| By field experiments,we achieve the chlorophyll density and hyperspectral data of winter wheat at different nitrogenous levels and different periods, and investigate the relationship between chlorophyll density and derivative spectra of canopies,red edge parameters,NDVI,RVI by correlation analysis.It shows that the correlative relationship is good.Regression analysis was performed between these variables and chlorophyll density,estimation models about chlorophyll density has been built.Through the test of other samples,model has been build by using the first derivative spectra data at 745 nm,the second derivativespectra data at 733 nm,and amplitude of red edge are the better one of estimating chlorophyll density of winter wheat by hyperspectral remote sensing data. |