The GREAT-ER desktop version, available since November 2003, replaces the previous Arc-View GIS implementation of GREAT-ER 1.0x, first released in 1999. Thus, GREAT-ER desktop is the full featured version of the GREAT-ER model for the advanced user. It is based on the platform-independent and free GIS data viewer 'THUBAN'. The menu items in the desktop interface allow the most common GIS operations, and are ordered according to the usual flow of a simulation session, i.e. Substance, Catchment, Environment and Simulation. All available (Nov. 2003) catchments are included on the GREAT-ER desktop CD.

As of January 2011 the distribution of GREAT-ER desktop CDs has been discontinued due to software compatibility issues. We are considering the development of a new version of GREAT-ER with fully updated software. We apologize for the inconvenience. To note that GREAT-ER web is still operational.

To install the GREAT-ER desktop single user version the following equipment is needed:

• MS Windows 2000 or XP, or Linux operating system (Windows Vista not tested yet)
• CD-Rom player
• Processor 800 MHz or better
• 256 MB RAM or more
• 1 GB free disk space or more
• No other Oracle software installed
• Adobe Reader
• Administrator privileges

For client-server installation in a network, please consult the installation manual.

The repository of GREAT-ER is a structured collection of substance data and documents. All of this information may be stored and rechearched in the database, sorted by categories.

this way, it is quite easy to share your input data, results, reports, etc. with other users. The structured substance data entered in the substance data part of the repository, can directly be used as basis for a GREAT-ER simulation.

For more information please refer to the README file at the Intevation ftp site .