共查询到19条相似文献,搜索用时 246 毫秒
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铝土矿上覆厚度为0.5~9 m的铁矾土(铁帽)的特点使得研究区内铝土矿蚀变信息在一定程度上可以由铁帽信息来表示。在分析区内铝土矿的含矿体系、光谱特征和遥感影像特征的基础上,提出充分利用铝土矿与铁帽信息的相关性,通过提取铁帽信息来间接提取铝土矿蚀变信息。介绍了通过“多元数据分析+比值分析+主成分分析+分类”提取铝土矿蚀变信息的方法,结果表明:利用该方法提取的蚀变信息与已知矿体的吻合率为63%,蚀变信息提取准确度较主成分分析(44.6%)和比值分析(54.7%)有较大幅度提高。该方法能够抑制植被覆盖及第四系等干扰因素的影响,快速有效地提取几内亚金迪亚地区的铝土矿蚀变信息,初步查明区内铝土矿的分布规律,为进一步找矿勘查工作提供了有效的指示信息,这对于找矿勘查成本高的海外勘探区,具有重要的现实意义。 相似文献
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针对工作区(辽东-吉南)植被覆盖率高,河流水体及冲积物等干扰信息多的特点,本文采用比值法、主成分分析法和光谱角制图法相结合,进行大面积遥感矿化蚀变异常信息的提取;在矿化信息分割过程中,引入面向对象的思想,基于实地考察的蚀变信息提取模型,结合矿点、地质构造和遥感图像光谱特征和色彩等多种信息,对图像波段和像元统一进行因子分析和处理,确立切割阈值,克服了主成分变换后主成分分量物理意义不明确的缺点。本次工作建立起植被覆盖地区的遥感矿化蚀变异常提取的一套有效的技术体系,在遥感应用于找矿具有很强的现实意义。 相似文献
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植被在遥感影像上成像具有复杂性和不确定性,这使得利用遥感技术提取植被信息具有很大的难度。利用数据资源丰富的ETM+影像数据对新疆西天山矿化蚀变区的植被进行提取研究,目的是为进行下一步的矿化蚀变信息提取做准备。为保证在提取植被信息后能较好地保留矿化蚀变信息,在认真分析了植被和矿化蚀变的光谱特征后,提出采用“面向特征的主分量分析+最优密度分割”法,最后得出采用ETM+波段3和波段4组合的方式能够取得较好的效果,该方法具有一定的适用性。 相似文献
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基于SAM与SVM的高光谱遥感蚀变信息提取 总被引:1,自引:0,他引:1
高光谱遥感技术的发展,提高了遥感技术的定量化水平,要求人们从光谱维去理解地物在空间维的变换。提出了一种光谱角匹配技术(Spectral Angle Mapper,SAM)与支持向量机(Support Vector Machine,SVM)相结合的高光谱遥感蚀变信息提取模型,在光谱维提取地表的蚀变信息。鉴于SAM算法仅考虑波谱矢量方向,忽略辐射亮度大小的缺点,利用SVM算法对SAM的提取结果进行二次分类,利用网格搜索法并结合分类精度评估进行参数寻优。通过AVIRIS高光谱数据实验证明,提取的蚀变信息分类精度为78.172 6%,Kappa系数为0.712 5。该模型计算方便,对于解决光谱维的地物分类及相似矿物的蚀变信息提取具有一定的实际意义。 相似文献
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从遥感图象中提取出围岩蚀变信息,一直是资源遥感应用与评价的重点与难点.在光谱一空间匹配滤波的基础上,发展了基于光谱匹配的蚀变信息提取方法.该方法在0-均值空间,以标准光谱数据库中的矿物光谱为参考光谱矢量,根据图象像元与参考光谱矢量的匹配程度,建立滤波检测器,从光谱匹配的角度进行滤波以及合理的阈值化处理,分割出蚀变信息.以新疆东天山某金矿床和西藏冈底斯某铜矿带的ETM^ 数据为例,从图象背景中提取出与各自矿化相关的蚀变信息,部分蚀变组合分布信息与矿床位置吻合,从而反映该方法通用性较好. 相似文献
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植被干扰的消除对于应用TM图象进行蚀变信息提取是非常重要的。本文从矿物,岩石和植被在TM波段内的波谱响应分析入手,选择了TM5和TM1,TM5和TM7,TM4和TM3这三个组合分别来增强含铁矿物(主要是铁氧化物),含羟基矿物和碳酸盐矿物及植被信息。通过对比值,比值合成以及主成分分析等方法的比较,提出了一种适于中等植被覆盖区蚀变信息提取的新方法,即基于主成分分析的植被掩模和模式滤波相结合的方法。此方法在试验区进行蚀变信息提取中取得良好效果,它不仅识别出了与地表金矿化区一致的蚀变矿物富集区,而且对土石矿的一些矿脉也有较好反映。 相似文献
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Jianwen Ma Vern Singhroy Huadong Guo Changlin Wang Ge Chen 《International journal of remote sensing》2013,34(17):3323-3337
In order to accelerate the reconnaissance of mineral resources in Xingjiang Uygur Autonomous Region of China, multispectral Thematic Mapper (TM) data were used to delineate hydrothermal alteration related to polymetallic mineralization. In addition to the use of commercial image processing packages, new image processing software based on geological environment and spectral information have been developed. The Gram-Schmidt Orthogonal Projection (GSOP) method used in linear algebra for signal processing was adopted for our study. The kernel part of the algorithm is that the GSOP uses least mean square deviation of mathematical expectation in linear vector space (Hilbert space). In a vector space, one base axis is established and other transitional vectors are inputted to evaluate the effectiveness of GSOP. Satisfactory results have been achieved by applying this method to differentiate hydrothermal alterations in the Kangxiwa area of the Kunlun mountains, western China. The red colour in the image shows Pb-Zn-Cu-Au-Ag polymetallic mineralization zones, which were confirmed by field investigations and sample analyses in 1998. 相似文献
