本文以棉花和大豆为例,基于车载多频率微波辐射计的观测数据,利用最小二乘原理实现对两种典型农作物等效散射反照率的估算,研究了植被层等效散射反照率随观测角度、频率以及植被浓密程度的变化规律,对不同覆盖度情况下植被层的等效散射反照率进行了定性的分析。这一研究结果在以零阶模型为基础进行地表参数反演时,对于植被层等效散射反照率的确定具有重要的理论参考价值。

In many studies about land surface parameters inversion using the zeroth order model, the equivalent scattering albedo are usually set to a small value (0.05—0.1) or to zero, which lacks of experimental data support. In this study, the equivalent scattering albedo for cotton and soybean in different growing stages are estimated based on the observations from the Truck-mounted Multi-frequency Microwave Radiometer using the least squares technique. Further investigations are also made to investigate the variation of equivalent scattering albedo versus frequency, observation angle and the crop phenology. The result can provide some theoretical reference for determining the equivalent scattering albedo of vegetation using the zeroth order model to inverse land surface parameters.