Spectral data analysis of ground objects in Chao Lake basin

Based on a great deal of spectral data for different kinds of ground objects which were denoised by wavelet transform method, the spectral characteristics and changing rules of water, paddy field, wheat, cole and vegetable greenhouse in Chao Lake basin were analyzed with ASD portable spectrum analyzer by field investigation and plot survey. The spectral data of typical ground objects in Chao Lake basin were also processed by using mathematics technology such as de-noising technology of derivative spectrum technology and normalization processing technology. It was shows that wavelet transform had advantage in de-noising because it could remove the noise from signal as well as preserve the detail information; derivative spectrum and normalization processing technology had better practicability in suppressing background effect and emphasizing the signal of objects.