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5 October 2007 MODIS pre-launch reflective solar band response vs. scan angle
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Abstract
The MODIS scan mirror reflectance is a function of angle of incidence (AOI). For the MODIS solar reflective bands (RSB), it is specified that the calibrated response variation versus scan angle (RVS) should be less than 2% and the uncertainty of the RVS characterization should be less than 0.5% within the scan angle range of -45° ~ +45°. During MODIS pre-launch RVS calibration and characterization, a series of laboratory tests were performed to assess the relative response versus scans angle for all MODIS bands. Utilizing a Spherical Integrating Source, SIS, as an illumination source, the test data was collected at various angles of incidence. The characterization of the RVS included a measurement uncertainty assessment, repeatability analysis, RVS modeling and determination. The results show good repeatability on the order of less than 0.5% for all the near infrared (NIR) bands and the visible (VIS) bands. The detector response variation across scan angles for the majority of the NIR and VIS bands meets the instrument specification. The derived RVS model enabled appropriate implementation of on orbit calibration. This paper summarizes the methodologies and the algorithms used in the MODIS pre-launch RVS calibration for the RSB bands, illustrates detector response variation with scan mirror angle of incidence, and demonstrates instrument specification compliance within the scan angle coverage of ±55 degree. As a result, the RVS model and the correction coefficients developed in the pre-launch calibration have been adopted during the MODIS on-orbit calibration.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Chunhui Pan, Jack Xiong, and Nianzeng Che "MODIS pre-launch reflective solar band response vs. scan angle", Proc. SPIE 6677, Earth Observing Systems XII, 66770R (5 October 2007); https://doi.org/10.1117/12.730573
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