Methods of Earth View Based Calibration of the Response Versus Scan Angle of the MODIS Reflective Solar Bands

Twedt, Kevin A ; Chen, Hongda ; Xiong, Xiaoxiong ; Angal, Amit A ; Geng, Xu ; Wu, Aisheng

关键词: AQUA SPACECRAFT;    CALIBRATING;    DESERTS;    IMAGING SPECTROMETERS;    MIRRORS;    MODIS (RADIOMETRY);    RADIOMETERS;    SOLAR INSTRUMENTS;    TERRA SPACECRAFT;    REFLECTANCE;   

RP-ID  :  GSFC-E-DAA-TN67296

学科分类：地球科学(综合)

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

The MODIS instruments on the Terra and Aqua spacecraft are cross-track scanning radiometers that view the Earth scene, a space view port, and the on-board calibrators using a two-sided scan mirror. The reflectivity of the scan mirror varies with the angle of the incident light, and changes in this response versus scan angle (RVS) need to be tracked on orbit in order to maintain accurate calibration. In this paper, we review various methods of RVS calibration of the reflective solar bands using pseudo-invariant desert targets and discuss potential advantages and disadvantages for use in future calibration.