Two-temperature method for measuring emissivity

Spectral emissivity can be uniquely determined from radiance measurements if the object can be observed at two different temperatures. The advantage of this approach is that the spectral emissivity is determined without a priori assumptions about spectral shape. Because the different temperatures ar...

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Bibliographic Details
Published in:Remote sensing of environment 1992-11, Vol.42 (2), p.117-121
Main Author: Watson, Ken
Format: Article
Language:English
Subjects:
BIOLOGICAL RHYTHMS
CONTENIDO DE AGUA EN EL SUELO
EMISSION
ESPECTROMETRIA
METHODE
METHODS
METODOS
MULTISPECTRAL IMAGERY
radiance measurement
REMOTE SENSING
RITMOS BIOLOGICOS
RYTHME BIOLOGIQUE
SOIL
SOIL WATER CONTENT
SOL
SPECTRAL DATA
SPECTROMETRIE
SPECTROMETRY
SUELO
SURFACES
TELEDETECCION
TELEDETECTION
TEMPERATURA
TEMPERATURE
TENEUR EN EAU DU SOL
VEGETACION
VEGETATION
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Summary:Spectral emissivity can be uniquely determined from radiance measurements if the object can be observed at two different temperatures. The advantage of this approach is that the spectral emissivity is determined without a priori assumptions about spectral shape. Because the different temperatures are obtained by observing the scene at two times in the diurnal cycle (optimally after midday and midnight), the method assumes that emissivity is temporally invariant. This is valid for rocks and dry soils, not well established for vegetation, and not true when changes in soil moisture occur between the measurements. Accurate image registration and satisfactory signal:noise are critical factors that limit extensive use of this method.
ISSN:0034-4257
1879-0704
DOI:10.1016/0034-4257(92)90095-2