Abstract: An application of using HJ-1A/B-CCD images in extracting the distribution of winter wheat and rape in Hubei province was searched in this paper NDVI curve of winter wheat and rape in different growth stage were calculated by different periods of CCD images,the spectral features of the winter wheat,rape and other typical features were obtained according to the field investigation and measurement.The best phase for extracting rape and winter wheat and the color of different surface objects in CDD image were confirmed.The maximum likelihood classification method was taken to extract winter wheat and rape in CDD images.The results indicated that: HJ-1A/B-CCD data could be used to extract the winter wheat and rape,the extracting precision was 95.48%;the late 10 day of March was the best phase for extracting winter wheat and rape using HJ-1A/B satellite in Hubei province.In the best phase,winter wheat and rape had different spectrums and CCD image color,and their sample distributions satisfied the normal distribution,so the maximum likelihood method can be used to extract the distribution of winter wheat and rape.

Key words: HJ-1A/1B-CCD images, Winter wheat and rape, Surface object spectrum, Maximum likelihood classification