【作者】 朱骏；

【导师】 黄敬峰； 张登荣；

【作者基本信息】 浙江大学 ， 地图学与地理信息系统， 2012， 博士

【摘要】 遥感技术凭借其自身独有的速度快、成本低、省时省力等特点,可以快速的圈定找矿靶区,为常规找矿方法指明方向,缩小工作范围,提高工作效率,大大加快找矿速度,缓解矿产资源紧缺的现状。遥感蚀变信息提取工作能够快速提取与成矿有关的蚀变信息,相对传统遥感地质构造解译工作,更能展现遥感找矿快速的优势。尽管遥感蚀变信息提取在矿产勘查及资源潜力评价中的应用已十分广泛,然而,对找矿有指示意义的遥感蚀变信息,常常由于受其它地物(如土壤和植被等)信息的干扰,加之受遥感图像的波谱分辨率和空间分辨率的制约,往往表现很微弱。这些对提取出的遥感蚀变信息的可信度、实际应用效果会产生一些影响,一定程度上限制了遥感技术在地质找矿工作中更好的发挥作用。尤其在像浙江省这样的植被覆盖较多的地区开展遥感蚀变信息提取面临的植被干扰较多,提取效果往往不如岩石裸露干扰较小的地区。鉴于此,本研究以如何减轻植被干扰对遥感蚀变信息提取的影响为出发点,在全国矿产资源潜力评价项目的支持下,应用实际遥感找矿工作中常用遥感数据,在浙江省遂昌治岭头银坑山研究区,进行抗植被干扰遥感蚀变信息提取方法研究。在前期开展研究区实地考察大量岩石采样的基础上,通过研究目前常用遥感蚀变信息提取方法和消除植被干扰影响方法,提出一个改进的有效减轻植被干扰影响的遥感蚀变信息提取方法。该方法的核心思想是,影像“纯”植被光谱提取+岩石抗植被干扰能力分析+植被影响消弱+SAM提取蚀变信息。它能较传统植被掩膜法“主动”消弱植被干扰影响,同时又克服了传统混合像元分解补偿置换法操作复杂,不利于在实际工作中开展的缺点。应用提出的方法在研究区开展实验,结果表明本研究提出的方法能够起到减轻植被干扰影响的作用,使得蚀变信息能更好的被提取出来。另外,针对实际工作中,时常面临工作区范围大,涉及遥感影像景数多,时间紧,工作区又存在植被干扰影响的情况,在研究分析和比较常用三大遥感蚀变信息提取方法的基础上,并结合考虑植被干扰对它们的影响,提出了一种适合在植被干扰区快速开展遥感蚀变信息提取的方法。通过研究区实验表明,采用ASTER(5+7)/6或ASTER(7/6)*(4/6)提取羟基蚀变,采用ASTER2/1或ASTER(4/3)+(2/1)提取铁染蚀变,受植被干扰影响相对较小,能够达到既快速又相对准确的提取出植被干扰区遥感蚀变信息的目的。本研究的成果能够对今后在全国类似浙江省这样的植被覆盖区域开展矿产调查、资源潜力评价项目的遥感蚀变信息提取工作提供一定的借鉴,为实际找矿工作服务。更多还原

【Abstract】 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.更多还原