laspy synthetic point generation?

What is the correct way to add RGB values to points made from scratch? Laspy is working great for me so far. I want to add RGB values to synthetic points that I've generated. I am using 2 numpy ...
2
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1answer
133 views

Importing LiDAR point cloud classes in Potree?

I can't find a way to import classes (roof, vegetation, ground, etc..) in Potree. I generated the web page, except I get the black point cloud. When I, for example, open .las file in ERDAS Imagine, I ...
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0answers
99 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 ...
1
vote
1answer
101 views

Converting .pcd LiDAR binary compressed file to .las format?

I have LiDAR data in the format of .pcd in a binary compressed file (version .7). How can I convert it into .las format or any other that can be readable by LAStools in ArcGIS 9.3 version ownwards? ...
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0answers
76 views

Load a .las file in QGIS 2.18.7 [duplicate]

Looking to load a .las file into QGIS so I can view it's coverage and extents. What is the best method to get this work quickly and efficiently?
1
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1answer
115 views

JSON pipeline in Python doesn't create any output file?

I have ground LiDAR point cloud with some noise points. I would like to use filter.statistics in PDAL (in Python 3.6) using JSON pipeline to filter the noise out. json = """ { "pipeline":[ "/9A-...
1
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1answer
103 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 ...
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0answers
40 views

Selecting .las points based on intersection with polygon in ArcGis

I'm trying to select all .las points that fall within a selected polygon. So basically like select by location, but with a .las file and a feature layer file instead of two feature layer files. I ...
1
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1answer
86 views

Batch processing LiDAR files (.las to raster) with PyQGIS?

for layers in glob.glob("*.las"): processing.runalg("grass7:r.in.lidar", "input_las",5,1,"",1,100,"","",5,"","",False,True,True,"331289.57265,337990.42735,4558790.0,4560890.0",0,layers+"E:/...
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0answers
33 views

PyQGIS code for r.in.lidar in pyQGIS for LiDAR DEM output? [duplicate]

processing.runalg("grass7:r.in.lidar", "PNOA_2016_CAT_huso31_346-4560.las",5,1,"",1,100,"","","1","","",False,True,True,"295165.831809,383949.483035,4552152.32354,4577352.32354",0,"E:/Rohan/Heimdall/...
0
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1answer
85 views

Batch scripting r.in.lidar in pyQGIS for LiDAR DEM output? [duplicate]

I need to use pyQGIS to write a script that will run the r.in.lidar GRASS 7 on a set of LAS files. I am terrible at Python, but I need this for my task. I would like to process as a batch. How can I ...
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0answers
89 views

Create laspy file object without creating a new file

I would like to create a new laspy.file.File object in memory without having to create a reference .las file. The basic procedure is read sample.las clip sample.las by converting the x and y ...
1
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0answers
113 views

Visualizing LAS with matplotlib

I'm trying to create a 3D scatterplot using an las file that contains xyz and return values. I want to keep all returns but would like to subset the cloud. I've learned how to subset using laspy so no ...
5
votes
1answer
245 views

GRASS's r.in.lidar error in QGIS 3: “North must be north of South”

I have LAZ files that I unpacked with laszip.exe, then I ended up with LAS files. These files showed no error when making a LAS dataset in ArcGIS. I used this dataset several times without ant issues....
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2answers
438 views

laspy ValueError: buffer size must be a multiple of element size

I am trying to learn LASPY and am running into road blocks off the bat. I first ran into and Error 8 (Not enough storage is available to process this command) using my full sized LAS file (1.7GB). I ...
1
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1answer
92 views

Classify LAS By Height tool is not yielding any results?

The classify LAS by height tool (CLHT) in ArcGIS says that it will only reclassify LAS points with class codes of 0 or 1 (http://pro.arcgis.com/en/pro-app/tool-reference/3d-analyst/classify-las-by-...
6
votes
1answer
246 views

Laspy exception: “Invalid format”

I am attempting to open a couple of las files in laspy, however one of them has file version 6.0 (although it does not show up as such in lasinfo - I may be missing something). Digging through the ...
1
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0answers
291 views

Generate Height map for unity-3D from Lidar point data [closed]

I have Downloaded a data set from udacity open source self driving car program from here. It is a ROS (Robotic operating system) BAG file more info.The BAG file contains data collected from Velodyne ...
5
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2answers
1k views

Converting TIFF file to LAS file in QGIS?

