Augmented Normalized Difference Water Index for improved surface water monitoring

We present a comprehensive critical review of well-established satellite remote sensing water indices and offer a novel, robust Augmented Normalized Difference Water Index (ANDWI). ANDWI employs an expanded set of spectral bands, RGB, NIR, and SWIR1-2, to maximize the contrast between water and non-water pixels. Further, we implement a dynamic thresholding method, the Otsu algorithm, to enhance ANDWI?s performance. Applied to a variety of environmental conditions, ANDWI with Otsu-thresholding offered the highest overall accuracy (accuracy = 0.98, F1 = 0.98, and Kappa = 0.96) compared to other indices (NDWI, MNDWI, AWEI, WI). We also propose a novel cloud filtering algorithm that substantially increases the number of useable images compared to the conventional cloud-free composites (124% increased observations in the studied area) and resolves inappropriate masking of water bodies and hot sands as clouds by conventional methods. Finally, we develop a Google Earth Engine App to readily delineate 16-day surface water bodies across the globe.

Automated summary

This study provides a critical review of satellite remote sensing water indices and introduces a novel Augmented Normalized Difference Water Index (ANDWI) that utilizes an expanded set of spectral bands and dynamic thresholding. The ANDWI with Otsu-thresholding outperformed other indices in terms of overall accuracy. Additionally, a new cloud filtering algorithm and a Google Earth Engine App were developed to improve the accuracy and efficiency of water body delineation.