Title :
Bragg-scattering resonance in VHF-SAR forestry data
Author :
Ulander, L.M.H. ; LeToan, Thuy
Author_Institution :
Swedish Defence Res. Establ., Linkoping, Sweden
Abstract :
Bragg resonance is observed in VHF-band SAR data from regularly spaced tree rows. Enhanced backscattering is present when the look direction is perpendicular to the rows. Given a constant row spacing, Bragg resonance will occur for higher frequencies as the incidence angle decreases. Analysis of narrow-band data confirm this mechanism. Periodic intensity patterns are also observed in selected stands, which are related to dislocations and/or small changes in row spacing. The resonance frequency can be used to determine row spacing and thinning
Keywords :
backscatter; forestry; periodic structures; radar cross-sections; radar theory; remote sensing by radar; synthetic aperture radar; vegetation mapping; Bragg resonance; Bragg-scattering resonance; SAR; VHF; backscatter; enhanced backscattering; forest; forestry; geophysical measurement technique; incidence angle; look direction; periodic intensity pattern; periodic structure; radar remote sensing; radar scattering; regularly spaced tree row; resonance frequency; row spacing; synthetic aperture radar; thinning; vegetation mapping; Backscatter; Bandwidth; Biosphere; Data analysis; Forestry; Narrowband; Resonance; Resonant frequency; Scattering; Testing;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 1999. IGARSS '99 Proceedings. IEEE 1999 International
Conference_Location :
Hamburg
Print_ISBN :
0-7803-5207-6
DOI :
10.1109/IGARSS.1999.774975
