RSAGA-package {RSAGA} | R Documentation |
RSAGA provides access to geocomputing and terrain analysis functions of SAGA from within R by running the command line version of the free GIS software SAGA (>=2.0.2). In addition, several R functions for handling and manipulating ASCII grids are provided, including a flexible framework for applying local or focal functions to grids.
Package: | RSAGA |
Type: | Package |
Version: | 0.9-0 |
Date: | 2007-11-08 |
License: | GPL |
RSAGA provides direct access to SAGA functions including 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. Furthermore, functions are provided for conveniently picking values at point locations from a grid using kriging or nearest neighbour interpolation.
RSAGA requires the free SAGA GIS (>=2.0.2) and its user-contributed
modules to be available on your computer. These can be downloaded under
GPL via http://www.saga-gis.org/ or directly from
http://sourceforge.net/projects/saga-gis/. In addition to the
SAGA command line version required for RSAGA, the download also included
a graphical user interface (SAGA GUI). Please check rsaga.env
to make sure that RSAGA can find your local installation of SAGA.
Finally thanks to Olaf Conrad, Andre Ringeler and all the other SAGA developers and contributors providing this excellent geocomputing tool!
Alexander Brenning <brenning@uwaterloo.ca>