LIDAR (Light 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.
0
votes
0answers
8 views
Input data format and read multiple files into Grass 6.4.1
I am trying to read in multiple (hundreds, thousand) LiDAR ascii files into Grass.
They contain elevation data.
I think I have managed one, and I can make a map of elevations, using File, Import ...
4
votes
1answer
111 views
How to repair and clean contours from high data resolution (lidar)?
I'm unsuccessfully trying to make a bathymetric map with contours extracted from Lidar data at 1 m resolution.
The extracted contours have a lot of artifacts like dangles and islands.
First I used ...
7
votes
1answer
70 views
How to decide possible areas for water retention using lidar
I have lidar imagery for a watershed and am trying to process it so that a landowner know if they can hold water on their property or where they can hole the water (this is the more important part).
...
3
votes
1answer
48 views
Problem with mcc-lidar
I am running mcc-lidar on a win7 64bits with 16gb of ram. Nevertheless when I try to process a las file with 1, 800 000 points using -s 0.5 and -t 0.3 the program tells me:
Error: insuficient memory; ...
2
votes
1answer
46 views
Help with Parameters for MCC-LiDAR
I am attempting to use MCC-LiDAR to reclassify points (.las) originally classified using TIFFS. However, I seem to either be misunderstanding what the parameters really mean or where to get the ...
7
votes
2answers
171 views
Huge point cloud laser data in PostGIS - Storing and Processing it
I wonder, how it's possible to store huge sets of laser scanned point cloud data in PostGIS, with the time-aspect for processing it in mind. I know, there exists a geometry-object Point in PostGIS. ...
1
vote
1answer
63 views
Grass 7 .las data import problem
I compiled Grass7 on Ubuntu 12.10, with liblas in order to run r.in.lidar and v.in.lidar. I now want to import .las data; the option in file -> import raster data -> LAS LIDAR points import is given ...
0
votes
0answers
55 views
arcpy Add Feature Class to Terrain error. LiDAR Processing Script
So here's another one for you ever so helpful StackExchangers (is that right?) Anyway, I'm writing a script to convert lidar data (in .las format) into a terrain without going through all the ...
0
votes
1answer
67 views
ArcGIS can't find Z value
My ArcGIS model used to handle .XYZ files well, but now it fails to recognize Z-value column as such - it either recognise no field at all, or it offers some defaults such as "OID".
Since the last ...
4
votes
2answers
144 views
how to retrieve average building height in urban areas?
I am looking for a way to collect data on the height profile of some cities over time. I don't need to produce a detailed 3D reconstruction of cities, nor do I need to detect and measure individual ...
1
vote
1answer
47 views
How do I install the las2ogr tool from liblas in Windows using the osgeo4w installer?
I was wondering if anyone has used the LAS2OGR tool? I heard about this from a previous post. The webpage gives the usage: http://www.liblas.org/utilities/las2ogr.html
las2ogr -i mydata.las -o ...
4
votes
3answers
146 views
Finding outliers with wrong Z values in LIDAR data
I have more than 2000 XYZ .txt files and I have to do QC: let's say I have file, which I converted to multipoint (or even singlepart feature). I have mean Z value for a file, but ... if most of the ...
6
votes
3answers
194 views
Can I use LASTools to classify point data?
I am presently using LAStools to analyse LiDAR data. Can LAStools classify the points into various features such as vegetation, roads, buildings etc? If so, how is it done?
11
votes
3answers
234 views
PostGIS interpolation / triangulation options
I'm looking for an open source workflow to automate DEM construction. We have a series of sites that fall within a LIDAR dataset. We want to create site specific DEM's for each site, and we're ...
3
votes
2answers
143 views
How to clip from a point layer using postgis?
I've loaded a LIDAR xyz file into a PostGIS2.0 database and created a 3D point geometry column ("tblCLOUD") from the data.
I've also loaded into the database a shapefile that contains six ...
1
vote
2answers
119 views
SAGA-GIS Produces different results in command line than GUI
I have been working on a lidar processing workflow using SAGA-GIS. I determined my workflow on a single tile in the SAGA GUI and now I need to batch the operations on 100 more tiles. I wrote a batch ...
