共查询到20条相似文献，搜索用时 422 毫秒
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基于Silverlight的WebGIS客户端技术与应用试验 总被引：5，自引：0，他引：5
RIA(丰富型互联网应用程序)技术越来越多的应用于WebGIS,满足了人们对高交互性和丰富表现力的需求,现存的WebGIS客户端解决方案主要是Ajax和Flex,其中Ajax交互能力和表现力不够强大,而对Flex的研究多集中在体系结构、功能模块上。本文在对Silverlight分析的基础上,提出将Silverlight应用在WebGIS客户端的技术可行性,特别是研究了利用Silverlight技术来表达地理空间信息的方式,分析了如何在Silverligt中模拟和改进DeepZoom技术,进行地理空间信息的多尺度高细节展现,运用XAML(可扩展应用程序标记语言)、动画技术等,实现地理信息的矢量栅格一体化表达等功能,并集成视频、图片等多媒体信息,提高了地理空间信息的表现力。同时,对进行大数量表达的算法设计和实现处理等性能提升方面也做了研究。最后,由试验验证了在WebGIS客户端应用Silverlight技术的可行性与性能上的优越性。 相似文献
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基于HTML canvas的WebGIS客户端技术研究 总被引：2，自引：0，他引：2
从提供静态媒体发展到能动态地处理多媒体信息是Web应用的发展趋势,HTML canvas元素是HTML 5标准中新增的用于处理图像图形以及动画的新技术。本文讨论了该技术在WebGIS客户端的应用,分析了一种适合HTML canvas的基于JSON的地理信息数据传输格式以及基于HTML canvas元素构建WebGIS浏览器客户端的设计和实现。 相似文献
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本文首先分析了传统WebGIS存在的不足,随后介绍了RIA技术、Silverlight技术和WCF服务,并提出基于Silverlight技术和WCF服务的WebGIS框架。在描述了框架的目标后,较为详细地分析了框架的结构。最后,本文以该框架在财政预算审批空间可视化管理系统中的应用为例,介绍了框架中关键的表示层和WCF服务层的实现过程。 相似文献
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本文首先分析了传统WebGIS存在的不足,随后介绍了RIA技术、Silverlight技术和WCF服务,并提出基于Silverlight技术和WCF服务的WebGIS框架,在描述了框架的目标后,较为详细的分析了框架的结构。最后,本文以该框架在财政预算审批空间可视化管理系统中的应用为例,介绍了框架中关键的表示层和WCF服务层的实现过程。 相似文献
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基于WebGIS定制平台的开发与应用 总被引：1，自引：0，他引：1
基于柔性设计、定制及框架技术,形成应用型WebGIS定制平台的概念及框架,提炼了平台的高柔性、多粒度功能复用、充分可定制三大特点,进行了数据定制与配置、界面定制与配置、功能定制与配置等功能的研究与设计。基于WebGIS定制平台的开发与应用实践证明:该开发模式实现了多个WebGIS应用系统的敏捷开发,较好地支持了数据共享、功能复用与界面的一致性。 相似文献
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针对WebGIS中大规模矢量数据的网络传输问题,提出采用流式传输方式分批次向客户端传输所需数据,从而达到矢量数据在线实时应用的目的。通过研究流式传输机制,建立了适应于矢量数据流式传输的服务框架;按照流式传输的要求,对矢量数据进行分块组织,保证每个批次的要素作为独立的单元传输并在客户端处理;在传输过程中,实时传输协议实现了矢量数据流式传输机制,并参照流媒体文件“边传边播”的模式,设计了矢量数据的封包和解包算法。该方法实现了矢量数据的发送和接收,达到了多次往复传输的目标,且能通过差错控制和压缩加密等手段提高数据传输效率、保证数据传输质量和安全。实验证明,矢量数据的流式传输能降低约一半的数据传输量,有效地提高了传输效率,降低了系统响应时间。 相似文献
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以数字矿山框架为基础,利用虚拟现实、无线传感网、视频监控和产量监控等技术,提出三维动态监管系统关键技术和系统框架,基于统一地理空间框架建立的矿山三维模型,研究基于Zigbee技术的人员定位精度优化。使用物联网技术采集矿山开采实时信息,研究矿山传感数据的实时接入手段与动态融合方法,通过实时数据的获取,分析动态监管矿山开采行为。在山东省开展了试点应用,通过与矿权法定范围实时比对,实现对超层越界非法开采行为的监管。集成了矿山产量监控信息,并结合视频监控技术,实现对矿山超能力开采行为监管,有效保护和合理利用矿产资源。 相似文献
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邬群勇 王钦敏 周成虎 陈传彬 黄瑞垠 WU Qunyong WANG Qinmin ZHOU Chenghu CHEN Chuanbin HUANG Ruiyin 《地球信息科学学报》2007,9(4):85-88
GML作为一种空间信息的编码、存储和交换格式,已逐渐被接受并广泛使用,为实现空间信息的共享和WebGIS的进一步发展提供了一个强有力的工具;SVG作为一种网络时代的图形文件格式标准,综合了矢量图形、位图图像和纯文本的优点,对网络环境有天然的适应性,代表未来网上图形传输发展的方向,因此,基于GML&SVG的WebGIS研究与应用具有广泛的实用价值和应用前景.文中提出了利用GML进行地理信息的存储和集成,并用SVG实现地理信息的Web显示,操作的开放式WebGIS体系结构和解决方案.且在此基础上,建立了GML&SVG的WebGIS应用系统. 相似文献
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以Super Map为基础信息服务平台,SQLite为移动终端数据库,利用Eclipse java EE开发平台,设计实现一套集数据编辑、采集、信息服务、实时动态分析的数字校园服务系统。该系统面向对象程序设计,采用移动GIS服务思想,不仅实现基于手机客户端获取各类实时新闻资讯、校园内部信息(寻找空闲教室、课表查询)、校园离线地图查询、GPS导航路径分析等功能,还探讨了如何在Super Map平台下基于JAVA环境进行客户端和服务端的双向开发功能。系统的实现充分体现出移动GIS在数字校园服务体系中的集成应用模式,亦为设计综合应用系统和大规模集成管理提供了解决思路。 相似文献
