Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

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.

2
votes
1answer
32 views

Optimizing workflow for FUSION's PolyClipData?

I have multiple large LiDAR datasets (.laz) from different areas, where I need to extract buildings. I have prepared a shapefile containing a buffer around the buildings I care about, and are using ...
0
votes
0answers
23 views

Create point label LiDAR [duplicate]

Is there an easy way to add label/classes on every point of a LiDAR file (I can convert the file to ptx / LAS /LAZ)? I'm looking for a small "paint" program were I could easily apply labels with a ...
1
vote
1answer
68 views

Merging multiple LiDAR (.las) files?

I downloaded about 9 LiDAR scenes from USGS and I want to use ArcGIS to merge them so that I can carry out tasks on them together as opposed to one by one.
1
vote
0answers
25 views

Any way to install LASTools or LASzip on ubuntu 16.04 LTS without using WINE? [duplicate]

I cannot install WINE on my ubuntu 16.04LTS because of broken packages. Is there any way to install LASTools or LASzip on ubuntu without paying for it or using WINE software?
1
vote
1answer
83 views

Digitize objects in a LiDAR point cloud?

I am working with LiDAR point cloud data of road networks. The goal is to digitize all visible objects like hydrants, streets, sidewalks. My input data is available in LAS or ASCII format. My first ...
1
vote
2answers
62 views

Saving LAZ files to different location from input (LAS) files? [duplicate]

All of the command line examples I'm seeing show how to create LAZ files in the same folder as the LAS files, e.g.: C:\Folder\tools>laszip F:\Folder\LAS_points\*.las Unfortunately, I don't have ...
2
votes
1answer
54 views

Importing LiDAR point cloud classes in Potree?

I can't find a way to import classes (roof, vegetation, ground, etc..) in Potree. I generated the web page, except I get the black point cloud. When I, for example, open .las file in ERDAS Imagine, I ...
4
votes
2answers
319 views

Why did Esri create .zlas compressed LiDAR files instead of adopting .laz?

I am talking about the Esri Optimized LAS file format for compressed LiDAR files (.zlas). While the uncompressed format (.las) from ASPRS was adopted by practically the entire Remote Sensing and GIS ...
1
vote
2answers
83 views

Strange Pattern in LIDAR derived DSM raster

I produced a DSM raster from LIDAR data for eastern Kentucky. There are strange lines from southwest to northeast. Do you have any idea what those might be? I generated the DSM raster with both first ...
5
votes
1answer
80 views

LiDAR returns over water bodies?

I have obtained LiDAR data from my environmental agency in order to obtain the relative heights of each watercourse station. A far as I know, LiDAR signals do not get returned over water bodies. ...
0
votes
0answers
35 views

Downsampling lidar data - to have fewer points [duplicate]

I have a Lidar data (shp in ArcGIS) that contains millions of points (hundreds in each 10 m pixel of a Sentinel-2 image). Is there a way to reduce this - so that I will have say just 2 or 3 points in ...
1
vote
1answer
57 views

Clipping LiDAR tiles with vector data using LAStools?

So the problem is that I have a huge amount of LiDAR tiles (in .laz format), but need only part of them that are within the borders of the city. When I load all the tiles to LASTools, I have ...
1
vote
1answer
43 views

Converting .pcd LiDAR binary compressed file to .las format?

I have LiDAR data in the format of .pcd in a binary compressed file (version .7). How can I convert it into .las format or any other that can be readable by LAStools in ArcGIS 9.3 version ownwards? ...
2
votes
2answers
101 views

Reprojecting LiDAR data with libLAS error: “x scale and offset combination is insufficient to represent the data”

Disclaimer: This is a duplicate of this, a question without an answer. This is not, however, a duplicate of this, as it is a different error. I have a LAS file projected in EPSG:32636, and I need to ...
1
vote
1answer
59 views

Failed to install Potree on Ubuntu 18.04 Bionic

I am trying to install Potree on my computer and I am stuck. I am following these instructions: $ sudo apt-get install python-software-properties git $ sudo apt-get install build-essential cmake g++ $...
1
vote
1answer
28 views

PDAL pipeline could not connect to server: Connection refused

I am trying to import .las files to the postgres database. My pipeline is: { "pipeline":[ { "type":"readers.las", "filename":"data/pt000002.las", "spatialreference":"EPSG:4326" }, { "type":"...
1
vote
2answers
60 views

How to run PDAL pipeline with docker

I used to use PDAL with conda environment, and in that time I used pipeline command with the simple: sudo pdal pipeline -i /Documents/laz2pg.txt And that did the work. But, now, at the moment, I ...
0
votes
2answers
47 views

Availability of Frequent LiDAR Data in UK?

