Prediction of winter wheat grain protein content based on multiangulal hyperspectral information

Multi-time spectrum of winter wheat canopy at different angle were measured by trial, the relation among nitrogen content of wheat ears, protein content of wheat grains and spectrum of wheat canopy were studied. As a result, the correlation between nitrogen content of wheat ears at waxy stage and protein content of wheat grains was significative, between nitrogen content of wheat ears at waxy stage and ratio vegetation index (RVI[670, 890]) of backwards level observation angle was significative. The improved model of protein content of wheat grains based on observation angle was GPC% = 25.815-14.035RVI(0 degrees) r(2) = 0. 8404, the r(2) of the improved model was 35.12% higher than of the tradition model, the RMSE and exact ratio of improved model were 0. 7358, 95.28, the RMSE was 0. 9896 lower than of traditional model, and the precision of improved model was 6.64% higher than of traditional model.