@inproceedings{ec14ef4feeed40b68dbda35d5449326a,
title = "Roughness effects on thermal-infrared emissivities estimated from remotely sensed images",
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.",
keywords = "Emissivity, Surface roughness, Thermal infrared",
author = "Amit Mushkin and Iryna Danilina and Gillespie, {Alan R.} and Balick, {Lee K.} and McCabe, {Matthew F.}",
year = "2007",
doi = "10.1117/12.738125",
language = "English (US)",
isbn = "9780819469076",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
booktitle = "Remote Sensing for Environmental Monitoring, GIS Applications, and Geology VII",
note = "Remote Sensing for Environmental Monitoring, GIS Applications, and Geology VII ; Conference date: 17-09-2007 Through 20-09-2007",
}