DocumentCode :
326494
Title :
Airborne measurements of forest and agricultural land surface emissivity at millimetre wavelengths
Author :
Hewison, Tim J.
Author_Institution :
UK Met. Office (Remote Sensing), Farnborough, UK
Volume :
5
fYear :
1998
fDate :
6-10 Jul 1998
Firstpage :
2417
Abstract :
Passive microwave radiometers have been operated on an aircraft over the same (NOPEX) area of Sweden, near Uppsala in September 1885 and March 1887. Their measurements have allowed the calculation of the emissivity or boreal forest and agricultural land surfaces at 24, 50, 88 and 167 GHz over a range of incidence angles and polarisations. These results show consistent differences between dense forestry, where the emissivity is close to 1 and open land, where it is approximately 0.96. These differences are examined and a model is presented to parameterise these surfaces by use of a Debye-like effective permittivity and Fresnel´s reflection coefficients
Keywords :
agriculture; forestry; geophysical techniques; radiometry; remote sensing; 24 to 157 GHz; AD 1985; AD 1987; Debye-like effective permittivity; EHF; Fresnel´s reflection coefficients; Sweden; Uppsala; agriculture; airborne observations; emissivity; forest; forestry; geophysical measurement technique; incidence angles; land surface; microwave radiometry; millimetre wave; polarimetry; polarisation; polarization; remote sensing; terrain mapping; vegetation mapping; Land surface; Ocean temperature; Optical scattering; Optical surface waves; Permittivity; Radiometers; Sea measurements; Sea surface; Surface waves; Wavelength measurement;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Geoscience and Remote Sensing Symposium Proceedings, 1998. IGARSS '98. 1998 IEEE International
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-4403-0
Type :
conf
DOI :
10.1109/IGARSS.1998.702232
Filename :
702232
Link To Document :
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