. Regional-Scale Mapping
1) Regional-scale modeling: Models obtained from any pilot site cannot be directly applied to regional-scale salinity mapping due to lack of spatial representativeness. That is why we proposed here a “multiscale modeling” approach to upscale plot-level measurements and high-resolution-derived models to regional-scale assessment. To do so, the data from different pilot sites, which are situated in different locations in Mesopotamia (Fig. 2), were integrated together for regional-scale modeling using the same multiple regression model.