Using three-dimensional discrete spherical Fourier descriptors based on surface curvature voxels for pollen particle recognition     

谢永华  Michael OhEigeartaigh 《海洋学报(英文版)》2010,29(11)

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Developing the tools for geological shape analysis,with regional‐ to local‐scale examples from the Kalgoorlie Terrane of Western Australia     

S. J. Gardoll  D. I. Groves  C. M. Knox-Robinson  G. Y. Yun  N. Elliott 《Australian Journal of Earth Sciences》2013,60(5):943-953

Geological map data are often underused in mineral‐exploration programs, which rely increasingly on regolith geochemistry and geophysical and other remotely sensed data to generate exploration targets. However, solid geology maps, which are progressively being upgraded due to improved interpretations of superior, remotely sensed images and airborne geophysical data, can be useful in targeting specific types of mineral deposits, which formed late in the evolutionary history of the host terrane. In such terranes, the present map geometry is essentially the same as that at the time of deposit formation. This is the case for orogenic lode‐gold deposits, which commonly show predictable structural controls and/or structural geometry. Thus, the shape of a rock body, or combinations of structures and rock bodies, may provide an important guide to the exploration potential for orogenic lode‐gold deposits. However, until recently, there has been a dearth of techniques to quantify the various properties of shape, and hence test the potential of the two‐dimensional shape of geological bodies in map view as an exploration tool. Integrating techniques from the field of pattern recognition with a modern Geographical Information System (GIS) can provide the shape‐analysis tools required to investigate the geometries of geological shapes. Two‐dimensional shape analysis is now possible through the calculation of several shape metrics including, but not restricted to, aspect ratio, blockiness, elongation, compactness, complexity, roundness, spreadness and squareness. Methods are developed for describing the geometries of rock units about mineral deposits, or any geological features, at any scale, which for the first time makes it possible to compare shapes. These shape‐analysis techniques are tested using orogenic lode‐gold deposits, particularly those in the Kalgoorlie Terrane of the highly auriferous Late Archaean Norseman‐Wiluna Belt of Western Australia. On a global scale, shape analysis indicates that those greenstone belts whose volcanic rock sequences have high elongation and relative low roundness, complexity and aspect ratio (e.g. Kalgoorlie Terrane) are likely to be the most richly endowed in gold. On a more local scale, characteristics of the shape of geological features around the Golden Mile deposit are calculated and used to test the likelihood of occurrence of gold deposits with similar geometry elsewhere in the Kalgoorlie Terrane. The area with the most closely matching shape, on the basis of a 2 km clipping‐circle radius, chosen on the basis of available proximity‐analysis data, corresponds to the recently discovered Ghost Crab deposit, illustrating the potential of the shape analysis methodology in mineral exploration. Shape analysis is, at least in part, scale dependent, due to the inherent problem of being able to define rock boundaries more precisely in units that have strong geophysical signatures than those with weak signatures in poorly exposed terranes. Overcoming this problem is a challenge to the application of this methodology.  相似文献   

基于模糊集分析的土壤质量指标高光谱反演   总被引：1，自引：0，他引：1  

李希灿  王静  李玉环  王芳  赵杰 《地理与地理信息科学》2008,24(4)

通过对横山县84个土样350~2 500 nm波段的光谱曲线分析,进行土壤质量12项指标的光谱反演。为获得有效光谱反演指标,利用单相关分析方法计算土壤质量指标与光谱反射率的相关系数并绘制相关系数曲线,根据极大相关性选择最佳波段作为光谱反演指标;剔除异常样本后,利用模糊识别理论建立土壤质量指标反演模型,通过优化得到模型的最佳参数。土壤质量12项指标光谱反演模型的平均检验误差均小于15%,说明模型的精度较高。  相似文献   

Discrimination of Soils and Assessment of Soil Fertility Using Information from an Ion Selective Electrodes Array and Artificial Neural Networks          下载免费PDF全文

Aitor Mimendia  Juan M. Gutiérrez  Josep M. Alcañiz  Manel del Valle 《洁净——土壤、空气、水》2014,42(12):1808-1815

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基于视觉的水雷目标识别方法研究     

苗锡奎  朱枫  许以军  吴清潇  郝颖明  任申真 《海洋工程》2012,30(4):154-160

水下目标识别一直是目标识别领域的研究热点,为此,以水雷目标识别为需求背景提出了一种基于视觉的水雷目标识别方法。该方法从水雷目标形状的本质特征出发,根据几何矩的物理意义,结合区域特征和边界特征构造了三个适合于水雷目标形状描述子,采用阈值判决的方法,实现水雷目标的识别。实验结果表明,该方法比基于不变矩的方法识别率更高,具有较好的稳定性,尤其适用于水下特定形状的目标识别和目标受到部分遮挡的情况。其中水下图像处理和特征的定义方法对水下目标识别具有指导和借鉴意义。  相似文献   

