共查询到20条相似文献，搜索用时 156 毫秒
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针对广东省已建成的铀矿钻孔数据库系统在工程地质分析、解释全过程方面未能实现数字化可视化分析的空间管理问题,该文提出以地理信息系统平台为基础,根据铀矿成矿、勘探、储量估算的特点,建设三维铀矿建模地理信息系统平台。实现了铀矿勘查数据库建库、矿区地质成图、矿体圈定、矿床地质建模、品位估计和储量估算等全过程的数字化、可视化的查询与分析;结合地表建模及可叠加遥感技术,实现了地上地下全方位矿区立体建模。实践表明,利用该系统重构的地质矿体真实可靠,与传统解释方法基本一致,符合铀矿成矿原理。 相似文献
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桥梁控制网的精度估算 总被引：3，自引：0，他引：3
文章对桥梁控制网的精度估算方法进行探讨，提出了利用桥墩定位和跨距的精度作为控制网设计的精度准则，并给出考虑原始数据误差影响的精度估算数学模型，这对桥梁控制网的设计，精度分析以及铁路测量规则中有关桥梁控制网精度估算方法的制定，都有参考作用。 相似文献
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GPS控制网优化设计与数据处理 总被引：1，自引：0，他引：1
论述了GPS控制网精度估算、可靠性分析、敏感度分析、优化设计、坐标系统转换、不同坐标系转换中的误差表示及其换算等方面的理论与方法,介绍了GPS网条件检核、三维平差、二维平差、高程拟合等GPS数据处理过程中所要注意的问题及其解决方法。 相似文献
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根据测量平差间接平差方法,对测量控制网的精度估算原理、控制网观测方程的建立、观测值权的确定方法展开了讨论。结合徐州市云龙湖风景名胜区1∶5 000测图控制网建设的具体工程实例,给出了GPS平面控制网和水准网的布设方法和基于Matlab的控制网精度估算的实现算法,为控制网网型的优化设计提供了可能。 相似文献
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讨论了电子地图支持下的控制网设计,将地理环境信息、网优化设计理论、技术设计规程相融合,介绍了"大地网技术设计系统"的基本功能,从技术角度探讨了其软件开发的4个关键技术.此类软件的开发和应用,可以代替测量规范中有关技术设计部分的操作;这也是大地测量生产中软件开发向可视化和支持质量控制发展的方向. 相似文献
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讨论了电子地图支持下的控制网设计，将地理环境信息、网优化设计理论、技术设计规程相融合，介绍了“大地网技术设计系统”的基本功能，从技术角度探讨了其软件开发的4个关键技术。此类软件的开发和应用，可以代替测量规范中有关技术设计部分的操作；这也是大地测量生产中软件开发向可视化和支持质量控制发展的方向。 相似文献
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范先铮 《测绘与空间地理信息》2021,44(5):196-198,204
由于高铁精测网复测示意图作图效率低,本文提出了基于AutoCAD平台下ObjectARX工具的高铁精测网复测智能绘制方法,对各类点与施测线路图形实体对象建立、高铁精测网复测文件数据图形转换、图形实体碰撞自动识别进行了研究,解决了高铁精测网复测图形表现、读取高铁精测网复测数据、避免可视化成图压线等问题,实现了为用户提供直观的点状要素与线状要素等可视化信息,具有较大实用价值. 相似文献
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在研究公路交通地理信息系统（GIS—T）建设现状的基础上,提出了基于GIS组件SuperMap Objects的公路工程地理信息平台。从公路工程规划、设计、建设和管理过程中所涉及的各种数据和资料及现实需求出发,探讨了平台系统总体结构、数据库设计和系统功能设计,研究了系统开发中数据的组织与动态分段等关键技术。以广东省公路工程地理信息平台为实例,介绍了系统的功能和应用,实践了文中提出的技术和方法。 相似文献
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在研究公路交通地理信息系统(GIS-T)建设现状的基础上,提出了基于GIS组件SuperMap Objects的公路工程地理信息平台。从公路工程规划、设计、建设和管理过程中所涉及的各种数据和资料及现实需求出发,探讨了平台系统总体结构、数据库设计和系统功能设计,研究了系统开发中数据的组织与动态分段等关键技术。以广东省公路工程地理信息平台为实例,介绍了系统的功能和应用,实践了文中提出的技术和方法。 相似文献
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Galileo系统的特点分析 总被引：3，自引：2，他引：3
随着“全球定位系统(GPS)”在各个领域应用的不断深入，欧盟也认识到了拥有自身卫星导航系统的重要性，经过长时间的协调和争论，终于在2002年3月26日由欧盟各国交通部长正式签署协议开始建设欧洲自己的卫星无线电导航系统-Galileo系统。我国在Galileo系统谈判阶段就开始与欧盟接触，寻求未来在Galileo系统上与欧洲相关的技术协作和系统共享，目前已经达成初步协议，并于2003年9月18日在北京成立了“中欧卫星导航系统培训与合作中心”。对该系统的总体设计思路、系统特点以及相关技术进行了分析。 相似文献
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The short-term prediction of Earth rotation parameters (ERP) (length-of-day and polar motion) is studied up to 10 days by means of ANFIS (adaptive network based fuzzy inference system). The prediction is then extended to 40 days into the future by using the formerly predicted values as input data. The ERP C04 time series with daily values from the International Earth Rotation Service (IERS) serve as the data base. Well-known effects in the ERP series, such as the impact of the tides of the solid Earth and the oceans or seasonal variations of the atmosphere, were removed a priori from the C04 series. The residual series were used for both training and validation of the network. Different network architectures are discussed and compared in order to optimize the network solution. The results of the prediction are analyzed and compared with those of other methods. Short-term ERP values predicted by ANFIS show root-mean-square errors which are equal to or even lower than those from the other considered methods. The presented method is easy to use.Acknowledgments. The presented study was undertaken during a six-month stay of the first author at the DGFI (Deutsches Geodätisches Forschungsinstitut) in Munich. The authors wish to thank the DAAD (German Academic Exchange Service) for its support of this project. The first author would like to express many thanks to Prof. Dr.