修订了光谱优化方法,以去除表面反射的辐射,以估计远程传感反射率从水面方法
Optics express
|July 21, 2023
概括
一个新的波长依赖的海面天窗反射率模型改善了在水面上测量出水的辐射. 这种光谱优化方法提高了远程传感反射率数据的质量,在各种水类型和条件下.
科学领域:
- 海洋光学 海洋光学
- 遥感是一种远程传感.
- 辐射转移理论 辐射转移理论
背景情况:
- 精确测量水离开辐射 (Lw) 对于海洋色彩遥感至关重要.
- 水面接近 (AWA) 被广泛使用,但需要对表面反射的天窗进行校正.
- 现有的纠正表面反射率的方法通常假定光谱独立,这是不准确的.
研究的目的:
- 开发和验证波长依赖的模型,用于有效的海面天窗反射率 (ρ).
- 通过结合光谱优化来改进使用AWA的遥感反射率 (Rrs) 的确定.
- 提高水面现场测量的质量和可用性,用于遥感应用.
主要方法:
- 开发了一个新的波长依赖的模型,用于海面天窗反射率 (ρ).
- 应用了一种光谱优化方法,用新的 ρ 模型从 AWA 测量中确定 Rrs.
- 在包括高波在内的各种条件下,验证了AWA衍生的Rrs与天窗阻塞方法 (SBA) 相比.
主要成果:
- 新的 ρ 模型显著提高了从 AWA 获得的 Rrs 的准确性.
- 在AWA衍生和SBA获得的Rrs (R2>0.92,MAD <11%) 之间达成了良好的协议.
- 该方法在各种水类和观测几何形状中表现出强度.
结论:
- 使用波长依赖的 ρ 模型开发的光谱优化方法在 AWA 测量中有效地纠正了表面反射的辐射.
- 这种方法提高了水面现场Rrs数据的质量和可用性,用于算法开发和卫星产品验证.
- 这种方法比传统方法有了显著的改进,特别是在高浪等具有挑战性的条件下.
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