2
votes
1answer
100 views
Lidar Elevations Data
I am trying to acquire a method of detecting sub cm elevation without manually measuring from the field. Can LIDAR data produce this for me? Example: A 1500 foot long pipe conveying water from one ...
1
vote
3answers
189 views
How to create a generalized polygon layer from a raster?
I have a tiff file where I have extracted vegetation in a height interval from LIDAR. At the moment the picture is kind of blurry with no data cells between vegetated cells. I would like to create a ...
5
votes
1answer
250 views
Floor height creation from Aerial Lidar/Imagery only
I was wondering if it is possible to generate the floor heights of buildings from aerial lidar? We don't have terrestrial lidar or stereo imagery. I don't need the ground DEM level or the roof (DSM) ...
2
votes
0answers
257 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 ...
4
votes
3answers
326 views
Do any open-source .Net libraries (commercially usable) exist for reading/writing LiDAR data?
I have a few LiDAR point data (.las files) with me. I would like to read the X,Y and Z from it using .Net. I found liblas, which is in C++ and I am not sure if it can be used commercially after ...
6
votes
5answers
269 views
Processing Full-waveform Lidar?
Does anyone know of a good software package for processing full-waveform lidar? Also, does anyone know of a good tutorial on processing full-waveform lidar?
13
votes
5answers
2k views
Best Software for LIDAR data?
I will be working with LIDAR data soon and have heard that ESRI Tools are not particularly well adapted to work with LIDAR Datasets.
What are the best alternatives in your opinion? Which are ...
7
votes
2answers
153 views
Aerial LiDAR: What is an acceptable resolution?
I am in the process of initiating a project involving laser scanning. The area to be scanned i s approximately 5000 km². We are initially going to use the data to create a solar potential application, ...
1
vote
1answer
53 views
LASToMultiPoint_3d
Trying to use the arcgis python command
LAStoMultipoint_3d as seen here.
I'm running the code snippet against one of my LAS files. It creates a .shp, sbx, shp.xml, shx and dbf file. However, the ...
4
votes
1answer
873 views
Lidar - Automated building extraction (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?
...
2
votes
0answers
34 views
ESRI LasDatasetBuilder
Does anyone know of any working examples leveraging the new ESRI ArcGIS 10.1 Lidar classes i.e LasDataSet or LasBuilderclass?
I've looked around on http://resources.arcgis.com/en/help/arcobjects-net/ ...
1
vote
1answer
305 views
Aligning coordinate systems: gpx, LiDAR, shapefile
I am working on a project based on a lidar data set (for use in LidarViewer in Linux, a basic x,y,z viewer) that was downloaded from #1 below at Opentopo.org and looking to add onto this data set with ...
8
votes
3answers
921 views
Best method to aggregate 1m DEM mosaic to 10m DEM
I have a mosaic of a 1m LiDar derived DEM. I need to output a subset of the data as a 10m DEM. I am currently using the aggregate tool in ARCGIS 10 to produce a mean value for each new 10m pixel. ...
10
votes
4answers
362 views
Dikes extraction from DEM
I do have DEM of 1x1 meter and original LiDAR point cloud in .las, that DEM is made of. I need to extract river dikes (highest points of the dikes) to vector feature (point, polyline). Any idea for ...
3
votes
2answers
225 views
Purpose of building footprints
What are the uses (public and private industry) of building footprints?
I'm trying to figure out how polygon building footprints can be used. i.e. are they used for determining tax liabilities, ...
1
vote
0answers
146 views
QGIS 1.7.4 crashes when using interpolation tool
I am currently using QGIS with Lidar data to produce hillshade images. I have split the lidar data in 20 files (31kb).
Some of the files are working some are not. I have checked the files xyz are ...
1
vote
0answers
22 views
ArcPublisher appears to be mirroring the ecw Lidar files on the southern axis of the file
ArcPublisher appears to be mirroring the ecw Lidar files on the southern axis of the file. Has anyone experience this? Is there a setting in ArcPublisher that I need to turn on or off? The way i ...