I am looking for LIDAR data of grasslands located all around UK with a spatial resolution of 1m and a frequency of at least once a week. I've already had a look at the Environmental Agency but their ...
0
votes
0answers
30 views

LiDAR Point Classification Program Recommendation [duplicate]

I'm working with terrestrial LiDAR data to create a reference data set and need to classify the points into either ground points or non-ground points. Automated/semi-automated methods don't seem to be ...
0
votes
1answer
39 views

PDAL works in Windows command but not in OSGeo4WShell? [closed]

I want to import a pointcloud into a PostGIS database. AFAIK you accomplish this with PDAL which comes with OSGeo4W. I was following this tutorial: OSGeo4W LiDAR tutorial and also this tutorial PDAL....
1
vote
1answer
76 views

Getting buildings multipatch from LiDAR data without building footprints?

I have a 3D LiDAR data and aerial images. Is there a way to obtain the buildings multipatch (.shp), given that I don't actually have the buildings' footprints?
1
vote
2answers
163 views

Installing PgPointCloud extension for PostgreSQL on Ubuntu Bionic

I'm stuck with the installation of the PgPointCloud extension for PostgreSQL. I found this article: https://connect.boundlessgeo.com/docs/suite/4.6/dataadmin/pointcloud/install.html But when I run ...
-2
votes
1answer
56 views

Loading LIDAR data to POSTGRES and use it with DJANGO [closed]

I have some project at the Faculty and I don't know from where to begin. I have point cloud data (LIDAR data) and I need to make the website with that data on it and with functions for some sort of ...
1
vote
1answer
41 views

PDAL error: “Couldn't create filter stage of type 'filters.cpd'”

I would like to use the cpd filter to transform a point cloud, but I am heading to the following error: RuntimeError: Couldn't create filter stage of type 'filters.cpd' which comes from the ...
0
votes
0answers
47 views

Load a .las file in QGIS 2.18.7 [duplicate]

Looking to load a .las file into QGIS so I can view it's coverage and extents. What is the best method to get this work quickly and efficiently?
2
votes
1answer
104 views

Naming conventions for LiDAR files?

I can't figure out what is specifically being referenced by the names of these .las files: They correspond to a specific quadrangle, but can't figure out quite how.
1
vote
1answer
89 views

JSON pipeline in Python doesn't create any output file?

I have ground LiDAR point cloud with some noise points. I would like to use filter.statistics in PDAL (in Python 3.6) using JSON pipeline to filter the noise out. json = """ { "pipeline":[ "/9A-...
1
vote
1answer
70 views

Visualizing extra bytes from LAS 1.4 in Potree?

I was wondering if it is possible to visualize the information that can be stored in the extra bytes of the LAS 1.4 file. This could be really helpful for validating features that have been calculate ...
3
votes
1answer
66 views

Masking LiDAR points to create DEM in ArcGIS Pro with ArcPy?

I have an irregular LiDAR point cloud dataset, so when I try to create a DEM or DSM, the points are connected across the irregular edges of the LiDAR point cloud. I thought that creating a mask ...
4
votes
1answer
122 views

Selecting LiDAR return point type in LiDAR dataset with ArcPy?

I am trying to create a Digital Earth Model (DEM) using ArcPy under ArcGIS Pro 2, but I am running into some problems. I can generate a DEM within ArcGIS Pro by selecting only the ground points ...
2
votes
1answer
188 views

Creating 3D polygon roof from LiDAR data using FME?

I have LiDAR data of a building and would like to construct a 3D Model using FME 2016. The LiDAR data shows that the structure has sloped roofs with various other elements on the roof surface (e.g. ...
1
vote
0answers
39 views

Error reprojecting point cloud with liblas 1.8: “latitude or longitude exceeded limits”? [duplicate]

I was previously reprojecting a point cloud in .las format using liblas 1.7.0 (with GeoTIFF 1.4.0 GDAL 1.10.1) as follows: las2las /tmp/input.las --a_srs EPSG:4326 --t_srs EPSG:3857 --scale 0.001 0....
4
votes
1answer
141 views

Is the ground level cross section of a normalised lidar dataset flat? [duplicate]

If I normalise a lidar dataset I am (according to my thinking) simply subtracting the first return heights from the ground heights. Thus the resulting dataset will only contains the height above ...
0
votes
1answer
114 views

Normalizing a digital surface model? [closed]

I am trying to generate a normalized DSM by subtracting the original DSM (oDSM) from the DTM. To generate the DTM I had to first use a median filter on the oDSM (remove noise) and then use a ...
2
votes
1answer
53 views

Elevation contours from .JP2 / .J2W files?

