Estimating Salt Concentrations Based on Optimized Spectral Indices in Soils with Regional Heterogeneity

Figure 3

Two-dimensional maps of the correlation between optimized spectral indices and SSC. (a) NDSIs (Ebinur Lake Basin). (b) RSIs (Ebinur Lake Basin). (c) NDSIs (Ugan-Kuqa Oasis). (d) RSIs (Ugan-Kuqa Oasis). (e) NDSIs (Keriya Oasis). (f) RSIs (Keriya Oasis). (g) NDSIs (All data). (h) RSIs (All data).

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