Stability of landsat-4 thematic mapper outgassing models

By:  and 



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.

Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Stability of landsat-4 thematic mapper outgassing models
ISBN 0819463752; 9780819463753
DOI 10.1117/12.683264
Volume 6296
Year Published 2006
Language English
Larger Work Title Proceedings of SPIE - The International Society for Optical Engineering
Conference Title Earth Observing Systems XI
Conference Location San Diego, CA
Conference Date 14 August 2006 through 16 August 2006