Title :
Influence of Sun-view geometries on the relationships among vegetation indices, LAI, and absorbed PAR
Author :
Epiphanio, José C N ; Huete, Alfredo R. ; Liu, Hui Qing
Author_Institution :
Dept. of Soil & Water Sci., Arizona Univ., Tucson, AZ, USA
Abstract :
The absorbed photosynthetically active radiation (APAR) and leaf area index (LAI) of vegetated surfaces have been addressed as important parameters to be included in growth and productivity models. However, surface heterogeneities render the signal detected by the remote sensor sensitive to illumination/view geometry and background (e.g. soil, litter) reflectance properties. In addition, there is the influence of the intervening and variable atmosphere. In this study, the Myneni radiative canopy model in conjunction with the `65´ atmospheric model, were used to simulate the optical properties of both uniform and heterogeneous vegetated surfaces. The relationships among fAPAR, LAI, and VIs under various Sun-view geometries are investigated
Keywords :
forestry; geophysical techniques; infrared imaging; remote sensing; 65 atmospheric model; LAI; Myneni radiative canopy model; Sun-view geometry; absorbed PAR; forest forestry; geophysical measurement technique; illumination angle; leaf area index; light scattering; optical imaging; optical properties; optical property; photosynthetically active radiation; remote sensing; vegetated surface; vegetation; view geometry; visible IR infrared; Atmosphere; Atmospheric modeling; Geometrical optics; Geometry; Lighting; Productivity; Reflectivity; Remote sensing; Signal detection; Soil;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 1994. IGARSS '94. Surface and Atmospheric Remote Sensing: Technologies, Data Analysis and Interpretation., International
Conference_Location :
Pasadena, CA
Print_ISBN :
0-7803-1497-2
DOI :
10.1109/IGARSS.1994.399467
