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Evaluating crosstalk-induced radiometric deviations in Terra MODIS Band 29, 31, and 32
Author(s): Mike Chu
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Paper Abstract

The radiometric stability of selected thermal emissive bands (TEBs) of Terra and Aqua MODIS is evaluated via a direct intersensor comparison with SNPP VIIRS. The analysis adapts a “nadir-only” refinement of the simultaneous nadir overpasses (SNOs) analysis to evaluate radiometric deviations in MODIS Collection 6.0 and 6.1 data releases, the latter having been implemented with a version of crosstalk effect mitigation for Terra MODIS Bands 27−30. The comparison time series shows radiometric deviation in Terra MODIS Band 29 (8.55 mm) up to 6%, or 3 K in brightness temperature (BT), in Collection 6.0, and -1.5%, or -0.7 K in BT, in Collection 6.1. In particular, the safe mode event of February 2016 has significantly worsened the effect. This study includes the inter-TEB comparisons of MODIS bands B31 and B32 with SNPP VIIRS, and also describes a procedure using both radiance-to-radiance comparison and BTdifference time series to estimate the BT-difference uncertainty specifications as well as the radiance-to-radiance time series baselines. The Terra MODIS Band 29 result highlights the continual impact of crosstalk effect on numerous TEBs of MODIS Collection 6.1 that is not fully mitigated, which can further impact cloud masks, sea surface temperatures and other product retrievals.

Paper Details

Date Published: 9 September 2019
PDF: 8 pages
Proc. SPIE 11127, Earth Observing Systems XXIV, 111271E (9 September 2019); doi: 10.1117/12.2529559
Show Author Affiliations
Mike Chu, Colorado State Univ. (United States)


Published in SPIE Proceedings Vol. 11127:
Earth Observing Systems XXIV
James J. Butler; Xiaoxiong (Jack) Xiong; Xingfa Gu, Editor(s)

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