Reflection from a field of randomly located vertical protrusions
Applied Optics, Vol. 23, Issue 12, pp. 1931-1936 (1984)
http://dx.doi.org/10.1364/AO.23.001931
Acrobat PDF (745 KB)
Abstract
Reflection from a field of randomly located, thin vertical cylinders is analyzed. The bidirectional reflectivity Rdf for the direct solar beam (first reflection) is (Equation) where z is the azimuth (in radians) measured in a horizontal plane from the antisolar direction, θ0 is the zenith angle of the solar beam, θ is the viewing zenith angle, s is the projection on a vertical plane of cylindrical sections over a unit area, and rc is the Lambert law spectral reflectivity of the cylinders. The bidirectional reflectivity thus tends to γc π tan θ0/4 at the azimuth π and at very large viewing zenith angles, such that tanθ »tanθ0 and tanθ0 ≥ 1. A comparison with the bidirectional reflectivities measured over dense vegetation of a Florida swamp indicates that this model describes a highly significant component of this canopy reflection. The possibility of extracting information about the reflectivity of the plants material (rc) and about the canopy structure (s) from the reflectivities measured at various solar elevations is discussed and an approach for such extraction is formulated. The extraction of rc appears practical; that of s, difficult.
Citation
Joseph Otterman and George H. Weiss, "Reflection from a field of randomly located vertical protrusions," Appl. Opt. 23, 1931-1936 (1984)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-23-12-1931
You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Log in to access OSA Member Subscription
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Log in to access OSA Member Subscription
You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Log in to access OSA Member Subscription
« Previous Article | Next Article »
OSA is a member of 