共查询到19条相似文献,搜索用时 125 毫秒
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Oracle Spatial和ArcSDE是目前比较流行的利用关系型数据库存储和管理空间数据的商用软件。在关系数据库的支持下存储、管理空间数据。首先介绍Oracle Spatial和ArcSDE的数据存储机制,然后对二者应用进行比较研究,最后通过实例说明在实际应用中如何选择这两个软件。 相似文献
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王伟 《电子技术与软件工程》2020,(1):157-158
本文基于对GIS下国土空间数据应用平台设计与实现的研究,首先,阐述国土空间数据应用平台基本内容。然后,给出国土空间数据应用平台总体框架设计措施,包括加强基础设施层设计、加强数据资源层设计等。最后,为在GIS下,更好展开国土空间数据应用平台的设计与实现工作,给出加强信息数据库建设工作、加强数据应用系统建设工作等措施。 相似文献
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《现代电子技术》2018,(8):87-91
为了推进管控贵州省生态保护红线的信息化,采用VMware部署私有云环境,以Oracle和ArcSDE建立生态保护红线空间数据库,基于REST服务,B/S与C/S混合开发构建表现层,支持数据二维和三维显示、查询、在线编辑、地理处理、打印等功能,解决省级生态保护红线空间数据的分布式存储、规范化管理、快速发布及拓展应用等问题。设计方案适合开发周期短、低硬件配置的私有云环境,有效降低建设生态保护红线空间数据监管平台的开发和维护成本。建立生态保护红线云GIS监管平台,将资源开发利用、生态保护等领域信息数据进行高效整合和服务共享,为优化国土空间开发格局、推动生态文明建设提供技术支持。 相似文献
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空间数据存储技术及其应用 总被引:10,自引:1,他引:9
谭念龙 《微电子学与计算机》2002,19(1):15-18
文章介绍了GIS中空间数据礅储的特点,并讨论了传统的空间数据存储技术,和当前较为先进的基于RDBMS,面向对向的空间数据存储技术,以及空间数据仓库等前沿技术,并从数据存储角度介绍了GROW平台的结构和特点,以及在GROW系统中应用的G-A和S-R数据模型及其数据存储技术的特点和实现。 相似文献
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遥感影像数据管理方案探索与实现 总被引:1,自引:1,他引:0
遥感影像数据在军用和民用领域都有着重要的应用,如何有效地管理日益庞大的遥感影像数据既有理论价值,又有实际意义。以传统关系型数据库为基础,从关系型数据库管理系统空间扩展和空间数据引擎中间件两条技术路线出发,分别探索并设计实现了遥感影像数据管理原型系统。 相似文献
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短信作为一种快速发展的增值业务,已广泛提高到行业应用,为了让维护人员在第一时间掌握相关影响网络性能的信息,本文论述了如何通过对短信平台建设,建立运维数据沟通和传递的方法,说明了如何利用AT指令短信modem模块通讯,最后给出了实现本系统的主要部分短信接口的接收与发送程序,以及网管数据库、性能统计数据库、日常管理数据库等数据库之间实现了关联的步骤及应用实例。 相似文献
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阐述办公自动化(OA)系统与管理信息系统之间的集成技术,使整个工作流数据通过OA数据接口与企业现有的MIS系统自动交换数据。以SQL数据库作为后台数据库,通过在notes中调用SQL语句实现二者之间的数据集成,实现了Domino数据库和Sybase/Oracle等关系型数据库的数据信息的交互,使OA系统的协同工作结果能与企业的MIS系统有效的沟通和交换,提高企业的集成工作效率。 相似文献
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A repeaterless undersea cable system spanning 150 km between a shore site and an off-shore floating platform is to be installed early in 1985. The system uses single-mode fibers to carry data at a line rate of 3.088 Mbit/s. Laser transmitters operating at 1.55 μm and p-i-n receivers complete the optical system. This paper discusses system parameters and performance, and both terminal and undersea equipment. 相似文献
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A repeaterless undersea cable system spanning 150 km between a shore site and an off-shore floating platform is to be installed early in 1985. The system uses single-mode fibers to carry data at a line rate of 3.088 Mbit/s. Laser transmitters operating at 1.55 μm and p-i-n receivers complete the optical system. This paper discusses system parameters and performance, and both terminal and undersea equipment. 相似文献
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Compared with the conventional coaxial undersea cable systems, an optical fiber undersea cable system has a great technical and economical advantage. It is also suitable for digital transmission. In this paper, the optical fiber undersea cable technology (including optical fiber cables and repeaters), which is now in the research and development stage in several countries, is reviewed. 相似文献
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A repeaterless undersea lightwave system connects two terrestrial locations separated by the sea without the need for undersea regeneration of the optical signal. To achieve the longest span length possible, the system combines terrestrial terminals containing superior-performance optoelectronic devices with ultrareliable undersea cable technology. The lightwave technology used to achieve cost-effective, long-span repeaterless undersea lightwave systems is discussed. This includes undersea fiber and cable, lasers and receivers, and terminal equipment. The first application of this technology, Taiwan's Tainan to Peng-Hu system, is described. The possibilities for increasing the maximum attainable span length of high-capacity repeaterless undersea systems are examined. Key elements are higher-output transmitters, more sensitive receivers, and improved optical fibers 相似文献
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The Fiberoptic Link Around the Globe (FLAG) cable system is a 10 Gb/s synchronous digital hierarchy (SDH) based undersea fiber optic network. When fully operational, FLAG will connect 12 countries with over 120000 voice channels via 27000 km of mostly undersea cable. FLAG will incorporate a new generation of undersea fiber optic system that uses erbium-doped fiber amplifiers and will be jointly supplied by AT&T Submarine Systems Incorporated (SSI) and KDD-Submarine Cable Systems (SCS) Inc. When completed, FLAG will meet or exceed all relevant international performance standards, have greater reliability and availability than previous systems in the region, and conform to all ISO 9000 quality standards with respect to design, development, production, installation, and service 相似文献
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A digital optical fiber undersea cable system targeted for transatlantic service in 1988 is now under development at Bell Laboratories. The system uses single-mode fibers to carry data at a bit rate of 280 Mbits/s. Using digital speech compression techniques, a total system capacity of over 35 000 two-way voice channels can be realized. With laser transmitters at 1.3 μm, repeater spacings are expected to exceed 35 km. This paper discusses system parameters, repeaters, fiber and cable design, terminal equipment, and system measurements. 相似文献
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传统的有中继的海底光缆传输系统由端站的远程供电设备(PFE)对中继器等有源设备进行供电,而海底光缆网络的远程供电系统更加复杂,为此在介绍了传统海底光缆传输系统的远程供电系统的基本原理后,重点对海底光缆网络的两种远程供电方式——串联和并联供电方式做了分析,分别对其供电效率进行了计算,并做了比较。 相似文献
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The systems and operational requirements, reliability, and cost estimates for several undersea fiber optic cable communications systems of varying capacities, data transmission rates, and link distances are analyzed in detail to highlight relevant design tradeoff parameters. It is shown that systems with a high data rate per fiber are more economical and reliable than low data rate systems with multiple fibers. This study concludes that undersea optic cable systems can soon provide reliable broad-band digital services. 相似文献