In view of the lack of theoretical research on the extraction and inversion of hyperspectral features in ground-sky synchronization, the authors, in combination with the principle of “maximum density within class and maximum distance between classes”, studied the separability and importance selection of the spectra for different ground objects in different spectral regions, proposed an improved projection pursuit classification method, and realized the projection pursuit method based on weighted feature band. In the case study, the spectral and PHI hyperspectral images of different ground objects in the experimental area were collected synchronously and, combined with the measured spectra on the ground, constructed different classification rules around the strategy of overall optimization and local optimization. It was applied to the classification of PHI hyperspectral image to extract the information of vegetation and non-vegetation and to subdivide more than ten different kinds of ground objects. The results show that 8 spectral areas are important separability bands of different vegetation: 420 nm, 520 nm, 570 nm , 610 nm, 660 nm, 690 nm, 715 nm, and 810 nm. The classification results have the advantages of strong stratification, clear outline of vegetation and avoiding shadow influence.
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2019, Vol. 31 
