On-orbit performance of the MODIS reflective solar bands
time-dependent response versus scan angle algorithm

J. Sun; X. Xiong; A. Angal; H. Chen; Xu Geng; A. Wu

doi:10.1117/12.930021

15 October 2012 On-orbit performance of the MODIS reflective solar bands time-dependent response versus scan angle algorithm

J. Sun, X. Xiong, A. Angal, H. Chen, Xu Geng, A. Wu

Author Affiliations +

Proceedings Volume 8510, Earth Observing Systems XVII; 85100J (2012) https://doi.org/10.1117/12.930021
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

Abstract

Time-dependent Response versus Scan angle (RVS) is vital for MODIS Reflective Solar Bands (RSB) on-orbit calibration. Time-dependent RVS Look-Up Tables (LUT) have been applied to MODIS Level 1B (L1B) since Collection 4. Various approaches have been developed to derive the time-dependent RVS LUT for MODIS RSB. The Collection 4 time-dependent RVS was developed based on the response from the on-board calibrators. In Collection 5, the RVS is derived using the on-board calibrators with additional input of mirror side differences from invariant ocean targets. The Collection 5 methodology is carried over in Collection 6 for most RSB with the exception of Terra MODIS bands 1-4, and 8-9 and Aqua MODIS bands 8-9, where response trending from pseudo-invariant desert targets is used in addition to the measurements from the on-board calibrators. For these bands, the SD/SDSM calibration may not provide accurate gains and/or the linear approximation for the AOI dependence may not be adequate. As a result, earth scene response trending is used in Collection 6 for the derivation of the RVS for the aforementioned bands. In this report, we review all the methodologies used to derive the on-orbit RVS and the performance of the derived timedependent RVS.

Citation Download Citation

J. Sun, X. Xiong, A. Angal, H. Chen, Xu Geng, and A. Wu "On-orbit performance of the MODIS reflective solar bands time-dependent response versus scan angle algorithm", Proc. SPIE 8510, Earth Observing Systems XVII, 85100J (15 October 2012); https://doi.org/10.1117/12.930021

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