一个双值算法用于冰覆盖湖泊水位采集使用哨兵-3SAR高度波形
Fucai Tang1, Peng Chen1,2, Zhiyuan An3
1College of Geomatics, Xi'an University of Science and Technology, Xi'an 710054, China.
Sensors (Basel, Switzerland)
|December 23, 2023
概括
一个新的双值算法准确地使用Sentinel-3A卫星测高度仪测量覆盖冰面湖泊的水位. 这种方法显著提高了在中高度的冬季湖泊监测的精度.
科学领域:
- 地球观测 地球观测
- 水文学的水文学
- 遥感 遥感 遥感 遥感
背景情况:
- 卫星高度测量,特别是Sentinel-3A的SRAL,提供了精确的内陆水位测量.
- 在中高度的湖泊上的冰盖使得由于高度计足迹不均,难以准确估计水位.
- 标准SAR波形回收算法与冰覆盖的湖泊作斗争,导致异常读数.
研究的目的:
- 开发和验证一种新的双值算法,用于精确测量冰盖湖泊的水位.
- 改进内部水体的表面类型分类,使用反向散射系数和亮度温度.
- 为了提高Sentinel-3A SRAL数据的准确性,用于冬季湖泊监测.
主要方法:
- 通过分析反射散射系数和亮度温度,开发了一种经过修改的方法来分类湖面类型,并通过地面观测进行验证.
- 引入了一种双值算法,用于识别高度计波形中的多个峰值,而不需要高度校正,克服了以前方法的局限性.
- 从九个北美冰覆盖湖泊 (2016-2019) 的水位数据被检索并使用双值算法和SAMOSA-3算法与现场数据进行比较.
主要成果:
- 双值算法在冰覆盖湖泊的SAMOSA-3算法相比,显示出明显更高的精度.
- 双值算法的根平均平方误差 (RMSE) 在研究的湖泊中显著较低,与SAMOSA-3相比减少了高达87%.
- 新的算法在埃里湖中实现了低至5.01厘米的RMSE,展示了其有效性.
结论:
- 双值算法在冬季条件下准确估计冰盖湖泊的水位.
- 该方法为中高度湖泊的长期,连续和高精度水位监测提供了一个有希望的方法.
- 这些发现有助于在季节性结地区更好地了解和管理淡水资源.
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