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
257 views

Generating seamless contours across tiles from TIN/LiDAR data?

I have both TINs and LiDAR data for an entire county, divided into a grid of multiple tiles. I want to generate contours from this data at 2 foot intervals, using ArcGIS 10.5. I decided to do this ...
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2answers
169 views

Open Source GIS tools for using LiDAR to estimate storage behind dams/culvert [closed]

Can you recommend an open source GIS tools for modeling the water impounded on the upstream side of a dam using LiDAR data?
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1answer
58 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 (...
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1answer
111 views

Enabling Surface Constraints on a LASD in ModelBuilder?

I'm working on a LAS processing model. I have been able to: create a LASD from a folder of LAS files. create a mask from the LASD. apply the mask (called Surface Constraints) to the LASD file. ...
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2answers
43 views

Losing DEM (from LAS Dataset) data coverage when calculated in higher resolution?

I am trying to calculate DEMs for different resolutions (15 x 15, 7.5 x 7.5 and 3.75 x 3.75 m) using LAS Dataset To Raster tool in ArcGIS 10.5. Unfortunately, no matter which settings I use for ...
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1answer
643 views

LAS dataset to raster: 'no spatial reference exists'?

I am trying to make a DEM from my LAS dataset and I am using LAS Dataset to Raster tool in Conversion Tools. But I am getting the following error: No Spatial Reference exists. The table was ...
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0answers
77 views

Calculate the volume of a surface above an irregular surface [closed]

I am working with repeat LiDAR data over a dune field. From the LiDAR I have generated a DEM with approximately 30cm accuracy over the entire dune field and generated a TIN from this as well. I need ...
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0answers
423 views

Color ramp that adjusts to changing scale in QGIS? [closed]

Is there a way in QGIS to have a color ramp for a raster layer (DEM layer), which adjusts to a changing scale while zooming in, and out, of the map extent? Here is an online map made based on LIDAR, ...
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1answer
1k views

Seeking open source point cloud software? [closed]

Just acquired a Geoslam Zeb-Revo for scanning our stockpiles and wondered if there was another option to process point cloud data?
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1answer
189 views

Extract LAS tool is not working inside a loop?

In order to extract points from a .lasd (here, I call it "x.lasd") by 30 individual polygons, I am using the following code for the Extract LAS tool in ArcGIS 10.4: inCuadriculas = r'C:\Users\...\...
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0answers
79 views

How to extract and export “raised field” LIDAR objects?

I'm working on Windows 10. In input, I have a .LAS "GROUND_only" LIDAR point cloud (4 millions points). We're interested in geomorphological microstructures called raised field (ground elevation due ...
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2answers
191 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....
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0answers
135 views

Converting vertical coordinate system of LAS dataset? [duplicate]

I want to overlap both LiDAR data and SRTM data but they use different vertical coordinate systems. I am using ArcMap 10.2 and I firstly created a LAS dataset and original vertical coordinate system ...
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3answers
939 views

Creating a Canopy Height Model (CHM) image from a LAS file on Mac?

Main question: Is there a way of creating a Canopy Height Model from a LAS file using Mac (not wine etc)? I also would like to batch process a lot of LAS files the same way. I should mention that I ...
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1answer
1k views

Displaying LiDAR data with RGB values in ArcGIS Desktop?

I have been able to display LiDAR data with RGB values out of aerial photos with SAFE FME and also POTREE. Is there any way to do this with ArcGIS 10.3?
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1answer
701 views

Can't open LASzip GUI on Windows 10?

I am new to liDAR and trying to extract some .laz files to .las. It seems that this should be a pretty straightforward process in Windows using the LASzip GUI, however I am not able to open the ...
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0answers
162 views

Converting Lambert Conformal Conic projected .las file to WGS84? [closed]

I am trying to import .las files in PostgreSQL database. The .las files are from https://viewer.nationalmap.gov/basic/?basemap=b1&category=ned,nedsrc&title=3DEP%20View. The issue is the file ...
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2answers
303 views

Identifying SBET coordinate system and reprojecting it with PDAL?

