动态分段技术在北京水务普查中的应用研究   总被引：1，自引：0，他引：1  

王淼 《北京测绘》2012,(3):19-21

动态分段技术是一种新的线性特征的动态分析、显示和绘图技术。本文对动态分段数据模型进行探讨,提出一套基于动态分段技术构建河流数据模型的实现方法,它解决了传统数据及属性管理和分析中一对多、线性度量以及分段数据等难题,为水务普查成果数据的管理和分析提供了一定借鉴意义。  相似文献   

Tsallis熵和改进CV模型的海面溢油SAR图像分割   总被引：2，自引：1，他引：1  

吴一全  吉玚  沈毅  张宇飞 《遥感学报》2012,16(4):678-690

为了解决海洋表面溢油监测中合成孔径雷达(SAR)图像分割精度不高的难题,提出一种基于Tsallis熵多阈值分割与改进CV(ChanVese)模型相结合的海面溢油图像分割方法。首先采用基于Tsallis熵的多阈值选取算法对海面溢油图像进行粗分割;然后分别将得到的溢油区域和溢油粗略轮廓作为CV模型的局部区域和初始轮廓,以降低CV模型的场景复杂度及其对初始条件的敏感性。CV模型仅考虑了图像各区域的均值信息而没有考虑图像的局部信息,尽管能够得到渐进型边界图像,但其分割结果存在误差。本文采用了加入移动因子的改进CV模型降低分割误差,提高收敛速度。实验结果表明,提出的海面溢油SAR图像分割方法具有分割边界定位准确、运行高效和无需设置初始条件等优点。  相似文献   

多尺度边缘动态规划立体匹配算法   总被引：1，自引：0，他引：1  

肖俊  夏林元  林丽群  肖洲 《测绘科学》2012,(1):142-144

目前大多数立体匹配方法都是基于像素处理,而以面向对象的方式进行立体匹配则更加符合人类视觉习惯。该文提出一种面向对象的多尺度递进的立体匹配算法,实现由粗到细的快速立体匹配。首先对参考图进行粗分割获取目标对象,然后针对目标区域采用边缘线动态规划的方法获取视差,再根据精度需求进一步判断该目标是否需要细分以获取更加精细的视差,最后得到有效的视差图。实验证明,这种方法以目标区域为对象避免了从像素级逐一运算,不仅使处理速度加快,而且还能保持有效精度。  相似文献   

高分辨率遥感影像的全变分分割模型     

张倩  黄昕  张良培 《测绘科学》2012,37(5):81-83

由于全变分(Total Variation,TV)模型具有较好的去噪、增强和扩散等功能,在过去的几十年中,TV模型在图像去噪、增强和超分辨率重建等方面得到了深入研究与广泛应用。鉴于TV模型的理论与分割理论具有一致性,因此本文主要研究TV模型用于高分辨率遥感影像的分割,并针对地物多尺度特征,提出了自适应的TV(ATV)模型;且与目前流行的面向对象的影像分析软件eCognition中的FNEA分割方法进行了比较。实验采用2幅高分辨率遥感影像,同时采用了面向对象的分割和分类评价,得出各方法各具优缺点的结论。  相似文献   

China's Urban Transition     

《The Journal of geography》2012,111(3):394-403

Abstract

Urbanization in China is proceeding rapidly in step with population growth and a structural shift in employment from farming to industrial, commercial, and service jobs. Two additional causal factors drive the recent rapid urbanization. First, policies related to migration and household registration have been relaxed to allow more farmers to move to cities as transient workers. Second, economic reforms have resulted in new rules and regulations that promote foreign investment and trade activities in coastal areas. The results are seen in the emergence of four extended metropolitan regions in coastal areas (Shanghai-Nanjing, Beijing-Tianjin-Tangshan, Canton-Hong Kong, and Dalian-Shenyang). These metro regions have markedly different demographic, employment, migration, and foreign investment patterns from other parts of China. Such patterns presage the likely future form of China's urbanization as the country enters a period of accelerated urbanization.  相似文献   

Tropical Cyclone Cloud Image Segmentation by the B-Spline Histogram with Multi-Scale Transforms          下载免费PDF全文

ZHANG Changjiang  WANG Xiaodong  DUANMU Chunjiang 《Acta Meteorologica Sinica》2010,24(1):78-94

An efficient tropical cyclone(TC) cloud image segmentation method is proposed by combining the curvelet transform,the cubic B-Spline curve,and the continuous wavelet transform.In order to enhance the global and local contrast of the original TC cloud image,a second-generation discrete curvelet transform is implemented for the original TC cloud image.Based on our prior work,the low frequency components are enhanced by using an incomplete Beta transform and the genetic algorithm in the curvelet domain. The...  相似文献   

