A Study On Remote Sensing Alteration Information Extraction In Vegetation Area

Remote sensing technology has the particular characters of rapid speed, low cost, saving time and working, so it can designate target region for exploring mine quickly, show clearly for ordinary exploring mine methods, reduce working scope, raise work efficiency, speed up finding mine speed greatly, relief the current situation of lacking mineral resources. Remote sensing alteration information extracting work can quickly extract alteration information which is related to mine. Compared with traditional remote sensing geology structure interpreting work, remote sensing alteration information extraction can reflect the advantage of high-speed in remote sensing mine exploring.Extracting remote sensing alteration information has been used widely in mineral exploration and resources potential evaluation, but the remote sensing alteration information which has the Indicative significance for exploring mine is always disturbed by other ground object information, and is restricted by spectral and spatial resolution of remote sensing image, is always showed faintly. It will produce some affect for extracted remote sensing alteration information’s reliability extent and practical application effect, and it will a certain extent astrict remote sensing technology’s ability in exploring mine work. Especially, the vegetation disturbance will be more when remote sensing alteration information is extracted in the area of having much vegetation as Zhejiang province, and the extracting result is worse compared with the uncovered area.For these reasons, this research made how to ease vegetation disturbance effect for remote sensing alteration information extracting as the purpose, under the support of nationwide project of assessment of mineral resources potential, used the frequently-used remote sensing data in practical remote sensing mine exploring work, and carried out the research of easing vegetation disturbance when remote sensing alteration information is extracted in the research area of Sui Chang Zhejiang. At the beginning of research, I investigated the research area on the spot and gathered many rock samples, and researched frequently-used remote sensing alteration information extracting methods and easing vegetation disturbance methods, on the base, an efficiently easing vegetation disturbance of remote sensing alteration information extracting method was suggested. The process of the method is pure vegetation spectrum extracting from the image, analysing the ability against vegetation disturbance of the rock, easing vegetation disturbance and extracing alteration information by SAM. This method can develop the advantage of existing easing vegetation disturbance method, and it can overcome some problems when used them in reality. The experiment was carried out in the research area by the suggested method, and the result showed that thesuggested method can ease vegetation disturbance effect, it let the alteration information can be extracted much better. In addition, being aimed at the condition in practical work that the working area is big, the remote sensing data’s quantity which must be processed is large, the time is limit, and there is vegetation disturbance. On the base of researching frequently-used three kinds of remote sensing alteration information extracting methods, at the same time thought the effect for them produced by vegetation disturbance, a method of remote sensing alteration information extracting was advanced which has relatively high-speed and is suited for using in vegetation disturbance area. The experiment result showed that extracting OH-information by ASTER(5+7)/6or ASTER(7/6)*(4/6), and Fe3+information by ASTER2/1or ASTER(4/3)+(2/1), would be little disturbed by vegetation disturbance, and the method can reach the purpose of quickly and correctly extracting the remote sensing alteration information in vegetation disturbance area.The research achievements advanced in this research can provide a certain reference for exploring minerals and resource potential evaluation project in vegetation area as Zhejiang province in nationwide from now on, and can serve practical mine exploring work.