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Open AccessArticle

Evaluating the Performance of Sentinel-1A and Sentinel-2 in Small Waterbody Mapping over Urban and Mountainous Regions

by 1,2, 1,3,*, 2 and 2
1
Key Laboratory of Agricultural Big Data, Ministry of Agriculture and Rural Affairs, Beijing 100081, China
2
Key Lab of Guangdong for Utilization of Remote Sensing and Geographical Information System, Guangdong Open Laboratory of Geospatial Information Technology and Application, Research Center of Guangdong Province for Engineering Technology Application of Remote Sensing Big Data, Guangzhou Institute of Geography, Guangdong Academy of Sciences, Guangzhou 510070, China
3
Agricultural Information Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
*
Author to whom correspondence should be addressed.
Academic Editor: Domenico Cicchella
Water 2021, 13(7), 945; https://doi.org/10.3390/w13070945
Received: 28 January 2021 / Revised: 16 March 2021 / Accepted: 25 March 2021 / Published: 30 March 2021
(This article belongs to the Section Hydrology and Hydrogeology)
Accurate waterbody mapping can support water-related environment monitoring and resource management. The Sentinel series satellites provide high-quality Synthetic Aperture Radar (SAR) and optical observations that are commonly used in waterbody mapping. However, owing to the 10-m spatial resolution of Sentinel data, previous studies mostly focused on the mapping of large waterbodies. In this work, we evaluated the performance of small waterbody mapping over urban and mountainous regions with two datasets, the average annual VH backscatter coefficients (VHavg), derived from the Sentinel-1A series, and the Modified Normalized Difference Water Index (MNDWI), derived from cloud-free Sentinel-2. A proven framework of waterbody mapping based on watershed segmentation and noise reduction was employed to assess the performance of the two datasets in waterbody identification. The validation was performed by comparing their results with 1-m spatial resolution reference waterbody data. Assessment metrics, including Precision, Recall, and F-measure, were employed. Results showed that: (1) the MNDWI outperformed the VHavg by 9 percentage points of the F-measure; (2) there was more room for results of VHavg to improve the accuracy through a combination with noise reduction; and (3) the potential smallest identifiable waterbody area (recall rate larger than 0.8) was larger than 104 m2. View Full-Text
Keywords: Guangzhou; MNDWI; Sentinel-1A; Sentinel-2; waterbody; watershed segmentation; small waterbody Guangzhou; MNDWI; Sentinel-1A; Sentinel-2; waterbody; watershed segmentation; small waterbody
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MDPI and ACS Style

Jiang, H.; Wang, M.; Hu, H.; Xu, J. Evaluating the Performance of Sentinel-1A and Sentinel-2 in Small Waterbody Mapping over Urban and Mountainous Regions. Water 2021, 13, 945. https://doi.org/10.3390/w13070945

AMA Style

Jiang H, Wang M, Hu H, Xu J. Evaluating the Performance of Sentinel-1A and Sentinel-2 in Small Waterbody Mapping over Urban and Mountainous Regions. Water. 2021; 13(7):945. https://doi.org/10.3390/w13070945

Chicago/Turabian Style

Jiang, Hao; Wang, Mo; Hu, Hongda; Xu, Jianhui. 2021. "Evaluating the Performance of Sentinel-1A and Sentinel-2 in Small Waterbody Mapping over Urban and Mountainous Regions" Water 13, no. 7: 945. https://doi.org/10.3390/w13070945

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