-Ing. Hermann Drewes and all other administrative and academic staff at the DGFI for providing a very warm welcome which motivated and encouraged him during his study on this project. The cooperation of Dr.-Ing. Katja Heine (TU Cottbus, Germany) is gratefully acknowledged, in particular her hospitality during the two stays of the first author in Cottbus. 相似文献
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P. A. E. Stewart 《The Photogrammetric Record》1986,12(67):5-24
The presence of air and liquid, or two phase flow, in gas turbine oil or fuel systems poses performance analysis problems. Conventional instrumentation is invasive and, by its presence, changes the nature of the flow itself In order to analyse a system comprehensively, a number of non-invasive measurements are preferable. One of the objectives of this project was to determine the feasibility of photogrammetry for this task. The study has fallen into two parts. The first part which has been completed, and is reported here, concerns an investigation of the problems of applying the photogrammetric technique by using stereoscopic images of two phase flow structures and measuring them using calibrated equipment. This has been successful and valuable experience has been gained. Images have been analysed and scientific data obtained. However the nature of the flow is transient and a series of isolated images do not describe the processes and may lead to ambiguities. For this reason, the opportunity provided by John Hadland Ltd. to use the Spin Physics SP2000 High Speed Video system in August, 1984 was taken; using calibrated twin video cameras, the first high speed digital video photogrammetric system was thus operated. Accuracies in three dimensions of better than 0.5 mm are claimed for this experimental work at 1000 fiames s-I. 相似文献
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The following topics are discussed in this paper: the geocentric coordinate system and its different realizations used in geodetic practice; the definition of a horizontal geodetic datum (reference ellipsoid) and its positioning and orientation with respect to the geocentric coordinate system; positions on a horizontal datum and errors inherent in the process of positioning; and distortions of geodetic networks referred to a horizontal datum. The problem of determining transformation parameters between a horizontal datum and the geocentric coordinate system from known positions is then analysed. It is often found necessary to transform positions from one horizontal datum to another. These transformations are normally accomplished through the geocentric coordinate system and they include the transformation parameters of the two datums as well as the representation of the respective network distortions. Problems encountered in putting these transformations together are pointed out. 相似文献
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一项工程的开始首先要选择正确的坐标系统,坐标系统选择得是否合适对整个工程质量至关重要,因此,我们要把坐标系统的选择作为首要重点工作对待。对于项目工程而言,建立独立坐标系统的目的是使投影长度变形控制在允许的误差范围之内。高斯-克吕格投影所建立的平面坐标系,或简称高斯平面直角坐标系,是大地测量、城市测量、普通测量、各种工程测量和地图制图中广泛采用的一种平面直角坐标系。本文根据正形投影的长度综合形变公式,推导出最佳方法。理论和实践均表明,该方法简洁、有效,能较好地抑制投影过程中的边长形变。本文就工程实践,介绍一种选取方法,研究建立城市抵偿坐标系解决变形问题。 相似文献