How to merge grd files programmatically, ideally in Python?
We currently get LIDAR data from the field in grd format. Sometimes this data is overlapping. This data gets fed into a python program that does some analysis. What I’m after is some way of...
View ArticleFiltering noise out from bare-earth DEM with terrace fields?
I have a 1m bare-earth DEM, derived from LiDAR data, representing a terraced landscape. For the sake of any subsequent use of the DEM (e.g., least-cost path, cost surface analysis, and the like) I am...
View ArticleClipping LAS data with multiple shapefiles
I am looking for a method to clip with multiple shapefiles (139 shapefiles polygon) a lidar.las file. I’m using the software Fusion, as described in: How to clip LAS data using shapefile polygons and...
View ArticleOpengeo lidar example: unable to use pdal [on hold]
There is an example online for generate 3d buildings from vector (2d building) and lidar data. A while ago I already went trough on the tutorial 2 times and generated 3d buildings from New York and San...
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Coordinate formatting for swath data – to polygon
I’ve got a CSV of Lidar coverage swaths in the below format. Each run or strip is tied together via run_id. I’m assuming L is for left, R is for right and M is for middle. EDIT: These are coordinates...
View ArticleUsing 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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Building extraction with LiDAR data (Improve Process)
I have the following process for automatically creating building outlines/footprints from Las files and was wondering if anyone can help improve it or has suggestions for other processes to use?...
View ArticleUse laspy to create las file from scratch without opening an existing las...
I have found instructions for creating a las file by opening an existing file, modifying it, then re-saving it. This re-uses the headers from the original file. But how do I create a new file from...
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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 as the wall...
View ArticleConverting 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...
View ArticleViewing 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 and...
View ArticleLasDatasetToRaster 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...
View ArticleCalculating coverage of vector polygon over other polygons?
I have a shapefile file that contains a LiDAR footprint and I’m trying to figure out how much a county is covered by the LiDAR footprint. Two separate shapefiles. The attribute table for the county...
View ArticleChange 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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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: 22717.000 31027.000 21.000 Min X Y Z:...
View ArticleExtracting above ground features from unclassified LAS [closed]
What’s the best way to vectorize features from LAS? I have “Classified” LAS files, however they were never processed for classification. Thus of 181 million points (9 tile sample) about 60% are class...
View ArticleConverting 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?
View ArticleHow does the offset values of LAS files relate to their coordinate system?
I have a conundrum concerning LiDAR data, the stored point offset, and the coordinate system. I process large amounts of LAS data in TerraScan (TS), which sits on top of Microstation (MS). I receive...
View ArticleConverting between coordinate systems for LAS file using LASPY
I am trying to convert a .las file from WGS84 to UTM17. I have some drone imagery that was used to generate a 3d point cloud/ .las file, but it is in latitude/ longitude instead of easting/ northing. I...
View ArticleClassifying individual trees from labelled LiDAR point cloud [duplicate]
This question already has an answer here: Extracting tree crown areas from remote sensing data (visual images and LiDAR) 5 answers
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