Table 7 Factor screening for modeling heavy metal element concentrations.

From: Remote sensing inversion on heavy metal content in salinized soil of Yellow River Delta based on Random Forest Regression—a case study of Gudao Town

Cr

Modeling factors

Green

MNDWI

DVI

CRM

Aspect

Iron-stained alteration

As

Green

Blue

MNDWI

MSAVI

Aspect

–OH, CO32− alteration

Cu

Green

EVI

MNDWI

NDVI

Aspect

Iron-stained alteration

Mn

Green

MNDWI

DVI

RVI

Aspect

Iron-stained alteration

Ni

SWIR2

Blue

MNDWI

EVI

Aspect

–OH, CO32− alteration

Pb

SWIR2

EVI

RGRI

RVI

Slope

Iron-stained alteration

Zn

Green

MNDWI

MSAVI

CRM

Aspect

Iron-stained alteration

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