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Proceedings Paper

Stability of Landsat-4 thematic mapper outgassing models
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Paper Abstract

Oscillations in radiometric gains of the short wave infrared (SWIR) bands in Landsat-4 (L4) and Landsat-5 (L5) Thematic Mappers (TMs) are observed through an analysis of detector responses to the Internal Calibrator (IC) pulses. The oscillations are believed to be caused by an interference effect due to a contaminant film buildup on the window of the cryogenically cooled dewar that houses these detectors. This process of contamination, referred to as outgassing effects, has been well characterized using an optical thin-film model that relates detector responses to the accumulated film thickness and its growth rate. The current models for L4 TM are based on average detector responses to the second brightest IC lamp and have been derived from three data sets acquired during different times throughout the instrument's lifetime. Unlike in L5 TM outgassing characterization, it was found that the L4 TM responses to all three IC lamps can be used to provide accurate characterization and correction for outgassing effects. The analysis of single detector responses revealed an up to five percent difference in the estimated oscillating periods and also indicated a gradual variation of contaminant growth rate over the focal plane.

Paper Details

Date Published: 8 September 2006
PDF: 11 pages
Proc. SPIE 6296, Earth Observing Systems XI, 62960E (8 September 2006); doi: 10.1117/12.683264
Show Author Affiliations
Esad Micijevic, Science Applications International Corp. (United States)
U.S. Geological Survey (United States)
Ctr. for Earth Resources Observation and Science (United States)
Gyanesh Chander, Science Applications International Corp. (United States)
U.S. Geological Survey (United States)
Ctr. for Earth Resources Observation and Science (United States)


Published in SPIE Proceedings Vol. 6296:
Earth Observing Systems XI
James J. Butler, Editor(s)

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