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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Fixing Pixelation in DSM [duplicate]

I ran las dataset, then las to raster using max for DSM. Two and a half hours later I have 3 areas showing pixilation using higher level coloring. See enclosed image. I found on web that seamless ...
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15 views

How to classify a LAS file into ground points and vegetation [duplicate]

I have a dense LiDAR point cloud in .LAS format for a forest. All the points are unclassified. Just wondering how to manually classify the points into ground points and vegetation. I noticed that a ...
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2answers
384 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 ...
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1answer
64 views

Expression into the raster calculator to invert DEM

I've made a DEM from first pass LiDAR data which I want to invert and run watershed segmentation and basin delineation over in order to hopefully extract tree canopy outlines and heights - I'm newish ...
2
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1answer
60 views

Finding the origin in .laz file with LAStools

I obtained a .laz file, which I used lasinfo and las2txt to view the records. Scale Factor X Y Z: 0.00100000000000 0.00100000000000 0.00100000000000 Offset X Y Z: 22717....
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44 views

Leica Cyclone 5.1 TLS Data referencing using Trimble DGPS

I am using a Leica HDS3000 Terrestrial Laser Scanner (TLS) and Cyclone version 5.1 to acquire and process point clouds. Within the manual for Cyclone 5.1, Leica mentions that a user can enter the ...
3
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1answer
72 views

GRASS r.in.lidar problem on Windows 10: 'no such file or directory'

I'm having problems to load .las files into Grass GIS 7.0.3 for Windows 10. I use the module r.in.lidar but I get the following message: What can I do? How can I solve the problem?
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1answer
100 views

How to find the height information from LiDAR point cloud data [duplicate]

I need to find the biophysical parameters(biomass) from the LiDAR point cloud data. For that I need the height of the trees from the data. Currently I am having the general height with respect to sea ...
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2answers
105 views

PDAL: Couldn't create filter stage of type 'filters.voxelgrid'

I have the following PDAL pipeline: <?xml version="1.0" encoding="UTF-8" standalone="no"?> <Pipeline version="1.0"> <Writer type="writers.pgpointcloud"> <Option name="...
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6answers
336 views

Where can I find open raw LiDAR data for European Countries?

I'm looking for LiDAR data in laz or las format preferably from an FTP site. Does anyone know which countries have that data available to the public? From my research it doesn't seem to be easy to ...
5
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1answer
220 views

Merging .asc files = “The command line is too long”

Having problems merging LiDAR .asc folder files to produce a single GeoTiff file. I have followed various instructions e.g. the 2 methods of selecting input files for merging .asc files using ...
2
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0answers
81 views

LAStools in QGIS 2.8.5: “missing dependency. lastools folder is not configured” [duplicate]

I am using QGIS 2.8.5 Wien and I am trying to install LAStools toolbox. I followed the instructions in rapidlasso.com to install it. I did everything said on the link, but when I tried to run it, it ...
2
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1answer
85 views

Creating multiple LAS datasets from LiDAR files in various directories using model builder?

I have 60 folders each containing approximately 20 LiDAR files in .las format. I want to create one LAS dataset from .las files from each folder, and each LAS dataset is named by the folder name. I ...
2
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0answers
63 views

QGIS 2.12 LAStools lasmerge error: “no outputs specified” [closed]

I am trying to merge 4 .las files with "lasmerge" within "LAStools" in QGIS 2.12 running Windows 7 64. I keep on geting error "no outputs specified" even thoug i did specify the output folder and ...
7
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2answers
208 views

Are PDAL or PCL capable of producing LiDAR grid metrics?

I typically use Windows-based FUSION to generate grid metrics, which can be used to describe forest structural characteristics. From the FUSION documentation: GridMetrics computes a series of ...
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0answers
21 views

UK Environment Agency Lidar data [duplicate]

I have recently downloaded LIDAR data from the Environment Agency website in the form of asc file. In order to perform some viewshed analysis do I have to convert these files into a raster file and ...
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1answer
144 views

Open a SBET file format in GIS software

After a LiDAR flight, we can get a file containing the airplane trajectory in SBET format - Smoothed Best Estimate of Trajectory. Is it possible to open it in a GIS software like QGIS or ArcGIS? If ...
3
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1answer
79 views

How exactly does a single laser pulse from LiDAR act? [duplicate]

I'm trying to understand the behavior of a single laser pulse in a traditional airborne lidar. I understand that the multiple return values are representative of the surface that reflected the ...
3
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1answer
111 views

How to exclude water during contour generation?

