GRASS accepts a variety of raster and some vector dataformats - most of the raster formats are equal to standard image formats (8/24 bit as well as negative values). Check the introduction or the documentation for details. The following table gives an overview of the features integrated in GRASS GIS.
Main topic | Modules |
Raster analysis | Automatic rasterline and area to vector conversion |
Buffering of line structures | |
Cell and profile dataquery | |
Colortable modifications | |
Conversion to vector and point data format | |
Correlation / covariance analysis | |
Expert system analysis | |
Map algebra (map calculator) | |
Interpolation for missing values | |
Neighbourhood matrix analysis | |
Raster overlay with or without weight | |
Reclassification of cell labels | |
Resampling (resolution) | |
Rescaling of cell values | |
Statistical cell analysis | |
Surface generation from vector lines | |
3D-Raster (voxel) analysis | 3D data import (intuitive ASCII: x y z Format) |
3D masks | |
3D map algebra (r3.mapcalc) | |
3D interpolation (IDW, Regularised Splines with Tension) | |
3D Visualization (isosurfaces) | |
Interface to Vis5D visualization tool | |
Vector analysis | Contour generation from raster surfaces (IDW, Spline algorithm) |
Conversion to raster and point data format | |
Digitizing with board or on screen (scanned raster image) with mouse | |
Reclassification of vector labels | |
Superpositioning of vector layers | |
Point data analysis | Delaunay triangulation |
Surface interpolation from spot heights | |
Thiessen polygons | |
Topographic analysis (curvature, slope, aspect) | |
Image processing | Canonical component analysis (CCA) |
Color composite generation | |
Edge detection | |
Frequency filtering (Fourier, convolution matrices) | |
Fourier and inverse fourier transformation | |
Histogram stretching | |
IHS transformation to RGB | |
Image rectification (affine and polynomial transformations on raster and vector targets) | |
Ortho photo rectification | |
Principal component analysis (PCA) | |
Radiometric corrections (Fourier) | |
Resampling | |
Resolution enhancement (with RGB/IHS) | |
RGB to IHS transformation | |
Texture oriented classification (sequential maximum a posteriori classification) | |
Shape detection | |
Supervised classification (training areas, maximum likelihood classification) | |
Unsupervised classification (minimum distance clustering, maximum likelihood classification) | |
DTM-Analysis | Contour generation |
Cost / path analysis | |
Slope / aspect analysis | |
Surface generation from spot heigths or contours | |
Visualization | 3D surfaces with 3D query (NVIZ) |
Color assignments | |
Histogram presentation | |
Map overlay | |
Point data maps | |
Raster maps | |
Vector maps | |
Zoom / unzoom -function | |
Map creation | PPM-image maps |
Postscript maps | |
HTML maps | |
SQL-support | Database interfaces (ODBC, PostgreSQL) |
Other modules | Erosion modelling (AGNPS 5, ANSWERS, TOPMODEL) |
Landscape structure analysis | |
Solution transport | |
Watershed analysis | |
Geostatistics | Interface to "R" (GNU S) (a statistical analysis environment) |
Here is a detailed page
about the integration
of simulation models.
Click here
for a list of the modules included in the GRASS Linux binary package (the
source code offers some more modules).