By M. D. Steven and J. A. Clark (Eds.)
Agricultural distant sensing has a big capability influence on agribusiness and the overseas commodity exchange during the improvement of structures to observe plants and yields at the nationwide and overseas scale. This quantity experiences the achievements of distant sensing in agriculture, establishes the present cutting-edge and appears at destiny advancements. the next issues are addressed - possibilities for distant sensing, ideas of distant sensing as utilized to agriculture, together with logistic issues and basic spectral features of crops, the estimation of biomass and productiveness, results of tension and its detection, discrimination and tracking and new concepts in making use of distant sensing
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Additional info for Applications of Remote Sensing in Agriculture
1983. INRA Publishers. , STANHILL, G. G. (1972). Diurnal variations of the visible and near infrared reflectance of a wheat crop. W. (1974). Leaf reflectance of near infrared. W. A. (1973). Optical parameters of leaves of 30 plant species. , CARDENAS, R. J. (1970). Relation of light reflectance to histological and physical evaluation of cotton leaf maturity. R. and CARDENAS, R. (1971). Age effect of cotton leaves on light reflectance, transmittance and absorptance and on water content and thickness.
6. 1 shows this phenomenon. The variations of red and near-infrared reflectances are represented as a function of the leaf area index (LAI, total leaf area per unit ground area). In the visible and middle-infrared the saturation level is reached for LAI around 3, and in the near-infrared for LAI around 5 or 6. But we must note that the value of the LAI corresponding to the saturation level also depends on the plant geometry. Higher LAI values are needed to reach this level with plants having erect leaves than with plants having horizontal leaves.
For LAI greater than 3 a saturation is observed. In the near-infrared the saturation occurs for LAI greater than 5. In the middle-infrared the background effect is also seen for relatively large LAI values. In this domain the bi-directional reflectance of a plant canopy can be strongly affected by surface soil moisture (Baret, Guyot, Bégué, Maurel and Podaire, 1988). 12. Effect of the crop row orientation and of the soil colour on the reflectance of a soybean canopy. 12, the crop row orientation with respect to the sun azimuth can have a large effect on the reflectance.