研究目的
To provide a method for robust delineation of pothole water extent, addressing the difficulties of SAR-based inundation extent monitoring in wetlands, and to analyze surface water dynamics in the context of hydrological connectivity within the Prairie Pothole Region.
研究成果
Sentinel-1 time series can be used to map pothole water extent dynamics in the Pipestem Creek catchment during late spring, summer and autumn. Snow cover can be a significant source of error during early spring. Future work will include mapping of flooded vegetation.
研究不足
Confusion with wet snow may take place in early spring, and cloud cover during snow melt is frequent, impeding further analysis of the problem.
1：Experimental Design and Method Selection:
The study used Sentinel-1 SAR data to map inundation dynamics in the Prairie Pothole Region. A clustering approach was first used to delineate permanent water bodies, followed by region growing and automatic thresholding to map water body dynamics.
2：Sample Selection and Data Sources:
The study area was the Pipestem Creek catchment in North Dakota, USA. Sentinel-1 Interferometric Wide Swath (IWS) scenes acquired between March 2015 and October 2017 were used.
3：List of Experimental Equipment and Materials:
Sentinel-1 SAR data, digital terrain model (DTM) derived from LiDAR data, and Planetscope constellation optical image.
4：Experimental Procedures and Operational Workflow:
SAR data processing included applying a Gamma MAP filter, calibration, geocoding, and conversion to dB. Water extent retrieval involved harmonic modeling and k-medoids cluster analysis.
5：Data Analysis Methods:
The study compared water extents derived from Sentinel-1 and Planetscope, and assessed the influence of snow on radar backscatter.
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