Mathematical techniques for paleocurrent analysis: Treatment of directional data     

J. S. Rao  Supriya Sengupta 《Mathematical Geology》1972,4(3):235-248

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A Continuum Theory For Lattice Preferred Orientation     

Neil M. Ribe 《Geophysical Journal International》1989,97(2):199-207

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A least-squares method for determining the best-fit point maximum, great circle, and small circle to nondirectional orientation data     

Neil S. Mancktelow 《Mathematical Geology》1981,13(6):507-521

Given a set of nondirectional orientation data (fold axes, lineations, dip and dip direction of bedding, universal stage readings of crystallographic axes, etc.),the best-fit line (point maximum),plane (great circle),or cone (small circle)can be determined by minimizing the sum of the squares of the angular residuals using a simplex convergence technique. Stereoplots of the angular deviation over the complete lower hemisphere for these distributions may also be generated when consideration of the constraint on the best-fit position is important; for example in comparing different data sets of the same structural element. The routines are available as a FORTRAN coded computer program.  相似文献   

Crystallographic orientations of high-angle grain boundaries in dynamically recrystallized quartz: First results   总被引：1，自引：0，他引：1  

Boriana Kuntcheva  Jrn H. Kruhl  Karsten Kunze 《Tectonophysics》2006,421(3-4):331-346

The crystallography and geometry of high-angle grain boundaries from dynamically recrystallized quartz have been studied. On the basis of combined electron backscatter diffraction and universal stage measurements, the complete crystallographic orientation of the grain boundaries could be calculated. The u-stage rotation of the grain boundaries to a vertical position reveals that they are never curved but always consist of straight segments. Our results show that these segments preferentially occupy rhombohedral, trapezohedral and bipyramidal orientations, i.e., orientations in a  25–50° girdle to the c-axis. A specific, albeit low, number of segments with special crystallographic orientation, with respect to a neighbouring quartz grain, often shows another special orientation with respect to the other neighbouring grain. Preferred combinations of grain boundary orientations related to both neighbouring grains are (i) low-index rhombohedral and high index trapezohedral, (ii) low-index bipyramidal and low-index trapezohedral or high-index rhombohedral, and (iii) low-index trapezohedral and low or high index trapezohedral. In certain cases, such as at triple junctions, the boundaries occupy specific trapezohedral orientations with a constant angle to the c-axis. This argues for energy isotropy of trapezohedral planes with the same angle to the quartz c-axis. In general, good match coincidence site lattice (CSL) orientations are not preferentially occupied so that most of the studied grain boundaries represent general boundaries. The formation of straight segments in special crystallographic orientations indicates the crystallographic control and implies an energy reduction of certain general boundaries.  相似文献   

利用物理方法确定外方位元素的卫星立体摄影测量的精度分析   总被引：3，自引：1，他引：2  

袁枫  张继贤  杨明辉  燕琴  任维春 《测绘科学》2006,31(5):30-31

本文在分析用物理方法确定外方位元素的情况下卫星立体摄影测量的精度影响因素,推导了卫星立体摄影测量的理论精度计算公式,并以SPOT5 HRS立体像对为例,计算了SPOT5 HRS立体测量的理论精度,进行了利用少量地面控制点的立体测量试验。结果证明卫星立体摄影测量的理论精度估算公式是正确的,同时SPOT5 HRS立体测量精度能够满足1∶50000测图的要求。  相似文献   

一种非量测相机近景影像外方位元素解算方法   总被引：2，自引：0，他引：2  

杨立君  刘轩  王嘉平 《测绘科学》2012,(1):17-19

本文提出了一种角椎体法和共线方程法联合解算非量测相机影像外方位元素的方法。工程应用证明该方法求解像片的外方位元素具有计算速度快、收敛性强、计算精度高等优点。  相似文献   

POS定位测姿的系统误差分析及补偿   总被引：1，自引：1，他引：0  

李会娟  唐进进  巩现勇  任凤  赵启龙 《地理空间信息》2012,10(5):11-13,16

在实验的基础上获取了航摄姿态角的分布范围,重点分析了POS系统辅助航空摄影测量时,姿态角的实时变化对外方位元素测定结果的影响以及采用飞行检校场法对其进行系统误差补偿的局限性;提出了采用附加参数法对系统误差进行改正,并将观测值的改正参数和观测值一起作为带权观测值参与平差计算的方法;并通过实例证明了该方法能达到理想的效果。  相似文献   

开放式空间基础信息平台的发展特征与技术内涵     

龚辉  姜挺  江刚武  张锐  贾博 《测绘学报》2012,41(3):0-416

基于测绘和地理信息产业发展背景,针对日益增长的数据融合、实时共享、深度处理和个性化的需求,对数字城市中测绘服务特征进行分析,重点介绍符合云计算模型的开放式计算环境、多路径数据更新、多源数据一体化集成、全尺度城市编码、自适应空间数据处理和动态在线制图等理论、方法与关键技术。在此基础上,研制开发了开放式空间基础信息平台,并成功应用于数字深圳的建设中。  相似文献   

基于VirtuoZo的航测内业DOM生成技术研究     

滕刚  路莹新  孟婷 《东北测绘》2012,(5):196-197,200,202

笔者基于长期从事正射影像图制作的工作经验,以VirtuoZo全数字摄影测量系统制作正射影像图为研究对象,探讨了正射影像图的制作流程,文中关于正射影像图的匹配与编辑等内容凝练了笔者长期的工作实践经验,对于从事相关工作的同行有着一定的参考价值和借鉴意义。  相似文献   

地面几何标定的定向片自检校光束法区域网平差模型     

邹瑜  雷蓉  纪松  范大昭 《测绘工程》2012,21(5):8-12

针对航天线阵传感器,综合镜头光学畸变影响、像元尺寸与焦距的变化影响以及镜头的旋转作用,构建8标定参数的内方位自检校模型;利用定向片内插模型,描述影像的外方位元素变化;建立自检校光束法区域网平差模型,在对模型进行线性化的过程中,引入待标定的定向片外方位元素;利用SPOT5模拟数据对平差模型进行实验验证,结果表明,平差模型能够联合标定内方位自检校参数与外方位元素,标定结果准确。  相似文献