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Proceedings Paper

Roughness effects on thermal-infrared emissivities estimated from remotely sensed images
Author(s): Amit Mushkin; Iryna Danilina; Alan R. Gillespie; Lee K. Balick; Matthew F. McCabe
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Paper Abstract

Multispectral thermal-infrared images from the Mauna Loa caldera in Hawaii, USA are examined to study the effects of surface roughness on remotely retrieved emissivities. We find up to a 3% decrease in spectral contrast in ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) 90-m/pixel emissivities due to sub-pixel surface roughness variations on the caldera floor. A similar decrease in spectral contrast of emissivities extracted from MASTER (MODIS/ASTER Airborne Simulator) ~12.5-m/pixel data can be described as a function of increasing surface roughness, which was measured remotely from ASTER 15-m/pixel stereo images. The ratio between ASTER stereo images provides a measure of sub-pixel surface-roughness variations across the scene. These independent roughness estimates complement a radiosity model designed to quantify the unresolved effects of multiple scattering and differential solar heating due to sub-pixel roughness elements and to compensate for both sub-pixel temperature dispersion and cavity radiation on TIR measurements.

Paper Details

Date Published: 29 October 2007
PDF: 10 pages
Proc. SPIE 6749, Remote Sensing for Environmental Monitoring, GIS Applications, and Geology VII, 67492V (29 October 2007); doi: 10.1117/12.738125
Show Author Affiliations
Amit Mushkin, Univ. of Washington (United States)
Iryna Danilina, Univ. of Washington (United States)
Alan R. Gillespie, Univ. of Washington (United States)
Lee K. Balick, Los Alamos National Lab. (United States)
Matthew F. McCabe, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 6749:
Remote Sensing for Environmental Monitoring, GIS Applications, and Geology VII
Manfred Ehlers; Ulrich Michel, Editor(s)

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