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GRASS modules
Here you will find some modules i have programmed for the GIS GRASS. Most of them are part of the GRASS-6.3-cvs version.
Non official GRASS modules
- r.in.onearth Download and import satellite images direct from the NASA onearth WMS server into GRASS.
- GRASS Testsuite
The latest test results are avialable here result and with valgrind memcheck memcheck result-
A small and simple Testsuite for GRASS. This suite tests some of the grass modules of correct return value and makes some data validation. Take a look at the test suite tutorial listed below.
Modules which are official part of GRASS (6.3 CVS version)
- r.out.vtk A module which exports 2D rasterdata from GRASS into the VTK ascii data format.
- r3.out.vtk A module which exports 3D voxeldata from GRASS into the VTK ascii data format.
- v.out.vtk A module which exports vector features from GRASS into the VTK ascii data format.
You can displrraview or MayaVi
- r.to.rast3 converts 2D rastermap slices in to the 3D voxelformat of GRASS.
- r.to.rast3elev Creates a 3D volume map based on 2D elevation and value raster maps
- r3.to.rast Converts 3D voxelmaps in to 2D rastermaps.
- r3.cross.rast Creates a cross section 2D raster map from one G3D raster map based on a 2D elevation map.
- r.gwflow Numerical calculation program for transient, confined and unconfined groundwater flow in two dimensions
- r3.gwflow Numerical calculation program for transient, confined groundwater flow in three dimensions
- r3.univar Calculates univariate statistics from the non-null 3d cells of a raster3d map
- r3.stats Generates volume statistics for raster3d maps
Partial differential equation library gpde (GRASS 6.3 CVS version)
The GRASS partial differential equation library is designed to support the solution of PDE's within GRASS.
Therefore it provides functions to create and solve linear equation systems.
The library design is thread safe and supports threaded parallelism with OpenMP.
Most of the available solvers (expect the gauss seidel and jacobi solver) and the assembling of the
linear equation systems are parallelized with OpenMP. The creation of a linear equation system can be done by using quadratic or sparse matrices.
Sparse and quadratic matrices are supported by the iterative equation solvers, the direct equation solvers only support regular quadratic matrices.
The link to the doxygen documentation:
gpde library
Documents
GRASS test suite presentation
- The pdf presentation is included in the lates test suite
Video tutorials
- r3.out.vtk Tutorial
- GRASS Testsuite Tutorial
GRASS modules in action
Combined image of the Landsat TM 7 satellite bands, imported with r.in.onearth direct into GRASS. The location is the
Harz in middle germany, a low mountain range.
The bands from left to right: Blue, Green, Red, Infrared 1, Infrared 2, Infrared 3, Thermal Infrared H, Thermal Infrared L, Panchromatic,
Visual Colors red-gree-blue combined as RGB map (d.rgb), Pseudo Colors IR1-IR2-Red combined as RGB map (d.rgb)
Some GRASS and VTK related screenshots
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