LIDAR: Difference between revisions

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* [http://mpa.itc.it/markus/grass61/demos/rlake/ Flood simulation] using [http://grass.ibiblio.org/grass63/manuals/html63_user/r.lake.html r.lake]. Includes fancy NVIZ visualization of Trento, Italy, by Markus Neteler.
* [http://mpa.itc.it/markus/grass61/demos/rlake/ Flood simulation] using [http://grass.ibiblio.org/grass63/manuals/html63_user/r.lake.html 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.


== Sample data ==
== Sample data ==

Revision as of 01:31, 25 October 2008

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.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

  • The v.swathwidith module by David Finlayson for planning surveys. (development page)

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.
  • LAStools are a set of simple command line tools (including source code) for converting to/from ASCII, viewing, comparing, and compressing LIDAR data.

Sample data

Widely used in GRASS tutorials

Other

  • USGS Center for LIDAR Information Coordination and Knowledge (aka CLICK) - USGS LiDAR point cloud distribution site
    http://lidar.cr.usgs.gov
  • 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

Links

  • libLAS - LAS 1.0/1.1 ASPRS LiDAR data translation toolset