I recently acquired a LiDAR data set that included a 1 meter DEM. I generated 1, 2 and 5m contour layers but I am seeing a lot of contours within water bodies. I suspect this is either caused by wave ...
7
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3answers
627 views

Thinning large LiDAR point cloud?

I have a large point cloud (LAS file) and I am trying to thin this using a complex technique. I know it is possible to thin a point cloud using simple techniques such as extracting every nth point. ...
1
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1answer
80 views

Average of raster elevation based on polygon boundaries

I am attempting to extract and calculate the average height of buildings using LiDAR converted to raster elevation data. I've created a DSM to cover the entire area and I am trying to extract just the ...
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1answer
103 views

Azimuth greater than 360 in Veloview (Velodyne 32)?

When I use Veloview, freezes at 1 of the frames and examine the data points, why are the azimuths greater than 360 degrees?
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1answer
50 views

Converting waveform LiDAR to discrete return format, in R?

I have an LVIS waveform LiDAR file which looks like this: head(lidar) V1 V2 V3 V4 V5 V6 V7 V8 V9 [1,] 529437.4 ...
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1answer
211 views

Creating building footprints from LAS files

I wish to create building footprints from the classification in our LAS files. I have filtered out the building points, using the point cloud filter. But I now trying to join the outermost points of ...
2
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1answer
232 views

Viewing point clouds in bpf format?

Is there any software that can be used to view point clouds in bpf format? My preference is for free software that has low-learning curve for quick visualizations. Currently, I convert bpf to las ...
2
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1answer
109 views

Creating a Terrain from a Multipoint file if the “New Terrain Wizard” is missing?

I created a multipoint file using the tool LAS to Multipoint in ArcMap. After it was done processing, I went to my geodatabase, right-clicked and attempted to create a terrain. However, the wizard ...
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45 views

LiDAR doesn't work in QGIS [duplicate]

I'm having troubles to make LiDAR work in QGIS, the instructions are quiet clear and it appears in my processing dialog but when I try to run "lasview" it just doesn't do anything, not even an error, ...
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3answers
171 views

Irregular XYZ point data to raster (TIF) - LASTools alternative?

I am trying to convert my irregular spaced point data (xyz) to a DEM and then, to a raster (geotiff). Because of the irregular spacing I need a triangulation first, right (so, no spaces are in the ...
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1answer
57 views

ArcScene can't symbolize LAS points by classification code or number of return

I'm using ArcScene 10.3 and loaded a LAS file into a LAS Dataset. When I look at the LAS files statistics I can see that there are several classification codes and 7 different returns. Everything ...
2
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0answers
48 views

Create a raster dataset containing the number of returns from a las file? [duplicate]

I already created DEMs, DTMs, DSMs from a LiDAR (LAS) file with a little help from the internet. However, right now I'm kind of stuck in my research. I want to create a raster file which contains ...
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3answers
385 views

Open LiDAR DEM of the UK with *.asc extension

I've downloaded a tile of a freely accessible LiDAR DEM of the UK from http://environment.data.gov.uk/ds/survey#/download. But I don't know how to open it. The files inside have the *.asc extension. ...
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1answer
110 views

Reset a base elevation in Pix4D?

Does anyone know how to set a baseline elevation in Pix4D, or is that something that has to happen on the drone-capturing side? The reason is that I have an area which is flown with LiDAR, several ...
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55 views

LasDatasetToRaster does nothing to the Raster Layer

I have been trying to figure out how to clip and rasterize a LiDAR map file programmatically (Not through arcpy) I use C# but read many languages. So far I have been able to access and assign the LASD ...
5
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1answer
332 views

GeoReference XYZ point cloud

I am looking for help. I have done a little bit of geo-registration of images with QGIS. But now, I have been handed some LIDAR data in PCD format (basically x,y,z), But it is not geo-referenced. I ...
1
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1answer
52 views

How to write a python code for Add Feature Class To Terrain using interface?