6
votes
1answer
281 views
Breakline detection algorithms for LIDAR dataset
I'm searching for algorithms or open source tools I could use to detect breaklines from a LIDAR dataset; more specifically, from the terrain points of the dataset. At the moment the only thing I've ...
1
vote
3answers
285 views
Where can I find the highest resolution shapefiles for counties or states
I am looking for a download source which has the highest resolution (greatest detail/accuracy) for all counties in the US. More specifically I run into this problem mainly when dealing with the ...
1
vote
2answers
427 views
Mosaicing LIDAR files in ArcGIS 10
I have a number of LIDAR files (the extension is .adf). When put together, they show the same area (each shows one part of it), so, before I do anything else with them, I would like to combine them ...
1
vote
1answer
301 views
Are there any open source software for obtaining and processing data from the Velodyne HDL-32E lidar?
Does anybody know if a FOSS package exists? The best I could find are the scripts at binarymillenium. I was just hoping somebody here knows of a complete package for obtaining and processing the data. ...
5
votes
2answers
295 views
Seeking commercial web service for LIDAR/DSM data in USA
I apologize for not knowing all the proper terminology to ask this question. I am seeking a commercial service for providing pay-per-use high resolution elevation data in North America. It must come ...
2
votes
2answers
2k views
Viewing .las format LIDAR data in QGIS?
Is there an easy path to visualizing this LIDAR data? I have QGIS, and some USGS LIDAR data in (.las) format downloaded from http://lidar.cr.usgs.gov/ . This means I have both the (.las) and ...
6
votes
8answers
841 views
Where can I get pointcloud data?
Is there any freely available pointcloud data?
I'm especially interested in dense clouds of small areas(5m to 100m radius) but anything else would be fine too.
1
vote
0answers
65 views
How to track raw data deliveries and determine when all input data has been delivered and is ready for processing [closed]
When working with large amounts of raw input data for your analysis, how do you track data from different sources and covering different geographic extents to determine when you can proceed with the ...
7
votes
4answers
612 views
How to distinguish buildings from vegetation in LIDAR data?
In order to extract the vegetation mask in ecognition, with object base analysis, with creation of the rule sets, the buildings were also classified! Any idea how to extract building from vegetation? ...
5
votes
1answer
618 views
How to display dynamic raster (lidar) data on a Web map?
I have some high quality LiDAR data. I need to process it dynamically, and update a field (not elevation field) depending on my input and elevation at that point. Once this is done, I need to display ...
2
votes
5answers
1k views
How to convert LAS to GRID/Raster for ArcGIS input?
I was wondering if there is an option to convert LAS (LIDAR data) to raster or GRID format that ArcGIS could read it.
Thanks.
2
votes
1answer
184 views
Get Cell Value Webservice for ArcGIS Raster (LiDAR) without using ArcGIS
I want to expose the getCellValue function on Lidar Data, as a web service. But I don't have access to ArcGIS (server or desktop).
What options do I have to fetch cell value, given lat lon, from a ...
1
vote
1answer
249 views
LIDAR data for Chicago
Is there any public or private sources of LIDAR data for the city of Chicago? Searching online has not lead me to any sources, and I am unsure how the commercial world of LIDAR works.
The LIDAR point ...
10
votes
3answers
879 views
optimize nearest neighbor query on 70 million extremely high density spatial point cloud on SQL Server 2008
I have about 75 million records in a SQL Server 2008 R2 Express database. Each is a lat long corresponding to some value. The table has geography column. I am trying to find one nearest neighbor for a ...
1
vote
1answer
149 views
How to display Lidar Data in ee0 (Interchange File) on Maps
Hi I have Lidar data in ee0 files (interchange files). Can i ovaerlay them on some maps like say Bing Maps or Geoserver with Open Layers?
If yes whats the right way of doing it?
Thanks
1
vote
2answers
265 views
Can REST or the ArcGIS API for Flex read VAT tables from a Raster?
When publishing a bare earth DEM that has a VAT table, or value attribute table "A VAT is a table containing attributes for a grid, including user-defined attributes, the values assigned to cells in ...
5
votes
4answers
1k views
Is there an 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 ...
