Comparison between a Machine-Learning-Based Method and a Water-Index-Based Method for Shoreline Mapping Using a High-Resolution Satellite Image Acquired in Hwado Island, South Korea

Figure 13

Detailed examination of comparison results: (a) locations of the selected Regions 1, 2, 3, and 4 in the entire study area; (b) Region 1, where both shorelines had high accuracy; (c) Region 2, where the second shoreline had better accuracy for the first reason; (d) Region 3, where the second shoreline had better accuracy for the second reason; and (e) Region 4, where both shorelines had low accuracy due to the shaded areas that were not identified in the NDWI image or the coastal-surface classification map.

(a)

(b)

(c)

(d)

(e)