I am trying to write a code that creates a Terrain from lidar data (LAS). The problem is that the inputs are in Feature Dataset in GDB but I don't know how to write code so that using an interface. I ...
2
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0answers
165 views

Problem reprojecting LiDAR data using liblas

I have multiple lidar data sets and I am trying to reproject them using liblas. They are missing the coordinate system in the header information so I assign them an SRS using las2las --a_srs: las2las ...
1
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1answer
136 views

Using lasmerge in QGIS 2.8.3 is not working: “…instance has no attribute”

Every time I try running lasmerge tool from LASTools within QGIS, I get the following error message: Algorithm lasmerge starting... lasmerge instance has no attribute '...
4
votes
1answer
286 views

Converting LAS 1.4 to 1.2

LIDAR files were released for major part of Slovenia few months back in zlas format. Decompressed LAS format is 1.4 version. I have tried many options how to generate DEMs and had some success in ...
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35 views

Creating a reference line among LiDAR points and retrieving distances between them?

I have a LAS dataset which contains points with x and y coordinates. For further analysis I need a new dimension which can be adjusted as the dataset requires. To make it understandable I made this (...
2
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1answer
75 views

Merging more than 9 input files with lasmerge?

Is there a possibility to feed more than 9 LAS files to lasmerge tool? The user interface only allows 9 LAS files from LAStools toolboxes in QGIS or ArcGIS, but at liblas.org it’s described as there ...
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0answers
72 views

Las tools vs Geocue for LAS1.3 processing [closed]

I am a user of terra solid products. I have las1.3 data set which i need to perform whole processing in 1.3 version. (I need to supply WDP informtaion and classified las dataset as well. So I afraid, ...
1
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1answer
38 views

LAStools blast2dem: error writing data for field “StripOffsets”

I was processing an overage file to generate DTM and DSM using blast2dem. The generated DTM file can be viewed using ArcMap and ENVI. However, ArcMap and ENVI cannot open the generated DSM file. I don'...
3
votes
1answer
140 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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0answers
86 views

TIF not showing UTM coordinates in world file

I have a lot of tif files (ortho imagery that came with Lidar data). Each tile has a .tif and .tfw but the world files (.tfw) have line 5 and 6 as numbers that aren't what I would expect as I was ...
2
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1answer
232 views

Reaching cm (inch) level elevation precision using drones

A road construction firm needs altitude data of road path before and after the construction and the error should be less than 3 cm (2 inch). Normally, they put a ground station and workers manually ...
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0answers
47 views

Reference file paths stored as attributes in Model Builder

I'm trying to design a model in Model Builder that will derive input files for a process from file paths stored in an index shapefile's attribute field. The two datasets involved are a shapefile ...
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0answers
70 views

Caching LiDAR Image Service outside of ArcGIS to send to ArcGIS Server? [closed]

I have very limited programming/coding experience. We are hosting a number of LiDAR services on ArcGIS Server, and need 24 of these to be cached, from 1:500,000 to 1:4,000. We initially had ...
5
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1answer
270 views

Why aren't there LiDAR records in some black and white parts of the scene?

This is the actual scene: This is the corresponding LiDAR scene: The LiDAR data is from xyz file. The questions are: Why are there no points for the dark squares on the checkerboard as well ...
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121 views

Converting raster to TIN in ArcMap 10.1 is causing crashes?

I have several tiles (~200) of Lidar 1m resolution data from Geomatics group and need to convert it to TIN format (currently in .asc) to develop a flood model. Is there a quicker way of doing this ...
10
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3answers
1k views

Benefits of *.las vs *.xyz or *.ascii when working with LiDAR in ArcGIS for Desktop?

From time to time, we use LiDAR data for modelling in ArcGIS. Previously, we would be supplied either an .xyz or .ascii of the data, but more recently, we are also being provided .las files in ...