The Scientific World Journal

Research Article

Evaluation of the Threshold for an Improved Surface Water Extraction Index Using Optical Remote Sensing Data

Table 2

AWEI threshold improvements are based on the mean value calculation of the local threshold of the second-stage split scene image selection for surface water detection.
Approach class threshold calculationAWEI equationThreshold improvement value
Equal interval4 x (G-MIR) − (0.25 x NIR + 2.75 x SWIR)≥−0.676
Quantile4 x (G-MIR) − (0.25 x NIR + 2.75 x SWIR)≥−0.089
Geometrical interval4 x (G-MIR) − (0.25 x NIR + 2.75 x SWIR)≥−0.084
Natural break4 x (G-MIR) − (0.25 x NIR + 2.75 x SWIR)≥−0.232