Lord Daniel, Desjardins R. L., Dubé P. A. et Brach E. J.. (1985). Variations of crop canopy spectral reflectance measurements under changing sky conditions. Photogrammetric Engineering and Remote Sensing, 51, (6), p. 689-695.
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Résumé
The possibility of using reflectance data collected under both cloudy and sunny conditions is studied. Extrenle values of red and far-red reflectances measured directly over bare soil and crop canopies during intermittently cloudy conditions can differ by more than 100 percent and 60 percent, respectively. Eliminating the irradiance variations by using only data collected under sunny conditions reduced such variation to within 1 percent for bare soil and to within 8 percent and 20 percent for crop canopy red and far-red reflectances, respectively. In general, the reflectances measured under cloudy conditions with relatively constant irradiance values are constant and approximately 10 percent larger than the ones measured at similar sun angles during sunny conditions. This result is independent of the species and the spectral regions under study.
| Type de document: | Article publié dans une revue avec comité d'évaluation |
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| Volume: | 51 |
| Numéro: | 6 |
| Pages: | p. 689-695 |
| Version évaluée par les pairs: | Oui |
| Date: | 1985 |
| Sujets: | Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes |
| Département, module, service et unité de recherche: | Départements et modules > Département des sciences fondamentales |
| Mots-clés: | crop canopy, spectral reflectance, cloud |
| Déposé le: | 15 janv. 2016 03:21 |
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| Dernière modification: | 15 janv. 2016 03:21 |
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