南方单基站CORS在校内控制测量中的应用

连续运行卫星定位系统(CORS)与传统的GPS定位相比,具有操作简单、成本低、精度高、实时性强、覆盖率广等优点,特别是CORS内网络RTK测量功能的实现,极大地提高了测量工作效率.利用南方CORS系统,获取了校园建设和实习控制点的坐标,并且通过GPS静态定位结果和RTK测量结果对比分析,发现南方单基站CORS获取的平面坐标精度达到了校园控制测量的要求,可为后续学校的操场建设和校内实习测量以及科研项目的外业数据采集提供有力的技术支持.     

南方单基站CORS在校园平面控制网中的应用

为深入了解中国南方单基站CORS系统的工作原理与测量精度,解决测绘及相关专业学生及科研工程项目采用该系统进行外业测量数据采集的问题,在校园测量实习基地,使用南方单基站CORS系统,设计两种不同的作业方案,与静态GPS数据处理的结果进行比对分析。精度统计表明:中国南方单基站CORS系统进行平面点位测量达到了校园控制的精度要求。为后续利用该系统进行校园实习基地平面控制网改造及科研项目外业测量做了有益的尝试和技术准备,具有一定的实用价值和参考意义。     

CORS系统加密控制点在地铁GPS控制网测量中的应用

连续运行参考站系统(CORS)是一个或若干个固定的、连续运行的GNSS参考站,它将尖端科技领域的卫星定位技术和地理信息技术、通信技术、先进的软件开发技术有机地结合在一起,为用户提供全新、透明、可视、实时的测量服务。目前,在我国许多省、市都已经建立了CORS站,其被广泛地应用在多个领域。在城市地铁的修建过程中,市区原有平面控制点往往无法满足地铁GPS控制网布设的要求。文章以杭州地铁某标段作为实验对象,采用CORS系统加密平面控制点,同时分析加密控制点与既有控制点之间的兼容性,然后利用加密控制点进行二维约束平差,论证将CORS系统加密的控制点用于地铁控制网起算点的可行性。     

CORS 系统在农村集体土地所用权确权中的应用

随着全球卫星定位系统GPS技术的飞速发展和应用普及,它在测绘领域中的作用越来越重要。一种新的GPS技术,利用多基站网络RTK技术建立的连续运行卫星定位服务综合系统CORS已成为GPS应用发展的新趋势。为使CORS系统的先进测量手段在农村集体土地确权登记发证项目中得到充分应用,通过实验结合不同规范要求。总结了CORS在界址点测量中的应用,分析了测量精度,并提出了CORS测量的优势。结果表明,使用CORS进行农村集体土地所有权界址点测量可以满足精度要求,并能明显提高工作效率。     

GPS测量在桥梁控制网测设中的应用

GPS相对定位技术已经在测绘、交通、城建、国土资源管理等各个领域得到了广泛的应用。它的平面相对定位精度已经完全能够满足工程的需要。结合GPS定位测的各种优点,将GPS相对定位技术引入桥梁控制网的测量和基础放样,无论对GPS技术本身的发展还是对桥梁测量控制都具有极为重要的意义。主要就GPS技术在桥梁测量控制的应用进行了论述。从GPS基本原理出发,论述了控制网的布设、特别对桥梁控制网设计、选点、布设以及精度分析做了详细的论述。并结合张肃项目大桥GPS控制网控制测量和基础放样的实例,对GPS在桥梁测量控制中的应用进行了分析,得到了GPS相对定位技术完全能够应用于桥梁平面控制网和GPS RTK技术满足桥梁基础放样精度要求的结论。     

GPS在控制测量中的研究与应用

从网形设计原则、勘测选点要求、建立GPS控制网、GPS控制网施测、GPS施测精度控制等方面,阐述了GPS在控制测量中研究与应用.     

GPS控制网设计在水利工程控制测量中的应用分析

在水利工程的建设过程中,工程测量是最重要的工作形式之一,其测量技术方法的选择非常重要。随着测量技术的不断发展,传统的测量技术已经不能够满足水利工程的建设需要,取而代之的是GPS测量技术。在GPS的测量过程中,GPS控制网的设计形态对于提高水利工程测量的精度和质量具有重要的影响。主要介绍了GPS控制网设计的基本原理以及水利工程GPS控制网设计的基本内容,重点分析了GPS控制网设计的网形特点,探讨了其在水利工程测量中的优缺点,希望对相关工作者有所指导和帮助。     

苏州三维GNSS CORS高程精度检测与分析

SZ-GNSS CORS是苏州市重要城市基础设施,其中的高程基准是其重要研究内容。通过选取苏州GNSS控制网中的检测点,对这些检测点分别进行精密水准测量、静态GPS观测和GPS RTK观测,对观测数据进行处理和对比分析。结果表明,SZ-GNSS CORS的精化大地水准面模型效果良好,在一般情况下用GPS水准可以替代普通传统水准测量,能够满足苏州城市建设和信息化建设对高程基准的需求。     

GPS定位在房产测量中的应用

结合房产测量的特点和房产平面控制网的精度要求 ,分析了 GPS定位用于房产测量的可行性 ,认为 GPS测量能满足最高等级房产控制网的要求 ,并提出适宜采用的 GPS房产控制网的布设形式。从房产测量的实际要求出发 ,讨论了各种GPS测量作业模式对房产测量的适用性 ,着重介绍 RTK测量的特点 ,指明该技术在房产测量中的应用前景。最后总结了房产测量采用 GPS技术的的优越性。     

GPS地籍控制网的建立

本文研究的是GPS在地籍控制网中的应用。在地籍控制测量中,GPS技术的运用已比较成熟。针对地籍测量的要求,从经济、精度、时间方面探讨了GPS地籍控制测量的技术问题,提出了切实可行的技术方案。GPS是地籍测绘中的重要技术手段之一。本文讲述了建立GPS地籍控制网的基本步骤。     

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).     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

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.