The SIAT is a specialist system for Land Evaluation derived from the MicroLEIS - Land Evaluation Information System developed in Spain. In its first version the 12 variables were adapted and adjusted for tropical conditions as well as the program structure and databank. In that time the field tests showed that the best results were obtained for scales near 1:100.000. In this second version the ranges for each variable were redefine and a communication interface with the GIS IDRISI was introduced, which allowed the exchange of data between the two programs. Another important modification was the adoption of an equation to calculate the erosivity in place of the original map as part of the User's Guide. The field tests showed that the use of the SIAT is now much more functional and presents a much better precision enabling the use of scales around 1:50.000, besides it can be adjusted all over the Brazilian territory. The SIAT V.1.4 can be downloaded from <A HREF="http://www.rc.unesp.br/igce/ceapla/biblioteca/softwares/siat.html">www.rc.unesp.br/igce/ceapla/biblioteca/softwares/siat.html</A>.
land evaluation; land suitability; GIS