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基于多维情感语义空间的色彩表征方法 总被引:3,自引:0,他引:3
针对色彩与情感映射模型复杂且难以实现的问题。提出一种利用多维语义空间表征色彩的方法.首先从信息论角度出发,依据Lebesgue测度原理阐明了色彩情感语义信息的度量特征;然后利用语义分析法建立了表征RGB色彩的多维语义空间,结合Euclid空间探讨了RGB色彩与多维语义空间映射特点,并提出消除由语义维度和粒度冲突而引起的语义空洞的算法;最后以一个色彩设计系统对其进行应用验证.实验结果表明,该算法能够在不同维度与粒度层上实现色彩空间与情感语义空间的复杂映射. 相似文献
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M. Naresh Kumar M. V. R. Seshasai K. S. Vara Prasad V. Kamala K. V. Ramana R. S. Dwivedi 《International journal of remote sensing》2013,34(14):4041-4053
The reflectance spectrum of species in a hyperspectral data can be modelled as an n-dimensional vector. A spectral angle mapper (SAM) computes the angle between the vectors that is used to discriminate the species. Spectral information divergence (SID) models the data as a probability distribution so that the spectral variability between the bands can be extracted using stochastic measures. The hybrid approach of the SAM and SID is found to be a better discriminator than the SAM or SID on their own. The spectral correlation angle (SCA) is computed as a cosine of the angle of the Pearsonian correlation coefficient between the vectors. The SCA is a better measure than the SAM as it considers only standardized values of the vector rather than the absolute values of the vector. In the present article, we propose a new hybrid measure based on the SCA and the SID. The proposed method has been compared with the hybrid approach of the SID and SAM for discriminating species belonging to Vigna genus using measures such as relative spectral discriminatory power, relative discriminatory probability and relative discriminatory entropy in different spectral regions. Experimental results using the laboratory spectra show that the proposed method gives higher relative discriminatory power in the 400–700 nm spectral region. 相似文献
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A precise method for accurately tracking dim-small targets, based on spectral fingerprint is proposed where traditional full color tracking seems impossible. A fingerprint model is presented to adequately extract spectral features. By creating a multidimensional feature space and extending the limited RGB information to the hyperspectral information, the improved precise tracking model based on a nonparametric kernel density estimator is built using the probability histogram of spectral features. A layered particle filter algorithm for spectral tracking is presented to avoid the object jumping abruptly. Finally, experiments are conducted that show that the tracking algorithm with spectral fingerprint features is accurate, fast, and robust. It meets the needs of dim-small target tracking adequately. 相似文献