Bidirectional measurements of surface reflectance for view angle corrections of oblique imagery
Identifieur interne : 000A74 ( Main/Exploration ); précédent : 000A73; suivant : 000A75Bidirectional measurements of surface reflectance for view angle corrections of oblique imagery
Auteurs : R. D. Jackson [États-Unis] ; P. M. Teillet [Canada] ; P. N. Slater [États-Unis] ; G. Fedosejevs [États-Unis] ; M. F. Jasinski [États-Unis] ; J. K. Aase [États-Unis] ; M. S. Moran [États-Unis]Source :
- Remote Sensing of Environment [ 0034-4257 ] ; 1990.
Abstract
An apparatus for acquiring bidirectional reflectance-factor data was constructed and used over four surface types. Data sets were obtained over a headed wheat canopy, bare soil having several different roughness conditions, playa (dry lake bed), and gypsum sand. Results are presented in terms of relative bidirectional reflectance factors (BRFs) as a function of view angle at a number of solar zenith angles, nadir BRFs as a function of solar zenith angles, and, for wheat, vegetation indices as related to view and solar zenith angles. The wheat canopy exhibited the largest BRF changes with view angle. BRFs for the red and the near-infrared (NIR) bands measured over wheat did not have the same relationship with view angle. NIR/Red ratios calculated from nadir BRFs changed by nearly a factor of 2 when the solar zenith angle changed from 20° to 50°. BRF versus view angle relationships were similar for soils having smooth and intermediate rough surfaces but were considerably different for the roughest surface. Nadir BRF versus solar-zenith angle relationships were distinctly different for the three soil roughness levels. Of the various surfaces, BRFs for gypsum sand changed the least with view angle (10% at 30°).
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DOI: 10.1016/0034-4257(90)90017-G
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Jackson</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>U.S. Water Conservation Laboratory, Agricultural Research Service, USDA</wicri:regionArea><wicri:noRegion>USDA</wicri:noRegion></affiliation></author><author><name sortKey="Teillet, P M" sort="Teillet, P M" uniqKey="Teillet P" first="P. M." last="Teillet">P. M. Teillet</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Canada Centre for Remote Sensing, Ottawa</wicri:regionArea><wicri:noRegion>Ottawa</wicri:noRegion></affiliation></author><author><name sortKey="Slater, P N" sort="Slater, P N" uniqKey="Slater P" first="P. N." last="Slater">P. N. 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Moran</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>U.S. Water Conservation Laboratory, Agricultural Research Service, USDA</wicri:regionArea><wicri:noRegion>USDA</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Remote Sensing of Environment</title><title level="j" type="abbrev">RSE</title><idno type="ISSN">0034-4257</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1990">1990</date><biblScope unit="volume">32</biblScope><biblScope unit="issue">2–3</biblScope><biblScope unit="page" from="189">189</biblScope><biblScope unit="page" to="202">202</biblScope></imprint><idno type="ISSN">0034-4257</idno></series><idno type="istex">E7D044F48A11BAC2984CD444F35B82DE16FD4038</idno><idno type="DOI">10.1016/0034-4257(90)90017-G</idno><idno type="PII">0034-4257(90)90017-G</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0034-4257</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">An apparatus for acquiring bidirectional reflectance-factor data was constructed and used over four surface types. Data sets were obtained over a headed wheat canopy, bare soil having several different roughness conditions, playa (dry lake bed), and gypsum sand. Results are presented in terms of relative bidirectional reflectance factors (BRFs) as a function of view angle at a number of solar zenith angles, nadir BRFs as a function of solar zenith angles, and, for wheat, vegetation indices as related to view and solar zenith angles. The wheat canopy exhibited the largest BRF changes with view angle. BRFs for the red and the near-infrared (NIR) bands measured over wheat did not have the same relationship with view angle. NIR/Red ratios calculated from nadir BRFs changed by nearly a factor of 2 when the solar zenith angle changed from 20° to 50°. BRF versus view angle relationships were similar for soils having smooth and intermediate rough surfaces but were considerably different for the roughest surface. Nadir BRF versus solar-zenith angle relationships were distinctly different for the three soil roughness levels. Of the various surfaces, BRFs for gypsum sand changed the least with view angle (10% at 30°).</div></front></TEI><affiliations><list><country><li>Canada</li><li>États-Unis</li></country></list><tree><country name="États-Unis"><noRegion><name sortKey="Jackson, R D" sort="Jackson, R D" uniqKey="Jackson R" first="R. D." last="Jackson">R. D. Jackson</name></noRegion><name sortKey="Aase, J K" sort="Aase, J K" uniqKey="Aase J" first="J. K." last="Aase">J. K. Aase</name><name sortKey="Fedosejevs, G" sort="Fedosejevs, G" uniqKey="Fedosejevs G" first="G." last="Fedosejevs">G. Fedosejevs</name><name sortKey="Jasinski, M F" sort="Jasinski, M F" uniqKey="Jasinski M" first="M. F." last="Jasinski">M. F. Jasinski</name><name sortKey="Moran, M S" sort="Moran, M S" uniqKey="Moran M" first="M. S." last="Moran">M. S. 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