Evaluation of early warning signals for soil erosion using remote sensing indices in northeastern Iran.

An increasing trend in NDSI suggests rising soil salinity in eroded areas, which may further exacerbate erosion risk.

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For the NDSI time series, an increasing trend was observed in the autocorrelation coefficient and standard deviation, while skewness exhibited a decreasing trend, with Kendall’s tau values of 0.71, 0.42, and 0.58, respectively.

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Similarly, the TGSI time series demonstrated a positive trend in the autocorrelation coefficient and a negative trend in both standard deviation and skewness, with Kendall’s tau values of 0.43, 0.27, and 0.35, respectively.

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