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.
14
votes
13answers
15k views
How to a convert LiDAR XYZ files to DEM / DSM?
Normally consultants (LiDAR survey) provide me with data to my specifications; already in ESRI GRID or ASCII GRID format. This way LiDAR data can be easily used with ArcGIS.
This time I only have xyz ...
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 ...
13
votes
6answers
3k views
Methodology for creating accurate drainage networks (and catchments) from high resolution LiDAR DEM?
This is not the first time I've stumbled over this issue; it seems that I am unable to generate a correct drainage network model and the resulting catchments from full resolution (1m cells) LiDAR ...
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 ...
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 ...
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 ...
9
votes
7answers
602 views
What is the best way to visualize multiple large LIDAR tiles?
I want to load approximately 10 large LIDAR tiles for analysis. I have tried using ArcScene but it appears there is a limit on how much data ArcScene can handle at one time. Each tile is 65-90MB in ...
9
votes
4answers
888 views
comparing two DEMs
i have two Lidar las files, one is original let's say with X points. And the other is copy of the first las file but with Y points, where Y is less than X. Now, i wanted to compare how the Digital ...
8
votes
3answers
924 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. ...
8
votes
2answers
899 views
How do I combine high resolution and generalized hillshade rasters to produce enhanced shaded relief?
I often add LiDAR data to a map along with a shaded relief. Most of the time i have to generalize the LiDAR dem depending on the scale of the map. Still, there is often too much detail and mountain ...
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? ...
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. ...
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, ...
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).
...
6
votes
8answers
843 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.
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?
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?
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 ...
6
votes
3answers
313 views
Grass v.rast.stats returning null values
I have a vector layer (polygon) and a raster layer. The raster layer holds values for height above bald earth in a field called "value". I'd like the vector layer to inherit either the mean or the ...
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) ...
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 ...
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 ...
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 ...
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 ...
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 ...
4
votes
2answers
731 views
How to build 3D building models from lidar data?
Aloha to all and thanks for helping me.
I have Lidar data, ground points and first returns. I have processed it and have ready tiles from which I am trying to build 3D building models.
So far I was ...
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 ...
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 ...
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?
...
4
votes
2answers
407 views
comparing two TINs
i have the following two files:
1) LiDAR las file1
2) Let's give it a name LiDAR las file2, contains the same file1 data, where number of points randomly removed.
So if file1 contains X number of ...
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, ...
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 ...
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
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
2answers
238 views
Where I can find real world data for triangulation?
I want points for practicing triangulation algorithms.
Just points with coordinates [X,Y] and elevation [Z] of real world terrain.
I can use Google Maps Elevation API, but there is no method how to ...
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 ...
2
votes
4answers
839 views
What are Limits on ArcScene and LiDAR?
I am trying to load anywhere from 5 to 10 LIDAR TINS into ArcScene. I am using ArcGIS Desktop Evaluation (student) 9.3.1. I just built a new computer with a AMD Phenom II X6 1090T six core processor, ...
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 ...
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 ...
2
votes
2answers
2k views
Converting xyz batch to ESRI grid format using XYZ2GRID 2.1 - batch problems
I am trying to use Min-Lang Huang's XYZ2GRID2.1-Batch program downloaded from ArcScripts and I keep getting the error
C:\users\public...........xyz Error-Object required
Does anyone know what the ...
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 ...
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 ...
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
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
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 ...
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 ...
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 ...
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 ...
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
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
