Early validation of the Multi-angle Imaging SpectroRadiometer (MISR) radiometric scale

The Multi-angle Imaging SpectroRadiometer (MISR) instrument consists of nine cameras, four spectral bands each, and an on-board calibrator (OBC). Experiments using the latter allow camera radiometric coefficients to be updated bimonthly. Data products are thus calibrated to a stable radiometric scal...

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Bibliographic Details
Published in:IEEE transactions on geoscience and remote sensing 2002-07, Vol.40 (7), p.1477-1492
Main Authors: Bruegge, C.J., Chrien, N.L., Ando, R.R., Diner, D.J., Abdou, W.A., Helmlinger, M.C., Pilorz, S.H., Thome, K.J.
Format: Article
Language:English
Subjects:
Calibration
Cameras
Consistency
Earth Observing System
Imaging
Instruments
Laboratories
Propulsion
Radiance
Radiometry
Space technology
Space vehicles
Spectral bands
Spectroradiometers
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Summary:The Multi-angle Imaging SpectroRadiometer (MISR) instrument consists of nine cameras, four spectral bands each, and an on-board calibrator (OBC). Experiments using the latter allow camera radiometric coefficients to be updated bimonthly. Data products are thus calibrated to a stable radiometric scale, even in the presence of instrument response changes. The camera, band, and pixel-relative calibrations are accurately determined using the OBC. Conversely, as the OBC itself is subject to response degradation, MISR also conducts annual field vicarious calibration campaigns. The first of these, conducted in June 2000 at a desert site in Nevada, has been used to establish the present absolute radiometric scale. Validation of this radiometric scale, using AirMISR, shows consistency to within 4%. Following these studies, however, it was determined that MISR radiometry is subject to scene-dependent effects due to ghosting that, for the Nevada test sites, reduces the apparent radiance by 3%. Correction for this effect is required in order to avoid radiometric errors over sites that do not exhibit the same background contrast. Additional studies are in progress, with plans to correct for scene-contrast effects in future Level 1B1 processing.
ISSN:0196-2892
1558-0644
DOI:10.1109/TGRS.2002.801583