Dr.ir. B.A.M. Bouman.
Research Institute for Agrobiology and Soil Fertility (AB-DLO)
Dept. Agrosystems Research
6700 AA Wageningen
Fax : +31.8370.23110
The model simulates daily growth of a winter wheat crop on the basis of underlying physiological and physical processes (e.g. light interception, photosynthesis, respiration), and its optical reflectance and radar backscatter on the basis of physical interaction processes. The crop model part is SUCROS87 for potential crop growth (i.e. ample supply of water and nutrients, no pests, weeds and diseases). Rate of dry matter accumulation is a function of irradiation, temperature and crop characteristics. The optical reflectance model is EXTRAD: optical reflectance is simulated in the green, red and infrared bands from soil and crop optical properties, leaf area index, canopy architecture and illumination conditions. The vegetation indices NDVI, WDVI and IR/R-ratio are calculated. The radar backscatter model is CLOUD: radar backscatter (gamma) is simulated from the amount of water in the soil and in the canopy and from soil and canopy backscatter characteristics for several angles of incidence, VV and HH polarization and in Ku1, Ku2, X, C, S and L-bands. All submodels have been parameterized and validated on data collected during several remote sensing campaigns in (South-)Flevoland, The Netherlands, between 1980-1988 (ground based ROVE, Agriscatt).
CAMASE (Concerted Action for the development and testing of quantitative methods for research on Agricultural Systems and the Environment).