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Status of MODIS Spatial and Spectral Characterization and Performance

TitleStatus of MODIS Spatial and Spectral Characterization and Performance
Publication TypePresentation
Year of Publication2016
AuthorsLink, D., Z. Wang, and X. Xiong
ProceedingsProc. of SPIE Earth Observing Missions and Sensors: Development, Implementation, and Characterization IV
MCST ConferenceProc. of SPIE Earth Observing Missions and Sensors: Development, Implementation, and Characterization IV
Volume9881
Abstract

Since launch, both Terra and Aqua MODIS instruments have continued to operate and make measurements of
the earth’s top of atmospheric (TOA) radiances and reflectance. MODIS collects data in 36 spectral bands
covering wavelengths from 0.41 to 14.4 m. These spectral bands and detectors are located on four focal plane
assemblies (FPAs). MODIS on-board calibrators (OBC) include a spectro-radiometric calibration assembly
(SRCA), which was designed to characterize and monitor sensor spatial and spectral performance, such as on-
orbit changes in the band-to-band registration (BBR), modulation transfer function (MTF), spectral band center
wavelengths (CW) and bandwidths (BW). In this paper, we provide a status update of MODIS spatial and
spectral characterization and performance, following a brief description of SRCA functions and on-orbit
calibration activities. Sensor spatial and spectral performance parameters derived from SRCA measurements
are introduced and discussed. Results show that on-orbit spatial performance has been very stable for both Terra
and Aqua MODIS instruments. The large BBR shifts in Aqua MODIS, an issue identified pre-launch, have
remained the same over its entire mission. On-orbit changes in CW and BW are less than 0.5 nm and 1 nm,
respectively, for most VIS/NIR spectral bands of both instruments.

DOI10.1117/12.2224307