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

learn more… | top users | synonyms

1
vote
2answers
22 views

Use laspy to create las file from scratch without opening an existing las file first

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 ...
1
vote
0answers
27 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 ...
1
vote
0answers
30 views

Getting points from a particular section of point cloud data [closed]

I have a las file and I'm trying to analyze it using ArcGIS/ArcPy. Are there any built-in functions that I can use (maybe using a tool or las data property) to isolate a chunk of points? I want to be ...
1
vote
2answers
48 views

Converting las files from version 1.2 to 1.3

I have lidar data set which initial waveform data is in LAS 1.3. The classified point cloud needs to be delivered in the same version, but my processing software (TerraSolid V15) allows me to write ...
2
votes
4answers
93 views

Export ground returns (.las) from classified point cloud

I have lidar data that is classified as several categories (water, ground etc.). I need to open this lidar data in some software (it will be great if it would be a open source software) and delete a ...
3
votes
1answer
42 views

Clip multiple .las files data to polygon shapefile using FUSION

I followed this thread in order to clip .las data based off of a polygon shapefile. However I have over 100 .las files I need to clip based off of this polygon and merged into a single .lasd file and ...
1
vote
1answer
105 views

Clipping 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 ...
3
votes
2answers
101 views

LiDAR GUI tool for selecting and saving groups of points?

I'm working in a small group that is processing LiDAR data with some custom code. We need to see how well our stuff is working so we need samples of "truth" data that we can compare our output ...
2
votes
1answer
76 views

Convert from shapefile or raster formats to LAS (preferably free)

I am looking for a solution to convert either from ESRI shapefile format to LAS or from a common raster format to LAS. I have access to following software: ArcGIS 10.2 for Desktop (arcinfo with ...
0
votes
3answers
60 views

LAS .PTC classes into ESRI LAS to Mulitpoint

We have some Lidar data that has been classified based on visable features (i.e. trees, streets, buildings, etc.) These LAS data are used inside inside Microstation w/ TerraScan connected to a PTC ...
2
votes
2answers
179 views

Las dataset to raster with ground points only

I'm trying to make a raster from a las dataset. I want to only use points classified as ground, but I can't figure out how to do this. What I've tried is: Create las dataset from 2 .las files. ...
0
votes
0answers
16 views

Viewing, classifying, and processing LAS data using free open source software? [duplicate]

Is there a pipeline for viewing, classifying, and processing LAS data using free open source software?
1
vote
1answer
48 views

Georeferencing las files using liblas

I am trying to write georeferencing information to a '.las' file using liblas and c++. Here is my code: ofstream ofs; ofs.open("test.las", ios::out | ios::binary); liblas::Header header; ...
3
votes
0answers
105 views

Classification of above ground LiDAR points in ArcMap

I recently used the LAS Dataset toolbar to classify a .lasd file. The process classified the majority of points as unassigned with the rest being ground points. The study area has many tall buildings ...
8
votes
1answer
211 views

How to georeference LAS files?

First of all, I am a newbie in GIS. I have a lidar point cloud with GPS and telemetry data associated. Then, I transform coordinates of every point to an ECEF coordinate system and finally I ...
2
votes
2answers
71 views

Selecting percentage of points from multipoint layer (ArcGis)

I am currently working with las dataset of small area, and I want to run some quick analysis on this area. Since my PC is not the best, I am looking for tool like "extract 50% of multipoints to new ...
3
votes
0answers
150 views

How complete are the Fusion tools in QGIS?

How complete are the Fusion tools in QGIS? I have them installed and (vaguely) working, but there are only about ten of them. Is the idea of having just a few tools available, that one can use ...
3
votes
1answer
116 views

What's the deal with “degradation” and lastools?

I've read a few cautions online and heard a few from colleagues. If you don't purchase a license for lastools, the non-open-source functions will somehow degrade your data or results? Is this true? ...
1
vote
0answers
143 views

laspy reading las file

New to laspy and encountering an error. The first code block describes the file header, the second (In[24]) fails to open the file with laspy: In [21]: import numpy import laspy from laspy.file ...
4
votes
2answers
180 views

How to filter LiDAR data by scan angle?

I am looking to filter LiDAR data (.las format) by scan angle specifications (e.g. keep all points < 15). From a basic Google search, it appears that the LibLAS library has the ability to filter by ...
4
votes
2answers
185 views

Problem with Y offset shift of LAS file (las2las)

I'm trying to set the origin of a georeferenced .las point cloud to be coordinates 0,0,0, essentially stripping the georeferencing. The only way I could think to do this was subtract the minimum X, Y ...
3
votes
1answer
95 views

Shifting an entire .las file in Z?

