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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2answers
207 views

Converting LAS to DWG/DXF using open-source software?

Is there a way to convert LAS point clouds to DWG and/or DXF files using open source software? Also willing to script with Python - is this possible using libLAS/LASlib for example?
2
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1answer
85 views

Extract manhole covers from ground LiDAR

I am wondering if anyone has come up with an automated or semi-automated workflow for extracting manhole covers from LiDAR data in ArcGIS? I was thinking about looking at the change in elevation ...
2
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1answer
89 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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1answer
239 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 ...
2
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1answer
147 views

How to output points using TerraScan based on selected shape and text of block boundary

For those of you who are familiar with TerraScan, does anyone know how to save/output LAS files based on selected shape and text of block boundaries (tile index)? The TerraScan User Guide is pretty ...
2
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1answer
270 views

Extracting LiDAR metrics with TerraScan

I want to extract from a las file statistics such as height percentiles (percentile 95, for example) among others. I can do it with Fusion (using Cloudmetrics and Gridmetrics tools), but I would like ...
2
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1answer
124 views

Tracking which LiDAR data tiles have been delivered

My company works with LiDAR data for large electrical transmissions systems (thousands of miles in one project). We model the transmission lines and do analysis using CAD and GIS workflows. We break ...
1
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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 ...
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1answer
66 views

Displaying point cloud footprint from PostGIS using GeoServer and OpenLayers?

I'm using PDAL to import LAS files into PostGIS. The tutorial provided by boundless is great, and shows how to display the data in patches, but it doesn't cover displaying the table 'footprint'. ...
4
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0answers
54 views

How to get NIR values into a LAS file then a CSV?

We are trying to deliver a LAS file with NIR values added for each point. The NIR comes from a raster captured at the same moment as the LiDAR, and is stored as an 8bit number along with RGB in 8bit. ...
3
votes
0answers
69 views

Visualizing elevation profile across a whole mosaic dataset?

I'm working with many DEMs derived from LiDAR data (IMG format) in a mosaic dataset. This allows me to create hillshade (or shaded relief) functions to display the data, which is great. However it ...
3
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0answers
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 ...
3
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0answers
2k views

Simulate flood to assess Asset inundation footprints

I am trying to evaluate a number of flood gauges to assess at what levels of river height different flood risks would need to be issued. The gauges are currently set to warn of flood a couple of ...
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 ...
2
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0answers
48 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 ...
2
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0answers
227 views

CPUs to process lidar data using ArcGIS for Desktop?

I am looking to build a computer to process data in ArcGIS 10.2.2. The main use will be to rasterize 10-100's GBs of lidar data. However, I am unclear as to the capabilities of ArcGIS 10.2.2 to ...
2
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0answers
68 views

Oriented stereopair in ERDAS

I am trying to orient a set of intensity LiDAR images in ERDAS Stereoanalyst for stereo digitizing. The set is consisted of an intensity image and its stereomate. Stereoanalyst is configured for ...
2
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0answers
366 views

Format of raw LiDAR data (time-of-flight data)

I am doing a project where I need to simulate LIDAR data, and I am looking for specifications on how raw LIDAR data looks. I want the format of the data before it is translated to x,y,z coordinates (...
2
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0answers
148 views

Mine Grid to UTM

I have been given spatial data (lidar) that was collected in mine grid feet in ASCII format. I am using arc to process but need to define a projection does anyone know how to do this or any other ...
2
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0answers
71 views

Opengeo and Ubuntu memory issue

I was working with LiDAR in Opengeo suite while following the Boundless tutorials (http://workshops.boundlessgeo.com/tutorial-lidar/) In my recent post titled 'LiDAR and Opengeo', I mentioned about ...
2
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0answers
356 views

Extract road defects from terrestrial LiDAR, in Erdas 2012 or ArcGIS10.1

I'd like to extract road defects from a lidar point cloud. So, wherever a road surface drops or raises by a few mm relative to 100 cm around it. I know it's possible but I just can't find or figure ...
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0answers
22 views

Can I use georeferenced jpeg raster as map layer in GeoJSON.io?

Can I use georeferenced .jpeg raster as map layer in GeoJSON.io? I thought that I could, but it doesn't work. I converted .tif raster visualization of LiDAR data to georeferenced jpeg. After this, I ...
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0answers
128 views

Difference in the elevations for the same building on two DSMs saved in *.asc and *.laz formats

The following question concern the same type of data as the one I've asked in Differences in the longitude and latitude between a LiDAR DSM and an optical image. Basically, I've downloaded a tile of ...
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0answers
31 views

Installing LASzip in Ubuntu?

I have tried without any success to install LASzip¹ ² (paper by Isenburg about LASzip) on Ubuntu 16.04. The basic way gave me nothing relevant: ./configure && make & checkinstall ...
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0answers
55 views

Thinning LiDAR points to remove redundant neighbors?

I'm trying to develop a workflow in ArcGIS with 3D Analyst or Spatial Analyst to intelligently thin a grid of spot elevation points created from a LiDAR DEM. The current point spacing is 1 meter. Some ...
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0answers
77 views

Reduce Z value precision in QGIS

The .asc LiDAR files provided by the environment agency have height values provided to a precision of the level used to measure atoms. How to quickly lose a few of the pointless digits on the end to ...
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0answers
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 (...
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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 ...
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0answers
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 ...
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0answers
40 views

Finding specific area with coordinates out of a lot of LAS data?

I would like to extract spatial data out of a great amount of LAS data. Unfortunately, there is no index or sth that could help me find which file is for what area. Also, it is not possible to ...
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0answers
185 views

Orthogonal correction of building footprints after extracted from a raster

I have ArcGIS 10.1 and am working on a project involving extraction of vegetation and building classes from LIDAR (unclassified) data and aerial imagery (resolution 30x30cm). I have managed to ...
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0answers
88 views

Using GPS to field walk through a LiDAR scene

I am doing field surveying for archaeology using Lidar. If I attached a USB GPS to my laptop would it be possible to track where I am "in real time" on the Lidar as I am field walking? I'm wanting to ...
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0answers
166 views

LiDAR dataset displaying 500 meters to the east of correct position

Why does my LIDAR dataset show up ~500 meters to the east of the correct position even though a spatial reference/coordinate system is provided? Some background: The LIDAR data were downloaded from ...
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0answers
191 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 ...
0
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0answers
27 views

How to transfer x, y, and z values from LAS/LiDAR file to GeoTiff using Python?

I have LAS files containing x, y, and z coordinates from LiDAR point cloud data, and with python I can get one single attribute (elevation, or z points) to transfer to a GeoTiff via interpolation and ...
0
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0answers
32 views

Representing multiple polylines in unique vector layer?

I have imported a layer which contains a lot of lines. They overlap each other in a cross kind of pattern. When zoomed out it can look like this: When zooming in on one of the broader lines it ...