基于VC++的坐标系统转换程序设计与实现

坐标系统转换一直是专业性强且不易解决的问题.根据不同参考椭球和相同参考椭球的坐标系转换原理,论述了利用VC 编制不同坐标系统转换和坐标换带软件编制过程的关键技术、软件功能,利用VC 语言定义了相应的结构体和不同的类,实现了不同参考椭球情况下七参数、四参数的计算过程、不同坐标系统的坐标转换和坐标换带计算程序化,并以某个矿山的实际数据对软件进行了验证.结果表明该系统运行可靠、操作方便、计算结果能满足精度要求.图1,表2,参8.     

方差分量估计在三维七参数坐标转换中的应用

将方差分量估计应用于三维七参数坐标转换模型参数求解,并通过实例计算与传统的解算方法进行精度比较,实验结果表明,将方差分量估计用于三维七参数坐标转换模型参数求解,可有效提高坐标转换的精度.     

两种大转角空间坐标转换模型研究

空间大转角的坐标转换,可以采用由适用于小角度转换的布尔莎模型改进的七参数模型,也可以采用罗德里格矩阵转换法来实现。本研究针对两种方法的原理和适用条件,通过模拟实验和在地铁盾构工程实例中对两种坐标转换模型的解算过程和结果进行分析和比较,得出以下结论:在大旋转角情况下,罗德里格矩阵转换模型作为非迭代模型算法简明,不受旋转角度的限制,易于快速实现,适用于常规精度要求的工程应用;改进的七参数迭代模型,算法严密,精度更高,实现大旋转角坐标转换的过程复杂,适用于高精度要求的研究应用。     

方差分量估计在三维七参数坐标转换中的应用

将方差分量估计应用于三维七参数坐标转换模型参数求解,并通过实例计算与传统的解算方法进行精度比较,实验结果表明,将方差分量估计用于三维七参数坐标转换模型参数求解,可有效提高坐标转换的精度。     

一种新的多区域坐标转换方法

针对同一坐标系下多区域内重合点坐标转换结果不统一,限制测量成果的综合利用问题,根据反距离权重法原理,提出一种多区域的平面坐标转换方法,并采用实际坐标数据进行验证计算。首先给出了进行坐标转换的计算模型,通过分析探究了坐标分布与其转换精度的特殊关系,引入了移动窗口提取区域内坐标,并对重合点的坐标转换参数进行插值计算,最后利用实际数据验证了算法的有效性和可靠性。结果表明：对比直接进行坐标转换的传统算法,引入移动窗口的新的坐标转换方法提高了坐标转换计算的精度,减小了冗余数据对坐标转换结果的影响,保证了多区域中重合点坐标转换结果的唯一性,坐标转换结果在X方向、Y方向的位置误差分别减小了30.45%和20.52%。     

基于相似变换的城市坐标系统转换研究

结合福州城市坐标系统转换的实际问题,探讨适合城市地方平面坐标系到1980西安坐标系的坐标转换模型,推导给出了最小二乘法求解参数公式,并对求解的转换参数进行验算和精度评估.设计开发了组件式坐标转换软件.     

2000坐标系转换模型的试验分析与研究

针对适用于较大区域内进行坐标转换的问题,对2000坐标系转换的四参数模型进行研究.分别采用了三种试验方案进行分析比较,重点描述从1980西安坐标系到2000国家大地坐标系转换的过程及要求,对实验数据的精度进行分析以及不同方案中重合点的参数进行检校.研究结果表明:采用四参数模型转换是可行的,该模型控制点坐标的转换精度可以满足控制点转换精度需求,同时为大地测量坐标系的建设提供一些参考.     

系数加权法在多区域坐标转换中的应用

针对同一坐标系下多区域内重合点坐标转换结果不统一,限制测量成果综合利用问题,根据反距离权重法原理,提出一种多区域的平面坐标转换方法,并采用实际坐标数据进行验证计算。首先给出了进行坐标转换的计算模型,通过分析探究了坐标分布与其转换精度的特殊关系,引入了移动窗口提取区域内坐标,并对重合点的坐标转换参数进行插值计算,最后利用实际数据验证了算法的有效性和可靠性。结果表明:对比直接进行坐标转换的传统算法,引入移动窗口的分区系数加权转换法提高了坐标转换计算的精度,减小了冗余数据对坐标转换结果的影响,保证了多区域中重合点坐标转换结果的唯一性,坐标转换结果在X方向、Y方向的位置误差分别减小了30.45%和20.52%。     

矿区坐标系与西安80坐标系转换的不同方法比较分析

通过对采用四参数和赫尔默特法矿区独立坐标系坐标系转换西安80坐标系方法、精度来分析适用范围,总结坐标转换中的注意事项.     

不同基准坐标系统转换方法的研究

在实际测量工作中,不同的坐标系统测量得到的数据是不同的,必须进行相应的模型转换即坐标转换.笔者通过对国内外转换模型成果的理论分析,提出了解决坐标转换问题的方法,总结了转换参数的求解方法.该论文重点研究了现有坐标系向CGCS2000坐标系进行坐标转换、54坐标和80坐标进行坐标转换的方法.并且编制了相应的坐标转换软件,实现了坐标转换的电算.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.