概括
基于卫星的光检测和测距 (LiDAR) 现在可以测量全球表面反射率. 本研究详细介绍了Goumang卫星LiDAR实现这一目标的方法,使得基于反射率更好地分离表面目标.
科学领域:
- 地球观测 地球观测
- 遥感 遥感 遥感 遥感
- 地质物理学 地质物理学
背景情况:
- 基于卫星的光探测和测距 (LiDAR) 对于全球高度测量至关重要.
- 激光雷达的活跃传感能力允许获取全球表面反射率数据.
- 表面反射性能是区分各种表面目标的关键.
研究的目的:
- 研究使用LiDAR在地球生态系统碳库存卫星 (Goumang) 上获取表面反射率的方法.
- 开发和验证辐射模型和放射学校准方法,以准确检索表面反射率.
- 通过使用卫星LiDAR数据,建立一个检索全球表面反射率的途径.
主要方法:
- 基于激光的传输路径构建了一个辐射模型,用于LiDAR表面反射率检索.
- 设计并实施了一种获得放射性校准系数的方法,使用的是来自湖放射性校准站点的数据.
- 引入了整合来自其他卫星的全球气溶产品的检索方法,用于全球表面反射率估计.
主要成果:
- 放射测量校准不确定性估计约为5%.
- 使用Goumang LiDAR的全球表面反射率检索显示,与地面测量值相比,相对偏差约为10%.
- 开发的方法证明了大规模表面反射率绘制的可行性.
结论:
- 该研究提出了一种可行的方法,用于利用基于卫星的LiDAR检索全球表面反射率.
- 精确的放射测量校准对于可靠的表面反射度测量至关重要.
- 这项研究有助于推进地面表征的地球观测能力.
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