3.1. Salinity prediction model using salinity index
The model of ECe vs SI offered coefficient of determination at 78% (Fig. 4). This model directly gives the salinity level at any point in the image. From the predicted salinity map, three ranges of salinity level were generated (Fig. 5). The summary of salinity level, extent of the area in hectare and percentage are given in Table 3. The three salinity classes with varying degree of salinity were, moderately saline and slightly saline and non-saline, which covers 18.8%, 23.4% and 57.7% of the total area, respectively.
equation(1)
Salinity=-0.705575+7.5189111×X
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