基于点云曲线辨识的卫星激光数据预处理算法     

刘雁雨  吴晓平  高皓  刘晓刚 《大地测量与地球动力学》2011,31(1):105-108

针对卫星激光数据处理算法这一难题,分析了COMPASS系统GEO卫星激光观测数据的质量,讨论了反求工程和计算机视觉中的曲线识别与激光观测数据预处理的异同,提出了基于点云曲线辨识的卫星激光数据预处理算法。该算法将卫星激光观测数据预处理视为有序带噪声的空间曲线重建问题,利用COMPASS系统多圈GEO卫星实测数据进行验证。结果表明：该方法与常用算法一致率在85％以上,能够实现激光观测数据的自动处理与满足导航系统的需要。  相似文献   

开封南郊垃圾场地下水质量的熵权属性识别评价          下载免费PDF全文

王鼐  董维红  张岩  郝敬辉 《水文地质工程地质》2012,39(2):94-99

针对地下水质量评价中综合评价法的不足,应用信息熵计算评价指标的权重,并充分利用有序分隔概念,建立了基于熵权的属性识别模型。选择TDS、COD、总Fe、总Mn、Cl-、SO42-、NO2-、F-作为评价指标,运用基于熵权的属性识别法对开封南郊垃圾场浅层地下水进行地下水质量评价。评价结果表明,基于熵权的属性识别法所得的评价结果水质明显优于综合评价法所得的结果;研究区内各样本的评价指标中,SO42-和NO2-的权重最大,Cl-、COD、总Fe和F-的权重次之,TDS和总Mn的权重最小;Ⅰ类、Ⅱ类、Ⅲ类、Ⅳ类和Ⅴ类水在研究区内的分布面积所占比例分别为1.7%、2.5%、26.7%、12.2%和56.9%;浅层地下水质的空间分布在研究区域内具有一定的规律,以靠近垃圾场的L01井和G54井为中心水质最差,为Ⅴ类水,以此为中心向外扩展,水质逐渐好转,依次分布Ⅳ类水和Ⅲ类水。Ⅲ类水的分布向研究区的东部和北部偏移,而在研究区的南部多分布Ⅰ类和Ⅱ类水,水质优良。  相似文献   

一种机载雷达点云数据的快速分类方法   总被引：1，自引：0，他引：1  

李慧盈  李文辉  陈圣波 《吉林大学学报(地球科学版)》2010,40(5):1205-1210

机载激光雷达扫描技术可以以点云形式快速获取地形表面高精度三维信息。基于激光雷达扫描数据及建筑物本身的拓扑信息就可以对建筑物进行精确的重建,而重建中最关键的技术是对点云数据进行分类,进而进行地物识别。对大规模三维点云数据进行快速分类,提出一种采用区域分割结合基于最小二乘平差的多项式拟合方法,将大量离散的三维点云分割后进行多项式拟合,并将二维数据分类转化为一维数据分类。在分类的基础上,将建筑物几何规则作为约束条件提取了房屋边缘。实验分析表明,该方法既能去除多余噪声,又能有效保留特征点,分类的总误差率低于3%。  相似文献   

Polycyclic aromatic hydrocarbons in coastal sediments of southwest Taiwan: An appraisal of diagnostic ratios in source recognition   总被引：1，自引：0，他引：1  

Jheng-Jie Jiang  Meng-Der Fang  James T. Liu 《Marine pollution bulletin》2009,58(5):752-12

Fifty-seven surface sediment samples were collected from the coast of southwest Taiwan and analyzed for polycyclic aromatic hydrocarbons (PAHs). Concentrations of total PAHs (28 PAH compounds) ranged from 15 to 907 ng g⁻¹ dry weight. Diagnostic ratios showed that PAHs in the sediments of the Gaoping estuary were predominantly of petroleum origin, whereas sediments from the Kaohsiung coast contained principally combustion-derived PAHs. Principal component analysis indicated that emissions from automobiles and coal burning were the main sources of combustion-derived PAHs. The relatively high ratios of perylene/penta-aromatic PAH isomers in sediments from the Tainan coast and some off-shore stations on the Kaohsiung coast suggest a significant diagenetic PAH contribution. The study shows that certain diagnostic ratios are useful and sensitive in delineating the distribution of PAHs from specific sources in southwest Taiwan. The phenanthrene/anthracene ratio is a better indicator than the methylphenanthrenes/phenanthrene ratio for tracing petrogenic PAHs, and the benzo(a)anthracene/chrysene and indeno(1,2,3-c,d)pyrene/benzo(g,h,i)perylene ratios are more specific than the benzo(a)pyrene/benzo(e)pyrene and benzo(b)fluoranthcene/benzo(k)fluoranthcene ratios in distinguishing PAHs from various pyrogenic sources.  相似文献   

城市复杂道路网的Stroke生成方法   总被引：2，自引：0，他引：2  

栾学晨  杨必胜 《地理与地理信息科学》2009,25(1)

传统连接stroke的方法在处理表达较为详细的城市道路网数据时,会产生双行道分离和环岛处截断等错误.为能够在城市复杂道路网中正确生成stroke,针对道路网中的双行道和道路交叉口模式提出一种新的stroke生成方法.该方法采用道路街区几何形态分析、基于连通关系的层次聚类等算法自动识别出道路网中的双行道和道路交叉口模式,并使用穷举stroke配对组合算法连接截断的stroke,从而保证stroke的连续性.以武汉市NAVIN-FOTM导航电子地图数据为例验证该方法的实用性,生成的stroke符合stroke感知归组原则中平滑连贯的要求.  相似文献