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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 21, Iss. 20 — Oct. 15, 1982
  • pp: 3766–3774

Variation of directional reflectance factors with structural changes of a developing alfalfa canopy

J. A. Kirchner, D. S. Kimes, and J. E. McMurtrey, III  »View Author Affiliations


Applied Optics, Vol. 21, Issue 20, pp. 3766-3774 (1982)
http://dx.doi.org/10.1364/AO.21.003766


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Abstract

Directional reflectance factors of an alfalfa canopy were determined and related to canopy structure, agronomic variables, and irradiance conditions at four periods during a cutting cycle. Nadir and off-nadir reflectance factors decreased with increasing biomass in Thematic Mapper band 3 (0.63–0.69 μm) and increased with increasing biomass in band 4 (0.76–0.90 μm). The sensor view angle had less impact on perceived reflectance as the alfalfa progressed from an erectophile canopy of stems after harvest to a near planophile canopy of leaves at maturity. Studies of directional reflectance are needed for testing and upgrading vegetation canopy models and to aid in the complex interpretation problems presented by aircraft scanners and pointable satellites where illumination and viewing geometries may vary widely. Distinct changes in the patterns of radiance observed by a sensor as structural and biomass changes occur are keys to monitoring the growth and condition of crops.

© 1982 Optical Society of America

History
Original Manuscript: May 1, 1982
Published: October 15, 1982

Citation
J. A. Kirchner, D. S. Kimes, and J. E. McMurtrey, "Variation of directional reflectance factors with structural changes of a developing alfalfa canopy," Appl. Opt. 21, 3766-3774 (1982)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-21-20-3766


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References

  1. J. A. Smith, K. J. Ranson, MRS Literature Survey of Bidirectional Reflectance, ORI, Inc. Contract Report to NASA/GSFC (Oct.1979).
  2. D. S. Kimes, J. A. Smith, K. J. Ranson, Photogramm. Eng. Remote Sensing 46, 1563 (1980).
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  15. C. C. Schnetzler, “On the Use of Off-Nadir Pointing for Increased Temporal Resolution of Earth Observing Satellite Systems,” NASA Tech. Memo. 82139 (1981), 27 pp.

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