Flowchart for SW mapping using the time-series NDWFI.
Newswise — Surface water (SW) is crucial for life, ecosystems, and human activities, serving many functions from climate regulation to supporting biodiversity and agriculture. It's highly dynamic, influenced by climate change, land use alterations, and human interventions like dam construction, making its monitoring essential for effective management and conservation. Traditional methods for water detection face limitations, often missing small or seasonal bodies. Advances in remote sensing offer new techniques for detailed, large-scale water mapping, emphasizing the need for high spatial and temporal resolution to capture SW's complex dynamics and support sustainable management efforts.
Sun Yat-Sen University researchers developed the Normalized Difference Water Fraction Index (NDWFI) using Landsat and Spectral Mixture Analysis on Google Earth Engine, a leap in hydrology. This method enhances tracking of water bodies, improving water security against extreme events. The article (doi: 10.34133/remotesensing.0117) published in the Journal of Remote Sensing on February 21, 2024, it signifies progress in water management by integrating remote sensing and environmental science.
In this study, researchers developed the NDWFI by utilizing Landsat imagery and Spectral Mixture Analysis (SMA) within the Google Earth Engine framework. The technique was meticulously tested across varied terrains, exhibiting a remarkable 98.2% accuracy rate in identifying water bodies, a significant improvement over traditional water detection methods. The use of over 11,000 Landsat images facilitated the creation of detailed surface water maps for Jiangsu Province, China, showcasing NDWFI's ability to discern even the smallest and most transient water features. This method's enhanced precision in capturing the intricacies of water body dynamics marks a crucial advancement in the field of hydrological monitoring, setting a new standard for water resource management and conservation efforts worldwide.
Professor Qian Shi, a lead author of the study, stated, "Our approach using NDWFI significantly improves the accuracy of water detection, especially for small and transient water bodies, which are often overlooked by traditional methods. This advancement opens new avenues for comprehensive hydrological studies and water management strategies."
The NDWFI method presents a significant leap forward in environmental monitoring, offering a more accurate and detailed understanding of SW dynamics. This methodology enhances water security, supports sustainable development, and aids in the adaptation to climate change by providing reliable data for water resource management and policy-making.
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References
DOI
Original Source URL
https://doi.org/10.34133/remotesensing.0117
Funding information
This work is granted by the National Science Foundation for Distinguished Young Scholars of China under grant 42225107; in part by the National Key Research and Development Program under grant 2022YFB3903402; and in part by the National Natural Science Foundation of China under grants 61976234, 42171409, and 42171410.
About Journal of Remote Sensing
The Journal of Remote Sensing, an online-only Open Access journal published in association with AIR-CAS, promotes the theory, science, and technology of remote sensing, as well as interdisciplinary research within earth and information science.
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