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Outgassing models for Landsat-4 thematic mapper short wave infrared bands

By:
,
Edited by:
Butler J.J.
DOI: 10.1117/12.620160

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Abstract

Detector responses to the Internal Calibrator (IC) pulses in the Landsat-4 Thematic Mapper (TM) have been observed to follow an oscillatory behavior. This phenomenon is present only in the Short Wave Infrared (SWIR) bands and has been observed throughout the lifetime of the instrument, which was launched in July 1982 and imaged the Earth's surface until late 1993. These periodic changes in amplitude, which can be as large as 7.5 percent, are known as outgassing effects and are believed to be due to optical interference caused by a gradual buildup of an ice-like material on the window of the cryogenically cooled dewar containing the SWIR detectors. Similar outgassing effects in the Landsat-5 TM have been characterized using an optical thin-film model that relates detector behavior to the ice film growth rate, which was found to gradually decrease with time. A similar approach, which takes into consideration the different operational history of the instrument, has been applied in this study to three closely sampled data sets acquired throughout the lifetime of the Landsat-4 TM. Although Landsat-4 and Landsat-5 Thematic Mappers are essentially identical instruments, data generated from analyses of outgassing effects indicate subtle, but important, differences between the two. The estimated lifetime model could improve radiometric accuracy by as much as five percent.

Additional Publication Details

Publication type:
Conference Paper
Publication Subtype:
Conference Paper
Title:
Outgassing models for Landsat-4 thematic mapper short wave infrared bands
DOI:
10.1117/12.620160
Volume
5882
Year Published:
2005
Language:
English
First page:
1
Last page:
11
Number of Pages:
11
Conference Title:
Earth Observing Systems X
Conference Location:
San Diego, CA
Conference Date:
31 July 2005 through 2 August 2005