Proceedings MDPI’s Post

📰 Extraction of Surface Water Extent: Automated Thresholding Approaches ✍ Meghaa Sathish Kumar Inland water bodies play a crucial role in both ecological and sociological contexts. The distribution of these water bodies can change over time due to natural or human-induced factors. Monitoring the extent of surface water is vital to understand extreme events such as floods and droughts. The availability of dense temporal Earth observation data from sensors like Landsat and Sentinel, coupled with advancements in cloud computing, has enabled the analysis of surface water extent over extended periods. In this study, automated thresholding approaches were applied within the Google Earth Engine platform to extract the surface water extent of the Chembarampakkam reservoir in Tamil Nadu, India. Sentinel-2 data spanning from 2019 to 2023 were used to derive two key indices, namely, the Normalized Difference Vegetation Index (NDVI) and the Normalized Difference Water Index (NDWI). These indices were then thresholded to determine the presence of water. The performance of two different global thresholding techniques, namely, the deterministic thresholding and Otsu thresholding methods, was compared to achieve better results. To enhance the accuracy of the deterministic technique, an iterative method was implemented. While the threshold values were generally similar for both techniques, the Otsu algorithm slightly outperformed the iterated deterministic technique in water classification. Furthermore, a surface water dynamics image was obtained using temporal images, providing insights into the temporal surface dynamism of the reservoir. Overall, this study highlights the significance of surface water monitoring using remote sensing and cloud computing techniques. 🔗 Read the paper online: https://lnkd.in/gSgPzhsA. #thresholding #determinant #iteration #surfacewater

Extraction of Surface Water Extent: Automated Thresholding Approaches

Extraction of Surface Water Extent: Automated Thresholding Approaches

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