SAGA
 SAGA (System for
Automated Geoscientific Analyses) is a hybrid Geographic Information
System (GIS) software for the analysis of spatial data.
It features an 'Application Programming Interface' (API) for
geographic data processing. This API makes it easy to implement new
algorithms. The
SAGA API supports grid data, vector data, and tables.
It has a fast growing set of geoscientifc methods, bundled in
exchangeable Module Libraries.
Features include:
- File access: interfaces to
various table, vector, image and grid file formats
- Filter for grids: gaussian, laplacian, multi direction lee
filter
- Gridding: interpolation from vector data using
triangulation, nearest
neighbour, inverse distance
- Geostatistics: residual analysis, ordinary and universal
kriging,
single and multiple regression analysis, variance analysis
- Grid calculator: combine grids through user defined
functions
- Grid discretisation: skeletonisation, segmentation
- Grid tools: merging, resampling, gaps filling
- Image classification:cluster analysis, box classification,
maximum
likelihood, pattern recognition, region growing
- Projections:various coordinate transformations for vector
and grid
data (using Proj4 and GeoTrans libraries), georeferencing of grids
- Simulation of dynamic processes: TOPMODEL, nitrogen
distributions,
erosion, landscape development
- Terrain analysis:slope, aspect, curvatures, curvature
classification,
analytical hillshading, sink eliminition, flow path analysis, catchment
delineation, solar radiation, channel lines, relative altitudes
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