Table 2 Spearman’s rank correlation coefficient between vertical subsidence rates and NDRBI variations in the areas most prone to land subsidence in Zhengzhou city.

From: Identifying spatiotemporal pattern and trend prediction of land subsidence in Zhengzhou combining MT-InSAR, XGBoost and hydrogeological analysis

Category

Subsidence rate (mm/year)

\(\Delta NDRBI\) range (value)

Raster count

Proportion of \(\Delta NDRBI>0.4\)

1

− 28 ~ − 12

− 0.28066 ~ 0.98441

352

63%

2

− 11 ~ − 7

− 0.53499 ~ 0.92394

2750

25%

3

− 6 ~ − 4

− 0.71731 ~ 0.91702

11,514

6%

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