刚果(金)铜-钴矿床地质特征及分布规律   总被引：5，自引：0，他引：5  

杜菊民 《地质与勘探》2010,46(1):165-174

刚果(金)的铜矿带以赋存于新元古代沉积岩中的铜-钴多金属矿床为特征。根据矿体赋存地层的不同,矿带内自下向上共发育6层矿体。最主要的两个层状铜-钴矿体主要赋存于下Roan群Mines亚群(R2)之中,其一位于Kamoto组底部(R2.1),构成下部矿体;另一位于Shales dolomitic组(R2.2)底部,构成上部矿体。第三层矿体呈透镜状赋存于Roan群Mines亚群Kambove组(R2.3)中底部。第四层矿体赋存于Roan群Dipeta亚群Kansuki组(R3.3)内,为局部层状矿化。第五层矿体位于Nguba群Likasi亚群顶部(Ng1.3),为局部的铜多金属矿化。第六层矿体位于Kundelungu群Plateaux亚群中,为次生富集的铜多金属矿化。这些矿床(体)根据矿化特征的不同可以分为层状、次生富集和脉状三个类型,其分布严格受地层控制,并与卢菲莲造山期挤压构造密切相关。层状铜-钴矿床主要分布在由Mines亚群组成的逆冲岩席边缘的山脊部位,而次生富集、脉状矿床从Mines亚群到Kundelungu群都有发育,多出露于逆冲岩席内部的山脊与线性构造的交切部位。  相似文献   

安徽铜山矽卡岩型铜矿床控矿构造及其对矿化的影响     

李大鹏 《地质与勘探》2010,46(6):1051-1060

矽卡岩型金属矿床的形成与构造活动是密切相关的。本文以安徽铜山矽卡岩型铜矿床为研究对象,通过对岩体侵位特征、矽卡岩矿化分带特征、和矿物组合变化规律的研究,系统分析了断裂、褶皱、不整合、接触带等构造活动对本区矽卡岩型铜矿床的成矿控矿意义以及对于矽卡岩矿化的影响。研究表明,构造运动贯穿岩浆上侵、就位、岩浆热液流体活动、接触交代、成矿等整个地质过程;岩浆侵位和矿体的赋存主要受不整合面控制;垂向上矽卡岩矿化分带不同,浅部矿体主要产于石炭-二叠系(C-P)灰岩与燕山期花岗闪长岩体形成的矽卡岩接触带上,而深部矿体则是由于岩浆热液流体的灌入式侵位,发生接触交代、矽卡岩化而成矿的;断裂-接触带共同控矿导致反向矽卡岩矿化分带。  相似文献   

柴达木盆地阿尔金斜坡带构造特征与阿尔金断裂形成时间讨论——以月牙山地区为例   总被引：3，自引：0，他引：3  

刘志宏  王芃  沙茜  万传彪  高军义 《地质学报》2010,84(9):1275-1283

研究区位于柴达木盆地阿尔金斜坡带的中段,跨越柴达木盆地、阿尔金断裂和索尔库里盆地三个构造单元,阿尔金斜坡带总体上表现为大致向南倾斜的斜坡,是一个在三位空间上变化的曲面,其包络面的走向与阿尔金断裂的走向基本一致。阿尔金斜坡带由与阿尔金断裂伴生的轴向近东西、靠近断裂逐渐向其收敛的背斜构成,在阿尔金山前表现为一系列斜列鼻状构造,在空间上呈宽缓的、隆拗相间的有规律性变化,在大部分地段表现为由堆垛式双重构造自北向南的逆冲作用形成的大型背斜的前翼。根据背斜前翼生长地层确定阿尔金断裂自下干柴沟组上段沉积时期(38Ma)开始形成,至今一直处于持续的活动状态。在下干柴沟组上段至上油砂山组沉积时期(38～8.1Ma),断裂的活动强度较小,自狮子沟组沉积开始(8.1Ma),断裂的活动强度明显增大。  相似文献   

Stratigraphy and depositional setting of slurry and contained (reflected) beds in the Marnoso‐arenacea Formation (Langhian‐Serravallian) Northern Apennines,Italy     

PIERRE MUZZI MAGALHAES  ROBERTO TINTERRI 《Sedimentology》2010,57(7):1685-1720

This work presents the stratigraphy and facies analysis of an interval of about 2500 m in the Langhian and Serravallian stratigraphic succession of the foredeep turbidites of the Marnoso‐arenacea Formation. A high‐resolution stratigraphic analysis was performed by measuring seven stratigraphic logs between the Sillaro and Marecchia lines (60 km apart) for a total thickness of about 6700 m. The data suggest that the stratigraphy and depositional setting of the studied interval was influenced by syndepositional structural deformations. The studied stratigraphic succession has been subdivided into five informal stratigraphic units on the basis of how structurally controlled topographic highs and depocentres, a consequence of thrust propagation, change over time. These physiographic changes of the foredeep basin have also been reconstructed through the progressive appearance and disappearance of thrust‐related mass‐transport complexes and of five bed types interpreted as being related to structurally controlled basin morphology. Apart from Bouma‐like Type‐4 beds, Type‐1 tripartite beds, characterized by an internal slurry unit, tend to increase especially in structurally controlled stratigraphic units where intrabasinal topographic highs and depocentres with slope changes favour both mud erosion and decelerations. Type‐2 beds, with an internal slump‐type chaotic unit, characterize the basal boundary of structurally controlled stratigraphic units and are interpreted as indicating tectonic uplift. Type‐3 beds are contained‐reflected beds that indicate different degrees of basin confinement, while Type‐5 are thin and fine‐grained beds deposited by dilute reflected turbulent flows able to rise up the topographic highs. The vertical and lateral distribution of these beds has been used to understand the synsedimentary structural control of the studied stratigraphic succession, represented in the Marnoso‐arenacea Formation by subtle topographic highs and depocentres created by thrust‐propagation folds and emplacements of large mass‐transport complexes.  相似文献