SAGA is a free and open source GIS program. It excels in performing analysis of raster files, but it also supports vector in the form of ESRI shapefiles. The native raster file format is the .sgrd, but other raster formats are supported, including ESRI and Surfer grids. SAGA is written in C++ with the ability for advanced users to code their own “modules” (tools/functions).
The following modules are standard:
SAGA's GUI. Unlike many other GIS programs, SAGA opens raster and vector files in separate windows, although they can be overlaid to create maps.
Flow chart illustrating the process the developers used to predicatively model the distribution of soils types in Germany using SAGA. Source: SAGA User Group (link to complete presentation in references.)
SAGA User Group Association. (n.d.). SAGA homepage. http://www.saga-gis.org/en/index.html
Böhner, J., et al. (2006). Digital Soil Mapping in SAGA GIS. Conference presentation. http://eusoils.jrc.ec.europa.eu/esdb_archive/ESBN/Esbn_Zagreb/Presentations/DSM/DSM_SAGA_Ringeler.pdf
SAGA User Group Association. (n.d.). References. http://www.saga-gis.org/en/about/references.html
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