分维变点法在遥感蚀变异常提取中的应用

发布时间：2018-05-20 06:23

本文选题：分维变点法(FDCPM) + 遥感蚀变异常　；参考：《国土资源遥感》2017年03期

【摘要】：从遥感蚀变异常主分量图像中提取异常信息,目前主要基于数据的正态分布特征,并未考虑地质异常的非线性特征。针对此问题,提出了分维变点提取算法(fractal dimension-change point method,FDCPM)。首先利用分形模型计算蚀变异常的自相似性参数值,再采用变点模型计算蚀变异常的突变性参数值,然后确定蚀变异常临界阈值,达到有效区分地质背景和蚀变异常的目的。以甘肃北山方山口地区为研究区,对识别的ASTER蚀变异常进行测试和验证,并对其提取精度进行初步评价和比较。结果表明:对于实验中的褐铁矿、绢云母和绿泥石3种蚀变矿物来说,分维变点法的总体提取精度略高于门限化方法。利用分维变点法提取3种蚀变矿物的正确率均超过83%,且遥感蚀变异常的分布与化探及重砂异常有较高的吻合度,已知金属矿(化)点也几乎都落在遥感蚀变异常区内或其边缘,表明分维变点法行之有效,可作为今后划分地质背景和蚀变异常的方法之一。
[Abstract]:The extraction of abnormal information from the principal component images of remote sensing alteration anomalies is mainly based on the normal distribution characteristics of the data, and the nonlinear features of geological anomalies are not considered. In order to solve this problem, fractal dimension-change point method FDCPM algorithm is proposed. First, the fractal model is used to calculate the self-similarity parameter value of the alteration anomaly, then the catastrophe parameter value of the alteration anomaly is calculated by using the change point model, and then the critical threshold of the alteration anomaly is determined, so that the geological background and the alteration anomaly can be effectively distinguished. Taking the Fangshankou area of Beishan Gansu as the study area, the identified ASTER alteration anomaly was tested and verified, and its extraction accuracy was preliminarily evaluated and compared. The results show that the total extraction accuracy of the fractal point method is slightly higher than that of the threshold method for the limonite, sericite and chlorite alteration minerals in the experiment. The correct rate of extracting three kinds of altered minerals by fractal point method is more than 83%, and the distribution of remote sensing alteration anomaly is in good agreement with geochemical exploration and heavy sand anomaly, and the known metal ore (mineralization) points almost all fall in remote sensing alteration anomaly area or its edge. The results show that the fractal point method is effective and can be used as one of the methods for dividing geological background and alteration anomaly in the future.
【作者单位】：中国地质调查局西安地质调查中心;长安大学地质工程与测绘学院;
【基金】：国家自然科学基金项目“绿泥石矿物近红外光谱吸收谱带的位移机理与控制机制研究”(编号:41502312) 中国地质调查局地质调查项目“天山—北山成矿带那拉提-营毛沱地区地质矿产调查”(编号:DD20160009) “十二五”国家科技支撑计划项目“岔路口神仙湾铅锌成矿带成矿地质背景及靶区优选”(编号:41502312)共同资助
【分类号】：P627

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