soil salinity is a limiting factor for plant growth and a serious cause of land degradation. field sampling and statistical analysis for estimating soil salinity is expensive and time consuming. estimating soil salinity by spatial statistical models and geographic information system (gis) is recommended, because it saves labor and time. this study was conducted to evaluate the performance of sp...

Spatial Information Grid (SIG) is an infrastructure and framework which enable us to congregate and share large-scale, heterogeneous, distributed spatial resources across dynamic “virtual organizations”, to organize and manage spatial resources systematically. In order to enable the users and soft agents to locate, select, employ and integrate spatial resources semi-automatically in SIG, we pro...