Estimation of forest LAI by inverting canopy reflectance models and multi-angle imagery |
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| Authors: | X Y Wang W H Qin GQ Sun J Zhu |
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| Institution: | 1. Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration of Northwest China, Ningxia University, Yingchuan, China;2. Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwestern China of Ministry of Education, Ningxia University, Yinchuan, China;3. SSAI/NASA GSFC, Greenbelt, MD, USA;4. Department of Geography, University of Maryland, College Park, MD, USA;5. The State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China;6. College of Town-Country Planning and Land Resources, Hebei GEO University, Shijiazhuang, China |
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| Abstract: | Computer simulation models have seldom been applied for estimating the structural and biophysical variables of forest canopy. In this study, an approach for the estimation of leaf area index (LAI) using the information contained in hyperspectral, multi-angle images and the inversion of a computer simulation model are explored. For this purpose, L-systems combined with forest growth model ZELIG were applied to render 3-D forest architectural scenarios. The Radiosity-graphics combined model (RGM) was used to estimate forest LAI from the Compact High-Resolution Imaging Spectrometer/Project for On-Board Autonomy (CHRIS/PROBA) data. LAI inversion was performed using the look-up table (LUT) method. The estimated LAI was evaluated against in situ LAI measurement and compared against the LAI predictions from CHRIS data obtained using the Li-Strahler geometric-optical canopy reflectance model (GOMS). The results indicated that the method used in this study can be efficient strategy to estimate LAI by RGM model inversion. |
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| Keywords: | RGM model GOMS model ZELIG model CHRIS data LAI estimation |
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