Figure 4-1A shows the 3-D graphic display of any imaging spectrometer data. The axis X in the 
figure represents any profile in the image, Y is represented as the spectral wavelength and Z 
is the reflectance value represented as the DN. Figure 4-1B is the plane projection of the 3- D 
display. 
Fig. 4-1 3-D display of MAIS 
A—3-D display and its projection 
B—plane presentation 
4). Mineral Spectral Absorption Index (MAIS) Technique 
The Mineral Spectral Absorption Index (MAIS)is a measure of the absorption faeture for certain 
minerals. For each spectral absorption faeture derived from imaging spectrometer data the some 
wavelengths in the absorption peak mi, m 2 , m 3 and the absorption shoulder in both sides Lu L 2 , 
L 8 and Eu R 2 , R a can be used as the factors for MSAI determination (Wang Jinnian et al, 1993). 
aiLn + a 2 L 2 + aaLs 
MSAI=A- arctg ( ) +B 
Ciffii+C 2 m 2 tC 3 m 3 
Where: A, В and a, b, c are the coefficients. 
The MSAI always determined for the fixed wavelength. For instance, the MSAI near the 2. 192 Mm 
is represented the absorption by clay minerals such as sericite, kaolinite and pyrophyl 1 ite etc. 
the MSAI naer the wavelength of 2.330 is represented the absorption by carbonate minerals such 
as calcite, donomite etc. 
5. Analysis and Application of Imaging Spectrometer Data 
a. Mapping of gold mineralization 
By use of the high spectral resolution remote sensing information extraction and mapping 
techniuques, the alteration zones associated with gold mineralization in the West Zhunger 
Basin Xinjiang China have been analysed and mapped. 
The procedure of the alteraiton information extraction and mapping is shown in Fig. 4-2. 
b. Mineral identification 
Many minerals have their spectral absorption features, in the SWIR spectral region, which are 
mainly caused by OH, HOH and C0 3 containing in the rocks. 
Based on the s [ectral features of minerals, by using the imaging spectrometer, the xetraction, 
identification and mapping of the individial minerals have been made both in China and in 
Australia. 
By using of the Mineral Spectral Absorption Index method, the limestone in the strata of 
Cambrian-Ordovician and Permian period contained calcite and donomite has respectively been 
distinguished clearly, eventhoungh the difference of spectral absorption bands between above 
mentioned two minerals is very small. 
By analysing the intensity of the absorption, the distribution of clay and carbonate minerals 
in Kepin area, Xinjiang, China has been mapped (Fig. 4-3). The distribution of two minerals, 
the clay mineral (A) and the carbonate mineral (Blare shown in the figure.