I've received discrete return LiDAR data from a data provider, which was acquired with an Optech C-300 scanner. In addition to the LAS data, the delivery includes the trajectory information in the ...
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1answer
1k views

Inserting LiDAR points (from laspy) in GeoDataFrame without using a numpy array?

Working with Python 3.6 (Anaconda) under Windows using a laspy fork that works with Python 3 (https://github.com/sethrh/laspy). I am loading a LAS file to a GeoPandas GeoDataFrame to eventually ...
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0answers
251 views

Dynamically styling LiDAR data in QGIS?

I am using QGIS 2.18.4 on Windows. I have LiDAR data in GeoTiff format. Is there a way to dynamically style the GeoTiff layer based on the current map extent? I need to re-style the GeoTiff layer ...
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0answers
57 views

Debugging arcpy LasDatasetToRaster_conversion error 999999? [closed]

I have 40+ LAS Datasets (.lasd) that I am attempting to convert to rasters. Here is my code: import arcpy import os arcpy.env.workspace =r'F:\Shorelas' arcpy.env.overwriteOutput = True env = r'F:\...
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1answer
452 views

How to manipulate elevation colour ramp in Potree?

I would like to render bare earth LiDAR data with a colour ramp using natural colors instead of vibrant blues to yellow to red. Does anyone know how to manipulate Potree to enable this?
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2answers
962 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 ...
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1answer
812 views

Is there any documentation on how to change the user interface of Potree?

Has anyone found or created any information regarding the different user interfaces of Potree? I have created LiDAR portals using the LAStools laspublish tool to create Potree sites, but cannot see ...
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1answer
108 views

Visualising LiDAR data in 3D as ArcGIS Service in browser with ArcGIS Server?

I have lidar data which I would like to present over the intranet in 3D. I have arcgis server 10.3.1 with the image extention. I am however not sure if such a service is available. Is this possible? ...
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0answers
146 views

Why does Lidar to Raster tool in ArcGIS create shifted raster cells? [closed]

I am testing the results of Lidar to Raster with 0.5m resolution with ArcGIS 10.3.1 SAGA-GIS and Grass 7. My LAS File consists of regular spaced points with a 0,5m resolution. No coordinate ...
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0answers
91 views

Unexpected slope returns from terrain analysis [closed]

I'm writing with a question regarding unexpected returns on a slope analysis using DTM LiDAR data at the scale of 2m in QGIS. This is for my MSc dissertation (UK) which is due in about 6 months, so ...
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1answer
856 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 ...
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3answers
1k views

Can ArcGIS Desktop create LAS (or lasd) files from ASCII data?

I have many ASCII files containing LiDAR xyz values. In order to create an ArcGIS LASD file, I need to convert these ASCII files into las files. I can do this with FME or LAStools, but I can't see a ...
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1answer
367 views

Raster DEM interpolation within overlapping vector polygon of water surfaces?

I am analyzing orthoimage and LiDAR dataset to find out flood areas. I extracted water areas as vector polygon from orthoimage using multiresolution segmentation in eCognition, and generated DTM (1.5 ...
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1answer
131 views

Installing MCC-LIDAR on Mac

I'm trying to install mcc-lidar on Mac but get into problems when compiling. [ 3%] Building CXX object CMakeFiles/mcc-lidar.dir/LasDataFormat.cpp.o /Users/Oskar/Documents/mcclidar-code/src/...
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1answer
314 views

Seeking browser viewer for las data? [duplicate]

I am currently preparing lots of las files for analysis and am wondering about the easiest way to share the results on my intranet. Are there any cool web application for displaying and navigating ...
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1answer
745 views

Explaining laser scanning distortions on water surfaces?

I have received tif Laserscan images interpolated from Ascii data. I did not process the data so cannot say which processes or tools were used to interpolate the data. There are strange distortions on ...
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0answers
112 views

Smoothing buildings created from LiDAR to Raster/TIN using ArcGIS Pro? [duplicate]

I have just started working with LiDAR data. My end result would be a DSM. To start with creating this I used the tools LAS to Raster and LAS to TIN. With both the results I'm getting an outcome ...
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0answers
76 views

Running Python script in GRASS every time map extent is altered

I am looking to develop a python script that triggers every time the user zooms or pans to a new map extent. The script I have in mind will clip a raster to the visible extent thus reclassifying the ...
5
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1answer
198 views

Merging massive LiDAR dataset?

