RSAGA-package {RSAGA}R Documentation

RSAGA: SAGA Geoprocessing and Terrain Analysis in R

Description

RSAGA provides access to geocomputing and terrain analysis functions of SAGA from within R by running the command line version of SAGA. In addition, several R functions for handling and manipulating ASCII grids are provided, including a flexible framework for applying local functions (including predict methods of fitted models) or focal functions to multiple grids.

Details

Package: RSAGA
Type: Package
Version: 0.9-4
Date: 2008-10-22
License: GPL-2

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. 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 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/. Please check rsaga.env to make sure that RSAGA can find your local installation of SAGA.

Thanks to Olaf Conrad, Andre Ringeler and all the other SAGA developers and contributors providing this excellent geocomputing tool!

Author(s)

Alexander Brenning <brenning@uwaterloo.ca>


[Package RSAGA version 0.9-4 Index]