DocumentCode :
1158561
Title :
Backscattering properties of boreal forests at the C- and X-bands
Author :
Pulliainen, Jouni T. ; Heiska, Kari ; Hyyppä, Juha ; Hallikainen, Martti T.
Author_Institution :
Lab. of Space Technol., Helsinki Univ. of Technol., Espoo, Finland
Volume :
32
Issue :
5
fYear :
1994
fDate :
9/1/1994 12:00:00 AM
Firstpage :
1041
Lastpage :
1050
Abstract :
The backscattering properties of boreal forests are studied using empirical airborne and spaceborne radar data from Finland. Airborne measurements were carried out in the summer of 1992 by the HUTSCAT scatterometer at the Teijo test area in southern Finland. The HUTSCAT scatterometer is an eight-channel helicopter-borne profiling radar operating at the C- and X-bands. The ranging capability of the HUTSCAT scatterometer was employed in the semiempirical modeling of forest backscatter. The backscatter profile information was used in the analysis of the canopy transmissivity and the canopy backscattering coefficient by distinguishing backscattering contributions from the canopy and the ground. Additionally, ERS-1 C-band satellite SAR measurements were obtained for the Teijo test area and for the reference test area in Sodankyla in northern Finland. The radar results were compared with operational ground-based forest assessment data on forest compartments (stands) of the area. The key parameter investigated was the stem (bole) volume per hectare. The results obtained show the behavior of the canopy transmissivity and the canopy backscatter as a function of stem volume (directly related to the forest biomass). The influence of seasonal and diurnal changes on, and the effects of the changes in soil moisture to the backscattering coefficient were also investigated
Keywords :
backscatter; forestry; geophysical techniques; radar cross-sections; remote sensing by radar; synthetic aperture radar; C-band SHF microwave; Finland AD 1992; HUTSCAT scatterometer; SAR; Sodankyla; Teijo; X-band; backscatter; backscattering properties; biomass; boreal forest; canopy transmissivity; eight-channel helicopter-borne profiling radar; forestry; geophysical measurement technique; radar remote sensing; radar scattering; radiowave reflection; stem bole; vegetation mapping; Area measurement; Backscatter; Biomass; Information analysis; Radar measurements; Radar scattering; Satellites; Soil moisture; Spaceborne radar; Testing;
fLanguage :
English
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
Publisher :
ieee
ISSN :
0196-2892
Type :
jour
DOI :
10.1109/36.312892
Filename :
312892
Link To Document :
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