Improved outgassing models for the Landsat-5 thematic mapper

By: , and 



The Landsat-5 (L5) Thematic Mapper (TM) detectors of the short wave infrared (SWIR) bands 5 and 7 are maintained on cryogenic temperatures to minimize thermal noise and allow adequate detection of scene energy. Over the instrument's lifetime, gain oscillations are observed in these bands that are caused by an ice-like contaminant that gradually builds up on the window of a dewar that houses these bands' detectors. This process of icing, an effect of material outgassing in space, is detected and characterized through observations of Internal Calibrator (IC) data. Analyses of IC data indicated three to five percent uncertainty in absolute gain estimates due to this icing phenomenon. The thin-film interference lifetime models implemented in the image product generation systems at the U.S. Geological Survey (USGS) Center for Earth Resources Observation and Science (EROS) successfully remove up to 80 percent of the icing effects for the image acquisition period from the satellite's launch in 1984 until 2001; however, their correction ability was found to be much lower for the time thereafter. This study concentrates on improving the estimates of the contaminant film growth rate and the associated change in the period of gain oscillations. The goal is to provide model parameters with the potential to correct 70 to 80 percent of gain uncertainties caused by outgassing effects in L5 TM bands 5 and 7 over the instrument's entire lifetime. ?? 2007 IEEE.

Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Improved outgassing models for the Landsat-5 thematic mapper
ISBN 1424412129; 9781424412129
DOI 10.1109/IGARSS.2007.4423440
Year Published 2007
Language English
Larger Work Title International Geoscience and Remote Sensing Symposium (IGARSS)
First page 2860
Last page 2863
Conference Title 2007 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2007
Conference Location Barcelona
Conference Date 23 June 2007 through 28 June 2007
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