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