spectral types
4.Using spectral data observed in Urumqi and Fukang, grass yield data and NOAA/AVHRR data in Urumqi, Fukang, and Altai during 1992～1994, the spectral monitoring models and satellite remote sensing monitoring models of grass yield for different natural grassland types in North Xinjiang are established. This is the basic work for the establishment of grassland operational monitoring system based on remote sensing data.
5.According to the spectral shape, absorption strength and frequency, the IR spectra of Yunlong cassiterites might be divided into two types, i. e., type A and type B. The spectra of type A have the same characteristics as the spectra of cassiterites from Nb-, Ta-bearing pegmatite type and granite type tin deposits, whereas the spectra of type B are identical with those of cassiterites from hydrothermal tin deposits in features.
