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

Figure 4

Bar chart of the model parameters (VIPs). (a) NDSI-Ebinur Lake Basin. (b) RSI-Ebinur Lake Basin. (c) NDSI-Ugan-Kuqa Oasis. (d) RSI-Ugan-Kuqa Oasis. (e) NDSI-Keriya Oasis. (f) RSI-Keriya Oasis.

(a)

(b)

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(e)

(f)