SEXTANTE: a gvSIG-based platform for geographical analysis

Presentation | Presented

  • Victor Olaya, Universidad de Extremadura

The SEXTANTE project ( aims to develop a comprehensive set of extensions for gvSIG which add advanced spatial data analysis capabilities to it. This includes extensions for hydrological and geomorphometrical analysis, point pattern anaysis, image processing, or statistical analysis, among many others, and also basic raster and vector data handling tools.

All together, more than 160 extensions have been developed so far. Extensions can be run from the gvSIG GUI using a toolbox-like interface, and also from a command-line shell.

All the extensions are based on a set of foundational classes, specially conceived to ease the implementation of algorithms for geographical analysis, thus making them useful for other developers. This classes have been inspired by the internal architecture of SAGA(, overcoming some of its main limitations, such as the lack of flexibility in the design of graphical interfaces or the difficult combination of raster layers form different sources. While retaining its main advantages, the user experience has been improved.

Most SAGA modules have been ported to this platform (those developed by the saga core team and also those developed by the Sextante team, which up to this date has been the main contributor to this project), excluding those already implemented somehow in gvSIG, such as file I/O modules. New modules have also been added, and others have been improved.

The first version of the SEXTANTE analysis suite was release in June 2007 under a GPL license.

Supporting Files