I have a set of .las tiles. I needed to edit one of the tiles in Trimble's Inpho DTMaster to remove some noise. The coordinates are correct in the program, showing a my desired elevation. On export, ...
2
votes
2answers
96 views

Rename las files with Python [closed]

I have a bunch of LAS files that have been delivered with different naming conventions. I want to rename the files to all have the same uniform naming - based on the easting and northing coordinates ...
3
votes
1answer
382 views

How to convert LAS file to ASCII for DSM in SAGA GIS? [duplicate]

I want to count trees in SAGA GIS and when I try to follow the steps in dominoc925.blogspot.com, there was no problem with asci file (i have converted las file (dem)) but there was a problem with dsm ...
2
votes
1answer
183 views

When to reproject LAS data?

I've downloaded a few LAS files from the NOAA: http://www.csc.noaa.gov/digitalcoast/data/coastallidar I used lasinfo to get the coordinate system of the LAS files and it returned: ...
3
votes
3answers
761 views

How to determine bare earth from unclassified LAS file

I have data in LAS format with RGB values created from Aerial photogrammetry using a UAV. I am trying to find a solution to extract the bare earth to create my DTM from the DSM. I have tried SAGA, ...
1
vote
0answers
126 views

Adding LAS files (or derivatives of) to mosaic error in ArcGIS

I am trying to add LAS tiles, (or lastools derived .tif or .img tiles of the same LAS tiles) to a mosaic in arc 10.2 and am getting the following errors: Error: 8004201a : Insufficient information ...
2
votes
2answers
758 views

Installing LASTools to QGIS on a Mac (or other LAS processing plugins)

I recently saw this link how to install LAStools toolbox to QGIS. The problem is that the instructions are only for Windows users. Now I wonder if it's possible to install LAStools on a Mac with QGIS ...
3
votes
3answers
269 views

Removing duplicates from large LAS files

Are there any publicly and free (not necessarily open-source) applications that can remove duplicate points from LiDAR clouds? I would like something on the lines of lasduplicate -unique_xyz, which ...
2
votes
3answers
167 views

What can I do with lidar returns of 6 or greater in LAS 1.2 specification?

I have lidar LAS data that contains a number of points that represent returns 6 or 7. The data is supposed to be in ASPRS LAS 1.2 specification, which does not allow return numbers (echos) greater ...
3
votes
3answers
1k views

Creating DSM and DTM from a LAS using a freeware solution

Is it possible to export a surface and terrain model files from an aerial, LiDAR point cloud (LAS) set? I am using SAGA GIS for very basic operations, but I couldn't find this option (and I have a ...
7
votes
3answers
2k views

How to clip LAS data using shapefile polygons and open source software?

I am trying to clip or filter lidar files (las, xyz) using a shapefile that contains multiple polygons. Is there open source software that can do this spatial operation? My las files are enormous, ...
1
vote
1answer
402 views

Import a .las-file into QGIS 2.0.1? [duplicate]

I want to import a .las-file into QGIS 2.0.1. My guess is that I need to convert it into a format that is readable in QGIS. But how? I tried using LASTools. I downloaded it, but I don't understand how ...
4
votes
1answer
1k views

Drawing irregularly shaped boundary polygon around set of LAS points using ArcMap?

I am working with a set of LAS data which is irregularly shaped, picture a starfish as the point coverage, surrounding the starfish may be water on one side, may be more land elsewhere but no points ...
2
votes
1answer
148 views

Laz LiDAR files display extremely long thin line of points

I am having difficulty properly visualizing aerial LIDAR data from the csc.noaa.gov source. Taking any of the .laz files, the point cloud displays as an extremely long thin line of points. Zoomed in, ...
23
votes
2answers
4k views

Proper workflow for LAS to DEM conversion

I regularly come across LiDAR (.LAS) files with elevation data. When I do, I always struggle to find a way of converting them to a DEM for hydrological analysis. I have developed several workflows, ...
1
vote
1answer
167 views

How to add LiDAR Intensity attribute to a point feature class?

I need to convert LASD (ESRI LAS Dataset) to ASCII text file. I've export the data to point feature class (LAS to Multipoint), converted multipart to single part and calculate X Y and Z.My first ...
2
votes
1answer
371 views

Load LAS files in MapInfo

Is it possible to open LAS files within MapInfo? If so, how is accomplished in MapInfo 10.0?
6
votes
5answers
4k views

Easy way to create a boundary polygon shapefile from a set of LAS files using ArcGIS 10?

I have a bunch of LAS file sets that I need to process. The current task at hand is to generate a "footprint" shapefile that contains polygons for each LAS tile. I am looking for a graceful way to ...