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

Figure 4

(a) Result calculation of the AWEI approach for (a) scene image and (b) split scene image with GIF at the size of 2 km × 2 km; a total of 1677 split scene images were used in the study to calculate the local statistics parameters for each split scene image. (c) Measurement results of the coefficient of variation value of each split scene image plotted on the X-axis and the scene ratio value plotted on the Y-axis.

(a)

(b)

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