LIDAR: Difference between revisions
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=== Import === | === Import === | ||
* | * {{cmd|r.in.xyz}} - Create a raster map from an assemblage of many coordinates using univariate statistics.<BR>([http://hamish.bowman.googlepages.com/grassfiles#xyz example]) | ||
* | * {{cmd|v.in.ascii}} - Import data from an ASCII file to GRASS vector format.<BR>''Limited to a few million data points unless topology and database creation is skipped with the '''-bt''' flags'' | ||
=== Analysis === | === Analysis === | ||
* | * {{cmd|v.outlier}} - Removes outliers from vector point data. | ||
* | * {{cmd|v.lidar.edgedetection}} - Detect the object's edges from a LIDAR data set. | ||
* | * {{cmd|v.lidar.growing}} - Building contour determination and Region Growing algorithm for determining the building inside. | ||
* | * {{cmd|v.lidar.correction}} - Correction of the v.lidar.growing output. It is the last of the three algorithms for LIDAR filtering. | ||
=== Surface generation === | === Surface generation === | ||
* | * {{cmd|v.surf.rst}} - Spatial approximation and topographic analysis using regularized spline with tension. | ||
* | * {{cmd|v.surf.idw}} - Surface interpolation from vector point data by Inverse Distance Squared Weighting. | ||
* | * {{cmd|v.surf.bspline}} - Surface interpolation from vector point data by bicubic or bilineal interpolation with Tykhonov regularization. | ||
* | * {{cmd|r.fillnulls}} - Fills no-data areas in raster maps using v.surf.rst splines interpolation. | ||
== Swath Bathymetry Tools == | == Swath Bathymetry Tools == | ||
| Line 41: | Line 41: | ||
== LIDAR Tools == | == LIDAR Tools == | ||
* | * {{cmd|r.terraflow}} - computation of flow direction, flow accumulation and other basic topographic terrain indices from massive raster digital elevation models (DEM). From the Duke University [http://terrain.cs.duke.edu/ STREAM] project. | ||
* [http://mpa.itc.it/markus/grass61/demos/rlake/ Flood simulation] using | * [http://mpa.itc.it/markus/grass61/demos/rlake/ Flood simulation] using {{cmd|r.lake}}. Includes fancy NVIZ visualization of Trento, Italy, by Markus Neteler. | ||
* [http://www.cs.unc.edu/~isenburg/software/ LAStools] are a set of simple command line tools (including source code) for converting to/from ASCII, viewing, comparing, and compressing LIDAR data. | * [http://www.cs.unc.edu/~isenburg/software/ LAStools] are a set of simple command line tools (including source code) for converting to/from ASCII, viewing, comparing, and compressing LIDAR data. | ||
* [http://www.liblas.org libLAS] ASPRS LiDAR data translation tools | |||
== Sample data == | == Sample data == | ||
| Line 82: | Line 84: | ||
== Links == | == Links == | ||
* [http://liblas.org/ libLAS | * [http://liblas.org/ libLAS}} - LAS 1.0/1.1 ASPRS LiDAR data translation toolset | ||
[[Category:Documentation]] | [[Category:Documentation]] | ||
Revision as of 08:24, 28 January 2009
LIDAR and Multi-beam Swath bathymetry data
Modules
Import
- r.in.xyz - Create a raster map from an assemblage of many coordinates using univariate statistics.
(example)
- v.in.ascii - Import data from an ASCII file to GRASS vector format.
Limited to a few million data points unless topology and database creation is skipped with the -bt flags
Analysis
- v.outlier - Removes outliers from vector point data.
- v.lidar.edgedetection - Detect the object's edges from a LIDAR data set.
- v.lidar.growing - Building contour determination and Region Growing algorithm for determining the building inside.
- v.lidar.correction - Correction of the v.lidar.growing output. It is the last of the three algorithms for LIDAR filtering.
Surface generation
- v.surf.rst - Spatial approximation and topographic analysis using regularized spline with tension.
- v.surf.idw - Surface interpolation from vector point data by Inverse Distance Squared Weighting.
- v.surf.bspline - Surface interpolation from vector point data by bicubic or bilineal interpolation with Tykhonov regularization.
- r.fillnulls - Fills no-data areas in raster maps using v.surf.rst splines interpolation.
Swath Bathymetry Tools
see also the Marine_Science#Multibeam_sonar_processing wiki page
- The v.swathwidith module by David Finlayson for planning surveys. (development page)
- An example of post-processing scanned paper sidescan swaths using thin plate spline warping with GDAL's "gdalwarp -tps" function. (debugging page)
- GRASS integration with MB-System (GPL) software for processing Multibeam and Sidescan Sonar data. GRASS + MBsys + GMT make a nice scriptable trio.
LIDAR Tools
- r.terraflow - computation of flow direction, flow accumulation and other basic topographic terrain indices from massive raster digital elevation models (DEM). From the Duke University STREAM project.
- Flood simulation using r.lake. Includes fancy NVIZ visualization of Trento, Italy, by Markus Neteler.
- LAStools are a set of simple command line tools (including source code) for converting to/from ASCII, viewing, comparing, and compressing LIDAR data.
- libLAS ASPRS LiDAR data translation tools
Sample data
Widely used in GRASS tutorials
- Jockey's Ridge, NC, LIDAR dataset
- North Carolina OSGeo Edu data set (includes multi-return LIDAR data)
Other
- United States Antarctic Resource Center: LIDAR High-resolution DEM Final DATA Downloads
http://usarc.usgs.gov/lidar_dload.shtml
- LIDAR ALSM Research, Arizona State University Ative Tectonics, Research Group
http://lidar.asu.edu/research.html and http://www.geongrid.org/science/lidar.html
- USGS Center for LIDAR Information Coordination and Knowledge (aka CLICK) - USGS LiDAR point cloud distribution site
http://lidar.cr.usgs.gov
- Washington State Geospatial Data Archive, Mount Saint Helens - Lidar Data
https://wagda.lib.washington.edu/data/type/elevation/lidar/st_helens/
- Puget Sound Lidar Consortium, public-domain high-resolution topography for western Washington
http://pugetsoundlidar.ess.washington.edu/index.htm
- NOAA Topographic Change Mapping LIDAR Data Retrieval Tool (LDART) NOAA Coastal Services Center
http://maps.csc.noaa.gov/TCM/
- Landmap, LIDAR Data from the Environment Agency
http://www.landmap.ac.uk/lidar/lidar.html
- Northern California LIDAR data
http://quake.usgs.gov/research/geology/lidar/ and http://core2.gsfc.nasa.gov/lidar/terrapoint/
- IDAHO GEOSPATIAL , Bare Earth LIDAR DEM Download - UTM
http://inside.uidaho.edu/geodata/LiDAR/LiDARBareEarthDEM_DownloadUTM.htm
- EarthScope Spatial Data Explorer - A java application for querying, browsing, and acquiring data from the EarthScope Spatial Data Repository. Currently includes a number of LiDAR datasets.
http://www.earthscope.org/data/lidar.php
- South Tyrol - Download of DTMs (Homepage in German or Italian)
http://www.provinz.bz.it/raumordnung/grundkarten/utm/default_d.htm
Links
- [http://liblas.org/ libLAS}} - LAS 1.0/1.1 ASPRS LiDAR data translation toolset