In the present study, a novel water index has been proposed for mapping of open surface water in multispectral images and named as open surface water index (OSWI). The proposed index has been applied on Landsat-8 data to delineate the water area and the results are compared with those of existing water indices. The index is also applied on Sentinel-2A data and corresponding water pixels are extracted. The results have been validated with the help of classification as well as density slicing based methods on multisensory data. The preliminary results show that the proposed index is capable of identifying smaller water regions which remain unidentified by other indices.

在本研究中，已提出了一种新的水指数，用于在多光谱图像中映射开放表面水，并将其称为开放表面水指数（OSWI）。拟议的指标已在Landsat-8数据上用于描述水域，并将结果与​​现有水指标进行了比较。该索引也应用于Sentinel-2A数据，并提取相应的水像素。结果已在多感官数据的分类以及基于密度切片的方法的帮助下得到了验证。初步结果表明，所提出的指数能够识别较小的水域，而其他指数仍无法识别。