RSAGA provides direct access to SAGA GIS functions including, for example, a comprehensive set of terrain analysis algorithms for calculating local morphometric properties (slope, aspect, curvature), hydrographic characteristics (size, height, and aspect of catchment areas), and other process-related terrain attributes (potential incoming solar radiation, topographic wetness index, and more). In addition, (R)SAGA provides functions for importing and exporting different grid file formats, and tools for preprocessing grids, e.g. closing gaps or filling sinks.
RSAGA adds a framework for creating custom-defined focal functions, e.g. specialized filter and terrain attributes such as the topographic wind shelter index, within R. This framework can be used to apply predict methods of fitted statistical models to stacks of grids representing predictor variables. Furthermore, functions are provided for conveniently picking values at point locations from a grid using kriging or nearest neighbour interpolation.
RSAGA requires SAGA GIS (versions 2.3.1 LTS - 6.2.0)
are currently supported) and its user-contributed
modules to be available on your computer. These
can be downloaded under GPL from
Please check the help page for
rsaga.env() to make sure that RSAGA
can find your local installation of SAGA. You may
need to 'tell' RSAGA where to find SAGA GIS.
Thanks to Olaf Conrad, Andre Ringeler and all the other SAGA GIS developers and contributors of this excellent geocomputing tool! Thanks to Rainer Hurling, Johan van de Wauw, Massimo Di Stefano and others for helping to adapt SAGA to and test it on unix and Max OSX.
Alexander Brenning, Donovan Bangs and Marc Becker
Brenning, A., 2008. Statistical geocomputing combining R and SAGA: The example of landslide susceptibility analysis with generalized additive models. In J. Boehner, T. Blaschke and L. Montanarella (eds.), SAGA - Seconds Out (= Hamburger Beitraege zur Physischen Geographie und Landschaftsoekologie, vol. 19), p. 23-32.
Conrad, O., Bechtel, M., Bock, M., Dietrich, H., Fischer, E., Gerlitz, L., Wichmann, V., & Boehner, J. (2015). System for Automated Geoscientific Analyses (SAGA) v. 2.1.4. Geoscientific Model Development, 8, 1991-2007
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