解决方案对印度息的三角洲洪水平原的牛弓湖绘图和洪水一致性分析的影响
1Department of Geography, University of Gour Banga, Malda, India.
Environmental science and pollution research international
|August 3, 2023
概括
哨兵卫星和陆地卫星的图像显示,用于绘制牛弓湖和洪水频率的精度差异很小. 精细分辨率的哨兵图像提供了轻微的优势,但当哨兵数据稀缺时,Landsat是一个可行的替代方案.
科学领域:
- 遥感 遥感 遥感 遥感
- 环境科学 环境科学
- 水文学的水文学
背景情况:
- 以前的研究表明,更精细的空间分辨率可以改善湿地地图.
- 哨兵与陆卫星图像的有效性,用于划定特定特征,如牛弓湖和绘制洪水频率的图像,仍在调查中.
研究的目的:
- 为了比较Sentinel和Landsat图像的有效性,用于绘制牛弓湖和洪水频率的地图.
- 评估各种光谱指数和水存在频率 (WPF) 方法的表现,用于湿地特征.
主要方法:
- 使用的光谱指数:规范差异水指数 (NDWI),修改的NDWI (MNDWI),重新修改的NDWI (RmNDWI) 和整体植被包括集成水指数 (ViAWI).
- 采用水存在频率 (WPF) 方法来评估洪水的一致性.
- 应用精度矩阵来验证空间分辨率差异的影响.
主要成果:
- 经过修改的NDWI (MNDWI) 有效地绘制了牛弓湖,但在植被区域方面遇到了困难; ViAWI合奏解决了这一局限性.
- 洪水频率分析显示,大约70%的地区呈现着持续的水存在,这表明水生态和经济可行性.
- 哨兵图像在绘制牛弓湖和洪水频率方面提供了轻微的优势,尽管与Landsat图像的精度差异很小.
结论:
- 集团ViAWI有效地绘制了植被牛弓湖和洪水频率的地图.
- 虽然哨兵图像提供了边际的好处,但陆地卫星图像是绘制水体与水存在一致的合适的替代方案,特别是当哨兵数据有限时.
- 在Sentinel和Landsat之间进行洪水映射的选择可能取决于数据的可用性和水体的特定特征.
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