Is there a way in ArcGIS, Global Mapper, or CAD to generate elevation contours or any sort of surface data from a .JP2 file? I've never been provided this format before and our client is telling us ...
1
vote
1answer
78 views

How much do leaves on/off affect the number of LiDAR ground returns?

We would like to collect a generic purpose topographic LiDAR dataset over a large region in Belgium. Our minimum requirement is to achieve at least 1 point/m² on the ground. Ideally, we would like to ...
6
votes
1answer
143 views

Lidar DEM produces odd results related to topographic aspect

Background: ArcGIS Desktop 10.5.1, Spatial analyst We have acquired two bare-earth DEMs derived from lidar. YEAR2007 was produced in 2007, and YEAR2015 eight years later. Both are 32-bit, floating-...
1
vote
0answers
36 views

Fill gaps in dem created from .laz file [duplicate]

I've been trying to fill those lidar scan lines in my dem with no avail. Is there any way to interpolate those "gaps" to get a clean dem? I used las2dem to create the dem from .laz file
2
votes
1answer
139 views

How to write multiple .las files from polygon clipping with PDAL?

I am using PDAL (through Python) to crop multiple polygons from a point cloud and store them as separate files. For efficiency reasons I would like to define this in a single pipeline. However, using ...
1
vote
2answers
143 views

Merging LiDAR tiles without losing data in QGIS?

I'm trying to merge some LiDAR tiles together but when I do, the clarity of the image drops, so I think that means I am losing some data. How do I merge the tiles and keep all of the data and the ...
7
votes
2answers
170 views

Prevent SAGA in QGIS 3.0 from creating certain outputs?

I'm wondering if there is a way to prevent SAGA from generating temporary files. For example, if I just want to generate a slope map using SAGA I have to wait for all 11 other grids to get processed. ...
4
votes
1answer
92 views

Importing multiple .asc files into PostGIS violates check constraint. Why?

I am importing thousands of .asc files into PostGIS into this table: CREATE TABLE stg.COUNTRY_1M(rid serial primary key, rast raster); CREATE INDEX ON stg.COUNTRY_1M USING gist (st_convexhull(rast)); ...
2
votes
1answer
82 views

Converting DEM to LAS file? [duplicate]

Is there a way to convert a DEM raster to a .las file using open source software and/or any tools that come along with a complete ESRI license? I have been able to achieve this using the LAS Toolset ...
2
votes
1answer
200 views

How to import raster (.asc) data to PostGIS?

I am using Postgres 10.3 / Postgis 2.4.2, and I have thousands of ".asc" files (LiDAR DTM/DSM files) to import to the db. However, the format is something like: ncols 1000 nrows 1000 xllcorner ...
3
votes
1answer
90 views

Extracting only elevation data from NASA's GLAS Satellite LiDAR to create raster DEM?

I'm trying to open data downloaded from NASA's Earthdata site in ArcGIS 10.4.1. Specifically I'm trying to open "GLAS/ICESat L2 Global Land Surface Altimetry Data (HDF5) V034" (Image below, ...
2
votes
2answers
106 views

GRASS r.in.lidar (las to raster) inside Python loop?

I have a loop in Python to list out LAS files in a folder, and run two commands in Grass GIS on these files to write them out as rasters. The loop runs but at the end I get an arg must be string not ...
3
votes
2answers
168 views

Clipping object of class LAS with polygon shapefile using lidR?

I want to make a simple clip with my .las 3D-Pointcloud. Therefor I use the lasclip() function. Import .las: lidar <- readLAS("~/data.las") lidar gives me class : LAS (LASF v1.2) memory ...
1
vote
1answer
82 views

Batch processing LiDAR files (.las to raster) with PyQGIS?

for layers in glob.glob("*.las"): processing.runalg("grass7:r.in.lidar", "input_las",5,1,"",1,100,"","",5,"","",False,True,True,"331289.57265,337990.42735,4558790.0,4560890.0",0,layers+"E:/...
0
votes
0answers
33 views

PyQGIS code for r.in.lidar in pyQGIS for LiDAR DEM output? [duplicate]

processing.runalg("grass7:r.in.lidar", "PNOA_2016_CAT_huso31_346-4560.las",5,1,"",1,100,"","","1","","",False,True,True,"295165.831809,383949.483035,4552152.32354,4577352.32354",0,"E:/Rohan/Heimdall/...
5
votes
1answer
331 views

numpy array to GTiff using rasterio without source raster

I have a numpy array that represents rasterized data from a LiDAR point cloud. For example: import numpy as np import rasterio arr = np.random.randint(5, size = (100, 100)) I know information about ...