NDLI: Vicarious calibration of ASTER thermal infrared bands

Content Provider	IEEE Xplore Digital Library
Author	Tonooka, H. Palluconi, F.D. Hook, S.J. Matsunaga, T.
Copyright Year	1980
Abstract	The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) on the Terra satellite has five bands in the thermal infrared (TIR) spectral region between 8-12 /spl mu/m. The TIR bands have been regularly validated in-flight using ground validation targets. Validation results are presented from 79 experiments conducted under clear sky conditions. Validation involved predicting the at-sensor radiance for each band using a radiative transfer model, driven by surface and atmospheric measurements from each experiment, and then comparing the predicted radiance with the ASTER measured radiance. The results indicate the average difference between the predicted and the ASTER measured radiances was no more than 0.5% or 0.4 K in any TIR band, demonstrating that the TIR bands have exceeded the preflight design accuracy of <1 K for an at-sensor brightness temperature range of 270-340 K. The predicted and the ASTER measured radiances were then used to assess how well the onboard calibration accounted for any changes in both the instrument gain and offset over time. The results indicate that the gain and offset were correctly determined using the onboard blackbody, and indicate a responsivity decline over the first 1400 days of the Terra mission.
Sponsorship	IEEE Geoscience and Remote Sensing Society IEEE URSI
Starting Page	2733
Ending Page	2746
Page Count	14
File Size	1399255
File Format	PDF
ISSN	01962892
Volume Number	43
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Calibration Atmospheric measurements Gain measurement Time measurement Reflection Radiometry Satellite broadcasting Infrared spectra Atmospheric modeling Predictive models vicarious calibration Degradation field experiment gain offset onboard calibration radiative transfer responsivity spectral emissivity surface temperature
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Electrical and Electronic Engineering

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