Roughness effects on thermal-infrared emissivities estimated from remotely sensed images

Amit Mushkin; Iryna Danilina; Alan R. Gillespie; Lee K. Balick; Matthew F. McCabe

doi:10.1117/12.738125

29 October 2007 Roughness effects on thermal-infrared emissivities estimated from remotely sensed images

Amit Mushkin, Iryna Danilina, Alan R. Gillespie, Lee K. Balick, Matthew F. McCabe

Proceedings Volume 6749, Remote Sensing for Environmental Monitoring, GIS Applications, and Geology VII; 67492V (2007) https://doi.org/10.1117/12.738125
Event: SPIE Remote Sensing, 2007, Florence, Italy

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.

Citation Download Citation

Amit Mushkin, Iryna Danilina, Alan R. Gillespie, Lee K. Balick, and Matthew F. McCabe "Roughness effects on thermal-infrared emissivities estimated from remotely sensed images", Proc. SPIE 6749, Remote Sensing for Environmental Monitoring, GIS Applications, and Geology VII, 67492V (29 October 2007); https://doi.org/10.1117/12.738125

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