Research On Extraction Alteration Information Of Remote Sensing Based On Spectral Space Data Analysis

In this article, remote sensing data is converted to another visual expression method. In other words, we transform the image space of spectral data into the vector space of it (which is called spectral lattice space or particular space for short). Then, the structural feature of the background, interference factors and alteration anomaly in spectral space are basically analyzed (mainly in the two-dimensional space of spectral data). This article mainly applies two-dimensional correlative color encoding method and Mask technology as to alternation information extraction in Bange-Naqu areas in Tibet.Based on statistical analysis of the characteristics of the value of ETM images, this article uses a variety of remote sensing image processing technology and made the standard remote sensing map of 1/5 ten thousand scale.Combining with existing region geology materials, interpretation keys are set up.In order to offer new basic information to develop geological exploration,it extremely translates the stratum, structure, rock and altered belt in study area.Through systematical analysis about the structural feature of the two-dimensional spectral space of remote sensing image of different natural landscape areas, classification system of two-dimensional scatter image is proposed on physical and statistical significance. On the base of the classification system, preliminary solution is given for the extraction of alteration information in different natural landscape areas, and it affords new technical thinking for extraction of remote sensing alteration information.According to the results which are gained by the analysis of background, interference and anomaly in two-dimensional spectral space structure, second extraction of alteration anomaly is realized by selecting the optimum extraction altered information band combination and using the two-dimension correlative color encoding method, Mask technology and the best density separation method to remove interference information.The realization of second extraction makes the mineral alteration information separated and extracted step by step, and gives direction for ore prospecting in the studied area.Based on regional metallogenetic condition analysis and field geological investigation, the study areas's mineralization prognostic are conducted according to the different geological setting, conditions and environment of ore-forming.A total of 14 forecast areas are delineaed in Daren and Naqu district, including 2 A level forecast area,3 B level and 9 C level. It provides an important scientific basis for the deployment of geological exploration work.