Error Analysis of Retrieved Aerosol Optical Depth and Surface Reflectance due to the Azimuthal Angle Simplification of Atmospheric Functions

因大氣函數方位角簡化所致反演氣溶膠光學厚度和地面反射率之誤差分析

劉建慧(Chien-Hui Liu)

《Terrestrial, Atmospheric and Oceanic Sciences》 15卷1期 (2004/03) Pp. 89-96

並列摘要

Using a simplified azimuthal angle assumption of atmospheric functions in the atmospheric correction model, such as ATmospheric CORrection model version 2 (ATCOR2) and ATmospheric CORrection model version 3 (ATCOR3) developed by Richter (1997) for Systeme Pour l’Observation de la Terre (SPOT) High Resolution Visible (HRV) data, can generate errors. This paper discusses the errors of retrieved surface reflectance and aerosol optical depth (AOD) due to such simplification. The results indicate that the relative error of retrieved surface reflectance can exceed 40% in the forward-scattering direction in hazy sky and that of retrieved AOD can be over 10% in the anti-solar direction in clear sky at the extreme view angle. Hence, the consideration of azimuthal angle dependence of atmospheric functions is indispensable for the atmospheric correction model of SPOT HRV data, particularly in large view angles, e.g., larger than -21.5° (backward-scattering region) and 24.9° (forward-scattering region) in clear sky, and larger than -19.1° and 12.9° in hazy sky.

並列關鍵字

Aerosol optical depth ； Surface reflectance ； SPOT