I've been asked by a client to compile LiDAR files (currently in GeoTiff format) into a LAS dataset. Is this possible within QGIS? I have downloaded LAStools, but I'm still fairly new to LiDAR so ...
2
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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 ...
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0answers
390 views

r.in.lidar Error: 'Raster map not found' in QGIS 2.18.14 GRASS [closed]

First of all I would like to say, that I have checked all the open threads (with almost the same title) about r.in.lidar errors and in general GRASS and it's "raster map not found" errors within QGIS ...
1
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1answer
133 views

GrassGIS process for DTM of UAV point cloud [duplicate]

Using grassGIS I am attempting to produce a DTM (remove buildings and vegetation) from the las point cloud. Unfortunately the point cloud exported from dronedeploy.com does not distinguish first and ...
2
votes
1answer
642 views

Importing LiDAR (.las) data in PostgreSQL with PDAL?

I am following this tutorial to load LiDAR data into PostGIS/PostgreSQL database. The order is: Create extensions: CREATE EXTENSION postgis; CREATE EXTENSION pointcloud; CREATE EXTENSION ...
2
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1answer
248 views

Reading LiDAR attributes from a .mat file?

I am working on some LiDAR dataset. I am used to importing the LiDAR data from .las files. I generally use liblas library in Python to import the same. Recently, I found the dataset in .mat format ...
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0answers
225 views

Loading a LiDAR (.las) file into OpenGL using Python?

I would like to load a .las file into an OpenGL 3D scene. I have been able to create the scene and load other forms of object into it by using their vertices data. How do I get the vertices data from ...
2
votes
1answer
106 views

Importing point cloud data to Terrascan is incorrectly gridding it?

I am using Terrascan to strip vegetation of some ASCII files to create a bare earth model and also to convert the ASCII txt file into a *las (1.2) file. However, I have noticed that Terrascan (at ...
3
votes
1answer
154 views

Unexpected argument grid_dist_x using PDAL

I'm trying to convert a .las file to a DTM/DEM using PDAL, but having the issue of multiple bands instead of one. I went through Generating a DTM and writers.gdal but it prompts an error message: ...
2
votes
1answer
454 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 ....
4
votes
1answer
80 views

Erratic results from filters.normal in PDAL?

Given this roof structure: I get the following output for the normalx, after using: { "type":"filters.normal", "knn":8 }, (orange to purple : -1 to 1) Comparable situation for ...
2
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2answers
2k views

Converting .las to .pcd file using PDAL?

Is it possible to translate .las files to .pcd with PDAL? If so, using which tool? I need an example about how to set the command-line with such tool. If it is not possible (or alternatively), is ...
0
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1answer
202 views

PDAL Reader.las and Writer.las warning: 'found invalid value of '0' for point's return number'

I am trying to read and write LAS (*.las) file using PDAL but getting the following warning messages by PDAL's LAS reader and writer for ASPRS LAS files. (pdal pipeline readers.las Warning) C:/...
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1answer
396 views

Seeking open source alternative of Las Tools [duplicate]

I am finding any open source alternative of Las tools , i Google but i found las Utitly which is also not the Open source alternative But i want open source alternative of Las Tools,
2
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1answer
111 views

Converting .las files to LAS datasets using ModelBuilder iterator?

I have 1500 individual LAS files and I need to move them to separate LAS datasets (so 1500 LAS datasets). I've used iterator (iterate files) in ModelBuilder and it creates 1500 individual LAS ...
4
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1answer
450 views

Converting LAS data from buildings to detailed shapes using ArcGIS Pro?

What we want to achieve is to convert LAS data to a GIS format like shapes. On the internet, there are enough examples how to convert the LAS data height to a building footprint. What we want is ...
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0answers
42 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
591 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 ...
1
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1answer
52 views

Understanding CRS conversion made in LiDAR files?

I have metadata from a Lidar Point Cloud dataset and I'm having trouble understand what exactly was done to it. It reads: The data (LAS files) were received in UTM Zone 18N NAD83 coordinates (...
5
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2answers
167 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....
6
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2answers
721 views

Extracting RGB values from aerial photo and assigning to LAS file with FME?

I need to extract the RGB Values from imagery and assign to a .las file in order to display 3d landscape with "real" colours. I have an unlicenced LAStools, FME 2017 and ArcGIS 10.3.1 at hand. I ...
4
votes
1answer
655 views

Choosing cell size in LAS Dataset to Raster Tool [duplicate]

I am creating a raster from an LAS Dataset (LAS Dataset represents only the ground return). I am wondering how do you choose the sampling size? (which I have set to cell size) My point spacing is ...