“…The determined accuracy of 8.4 m lies in the sub-pixel range of Landsat sensors. The validation area, however, only covers an area in central Vietnam that consists of urban areas, rocky coasts, sandy beaches, estuaries, and vegetated coast and shows a low tidal range [77]. Thus, while the validation area contains some heterogeneity in coastal types, it does not provide an indication of accuracy in mangrove areas, marshlands, or tidal flats of southern and northern Vietnam.…”