On-demand Modeling System
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1. Retrieve biochemical and biophysical parameters at leaf- and canopy levels |
| The coupled PROSPECT-SAIL2 (PROSAIL2) radiative transfer model (Zhang et al., 2005, 2006) and daily MODIS image data (500-m spatial resolution) are used to simultaneously retrieve both leaf-level parameters (e.g., chlorophyll, water, leaf specific weight) and canopy-level parameters (e.g., leaf area index) for individual sites, respectively. |
It consists of four steps:
- a user provides latitude and longitude information for a site
- a computer server implements the web-based procedure to order daily MODIS data from the USGS EDC
- a computer server runs inversion of the PROSAIL2 model to retrieve biochemical and biophysical parameters for the site
- the user is informed after the inversion of the PROSAIL2 model is competed, and the inversion results are then delivered to the user
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| Users are encouraged to provide quantitative assessment on the inversion results, which are likely to help us to further improvement of the PROSAIL2 model and simulations |
| Because the inversion of the PROSAIL2 model requires intensive computation and large disk space, a user needs to contact the research group for approval. In addition to inversion of the PROSAIL2 model for individual sites, a simulation over 10-km by 10-km area can be arranged, if sufficient ground data and hyperspectral or hyper-spatial image data are available for evaluation. |
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[click here for user to provide latitude and longitude information for a field site]
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