Sources of Scattering from Vegetation Canopies at 10 GHz
High-resolution backscatter measurements were made at X-band, with vertical polarization, and incidence angles of 30° and 50°, for winter wheat, soybeans, and corn during the summer of 1984. Plants were observed both under natural conditions and with partial-to-complete defoliation. The resolution volume of the measurement system is better than 20 × 20 × 11.25 cm3 within the entire range of measurements. Results are presented as a radar image, which also provides information on the spatial distribution of the (attenuated) scattering inside the canopy observed under natural conditions. Measured results indicate that: 1) for the full-grown wheat plants, heads are the dominant scatterers at the early heading stage and the ground is the dominant scatterer at the later growth stages; 2) for the soybeans, returns are mostly from the upper 30-cm portion of the plants, and leaves and stems dominate the radar signal at 30° and 50° incidence angles, respectively; 3) for the corn plants, leaves are the single dominant scatterers at both angles of incidence; and 4) ground returns are relatively unimportant as they are highly attenuated by the vegetation cover.
L. Wu et al., "Sources of Scattering from Vegetation Canopies at 10 GHz," IEEE Transactions on Geoscience and Remote Sensing, vol. GE-23, no. 5, pp. 737-745, Institute of Electrical and Electronics Engineers (IEEE), Sep 1985.
The definitive version is available at http://dx.doi.org/10.1109/TGRS.1985.289392
Electrical and Computer Engineering
Keywords and Phrases
Microwaves - Scattering; Remote Sensing - Imaging Techniques; Vegetation Mapping; Radar Imaging
International Standard Serial Number (ISSN)
Article - Journal
© 1985 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.