I want to store a large LIDAR dataset as a VRT so I can quickly query for elevation values in the entire state of Massachussets. However, I am having trouble actually creating the mosaic. The naive ...
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2answers
355 views

Where does “Add XY Coordinates” tool get data from?

I am using the ArcGIS Add XY Coordinates tool to populate XYZ values in a shapefile after converting .las data to .shp using LAS to Multipoint tool. Does the Add XY Coordinates tool get the location ...
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2answers
362 views

Are LiDAR datasets with same vertical datum, but based on different geoids comparable?

I have two sets of LiDAR for the same region that I would like to compare. Both are in NAVD88. The older LiDAR set used GEOID03 for the transformation. The newer LiDAR set used GEOID09 for the ...
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1answer
440 views

Using ModelBuilder to iterate through LAS files using custom LASToolbox?

I'm trying to use ModelBuilder to iterate through a folder containing 25 usgs .las files and run 4 custom geoprocessing tools from the LAStools toolbox available on github. I am able to successfully ...
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1answer
813 views

LiDAR dataset which is benchmarking for testing classification algorithms?

Is there a publicly available benchmarking database of classified (labeled) LiDAR data? For example, where each point is classified as ground, vegetation, building, road, water, etc? The point clouds ...
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0answers
95 views

Setting NULL values to 0 for tables after geoprocessing in ArcMap? [closed]

I am trying to calculate LAS dataset statistics using the 'LAS dataset statistics' geoprocessing tool in ArcMap 10.3.1. I am working with LAS points and a shapefile of the plots and I need to extract ...
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1answer
256 views

Memory allocation error encountered when automating gridmetrics in R

I am trying to run Fusion's GridMetrics from R, I wrote this for one las file: #First set up directories to keep the raw data #separate from that produced by the analysis, Input (.las) and (.dtm), #...
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1answer
139 views

Which .las classification codes and returns to use when creating DTM and DSM? [duplicate]

I am trying to figure out what classification codes and returns that I should use to create DTM and DSM? In my layer --> "BrooksCamp.lasd" I have these classification codes and returns: (and then 26 ...
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0answers
129 views

Generate LiDAR point cloud understory division through histogram and height threshold [closed]

This is somehow a good post that gives me a bit of direction; Retrieving LiDAR metrics from relative vertical layers of point cloud I'm using FUSION and rLIDAR most of the time. I'm looking for a way ...
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2answers
1k views

Converting LiDAR data (.laz) to DSM in .asc format

I'm looking to convert a LIDAR scan in .laz format into a DSM in ASCII Grid format, in order to calculate RF propagation in an urban environment from a given transmission location (bonus: converting ...
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0answers
158 views

Building vectors in polylines

I have classified the cloud points of LiDAR data into different classes. After extracting I have generated 3d building polygons using "Vectorize buildings" option from terrascan tools. Now I need to ...
3
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2answers
922 views

Manually editing a LiDAR cloud to remove non ground points

I've recently been tasked with cleaning up a LiDAR file of a river where I need to remove trees, shrubs and power lines that run right across the river. I was looking into LAStools but it has a limit ...
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1answer
146 views

Converting DEM to use with Locate Outliers tool in ArcGIS?

I have a DEM and I want to analyse it using the Locate Outliers tool in ArcMap; however the tool only supports Terrain or LAS input files. How to convert the raster DEM to a format that Locate ...
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1answer
352 views

Interpolating LiDAR: same steps but different results?

I'm new to eCognition, and today I tried to use LiDAR data in the program. First, I converted LiDAR to new image layers: 1) Elevation (first return) and 2) Number of Returns (all returns). I got ...
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1answer
109 views

Unusual range of values in LiDAR DEM

I downloaded the data in LAS file format and converted the LAS file to "multipoint" and then used "point to raster" tool to make it as raster, for missing data I used the raster calculator. I got the ...