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Detecting forest structure and biomass with C-band multipolarization radar - Physical model and field tests
External Online Source: doi:10.1016/0034-4257(87)90061-7
Author and Affiliation:
Westman, Walter E.(NASA Ames Research Center, Moffett Field, CA, United States)
Paris, Jack F.(California Institute of Technology, Jet Propulsion Laboratory, Pasadena, United States)
Abstract: The ability of C-band radar (4.75 GHz) to discriminate features of forest structure, including biomass, is tested using a truck-mounted scatterometer for field tests on a 1.5-3.0 m pygmy forest of cypress (Cupressus pygmaea) and pine (Pinus contorta ssp, Bolanderi) near Mendocino, CA. In all, 31 structural variables of the forest are quantified at seven sites. Also measured was the backscatter from a life-sized physical model of the pygmy forest, composed of nine wooden trees with 'leafy branches' of sponge-wrapped dowels. This model enabled independent testing of the effects of stem, branch, and leafy branch biomass, branch angle, and moisture content on radar backscatter. Field results suggested that surface area of leaves played a greater role in leaf scattering properties than leaf biomass per se. Tree leaf area index was strongly correlated with vertically polarized power backscatter (r = 0.94; P less than 0.01). Field results suggested that the scattering role of leaf water is enhanced as leaf surface area per unit leaf mass increases; i.e., as the moist scattering surfaces become more dispersed. Fog condensate caused a measurable rise in forest backscatter, both from surface and internal rises in water content. Tree branch mass per unit area was highly correlated with cross-polarized backscatter in the field (r = 0.93; P less than 0.01), a result also seen in the physical model.
Publication Date: Jul 01, 1987
Document ID:
19870059269
(Acquired Nov 28, 1995)
Accession Number: 87A46543
Subject Category: EARTH RESOURCES AND REMOTE SENSING
Document Type: Journal Article
Publication Information: Remote Sensing of Environment (ISSN 0034-4257); 22; 249-269
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: NASA Ames Research Center; Moffett Field, CA, United States
Jet Propulsion Lab., California Inst. of Tech.; Pasadena, CA, United States
Description: 21p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: BIOMASS; C BAND; FORESTS; RADAR IMAGERY; SYNTHETIC APERTURE RADAR; BACKSCATTERING; CANOPIES (VEGETATION); ENVIRONMENT SIMULATION; LEAF AREA INDEX; LEAVES; SCATTEROMETERS; SHUTTLE IMAGING RADAR
Imprint And Other Notes: Remote Sensing of Environment (ISSN 0034-4257), vol. 22, July 1987, p. 249-269.
Availability Source: Other Sources
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