Title :
A model for instantaneous FAPAR retrieval: Theory and validation
Author :
Tao, Xin ; Wang, Dacheng ; Wu, Daihui ; Yan, Binyan ; Fan, Wenjie ; Xu, Xiru ; Yao, Yanjuan
Author_Institution :
Inst. of Remote Sensing & GIS, Peking Univ., Beijing, China
Abstract :
The Fraction of Absorbed Photosynthetically Active Radiation (FAPAR) is a critical input parameter to many climate and ecological models. Its calculation accuracy from remote sensing images directly influences the estimation of net primary productivity (NPP) and carbon cycle. This paper presents a hybrid model combining the characteristics of geometric optic model and radiation transfer model. It considers the illuminated and shadow area of the canopy and soil, as well as the multiple scattering between the canopy and soil. The Monte Carlo simulations of canopy FAPAR are also conducted and the results are compared with model results. In addition, we did the simulation of FAPAR daily change by the model and MC method, and compare the results with field measured daily data of FAPAR. All the results prove the model effective.
Keywords :
Monte Carlo methods; atmospheric boundary layer; geophysical techniques; radiative transfer; remote sensing; soil; Fraction of Absorbed Photosynthetically Active Radiation; Monte Carlo simulation; canopy; carbon cycle; geometric optic model; instantaneous FAPAR retrieval; net primary productivity estimation; radiation transfer model; remote sensing; soil; Absorption; Biological system modeling; Light scattering; Optical scattering; Particle scattering; Reflectivity; Remote sensing; Soil; Solid modeling; Vegetation; Fraction of Absorbed Photosynthetically Active Radiation (FAPAR); Monte Carlo simulation; hybrid model; instantaneous FAPAR; remote sensing retrieval;
Conference_Titel :
Geoscience and Remote Sensing Symposium,2009 IEEE International,IGARSS 2009
Conference_Location :
Cape Town
Print_ISBN :
978-1-4244-3394-0
Electronic_ISBN :
978-1-4244-3395-7
DOI :
10.1109/IGARSS.2009.5416906