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The ability of cell to modulate the fluidity of plasma membrane was crucial to the survival of microorganism at low temperature. Plasma membrane proteins, fatty acids and carotenoids profiles of Antarctic psychrophilc yeast Rhodotorula sp. NJ298 were investigated at -3 ℃, 0 ℃ and 8 ℃. The results showed that plasma membrane protein content was greater at -3 ℃ than that at 8 ℃, and a unique membrane polypeptide composition with an apparent molecular mass of 94.7 kDa was newly synthesized with SDS-PAGE analysis; GC analysis showed that the main changes of fatty acids were the percentage of unsaturated fatty acids (C18∶ 1 and C18∶ 2) and shorter chain saturated fatty acid (C10∶ 0) increased along with the decrease of the culture temperature from 8 ℃ to -3 ℃; HPLC analysis indicated that astaxanthin was the major functional carotenoids of the plasma membrane, percentage of which increased from 54.6±1.5% at 8 ℃ to 81.9±2.1% at -3 ℃. However the fluidity of plasma membrane which was determined by measuring fluorescence anisotropy was similar at -3 ℃, 0 ℃ and 8 ℃. Hence these changes in plasma membrane's characteristics were involved in the cellular cold-adaptation by which NJ298 could maintain normal plasma membrane fluidity at near-freezing temperature. 相似文献
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《极地研究(英文版)》2014,(4)
正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprehensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose 相似文献
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《中国海洋大学学报(英文版)》2014,(4)
<正>Copyright Submfnion of a roanusatpt inks:that the work described has not been published before(exoept In the form of an abstrW or as part of a published lecture,review,or thesis);that it is not under consideration for publication elsewhere that its publication has been approved by ail 相似文献
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《中国海洋大学学报(英文版)》2014,(6)
<正>The Journal of Ocean University of China(Oceanic and Coastal Sea Research)is a comprehensive academic quarterly sponsored by the Ocean University of China,published one volume per year.This journal is devoted to the publication of the theoretical and applied research results on oceanography and marine fisheries.The fieldcovered include the physical,chemical,biological,geo- 相似文献
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Massimo GRECO 《山地科学学报》2014,(6):1383-1384
<正>The 35th IAHR World Congress was held in Chengdu,China from September 8 to September 132013.The title of the conference was:"The Wise Finds Pleasure in Water:Meandering through Water Science and Engineering".During the congress,1239 papers were presented in 139sessions for oral presentations and 7 sessions for poster presentations.After the Congress,a Committee was appointed to select some of the best papers presented at the Congress for publication,after a 相似文献
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As an important component of the cryosphere,sea ice is very sensitive to the climate change.The study of the sea ice physics needs accurate sea ice thickness.This paper presents an electromagnetic-induction(EM) technique which can be used to measure the sea ice thickness distribution efficiently,and the successful application in Bothnian Bay.Based on the electromagnetic field theory and the electrical properties of sea ice and seawater,EM technique can detect the distance between the instrument and the ice/water interface accurately,than the sea ice thickness is obtained.Contrastive analysis of the apparent conductivity data obtained by EM and the value of drill-hole at same positions allows a construction of a transformable formula of the apparent conductivity to sea ice thickness.The verification of the sea ice thickness calculated by this formula indicates that EM technique is able to get reliable sea ice thickness with average relative error of only 12%.The statistic of all ice thickness profiles shows that the level ice distribution in Bothnian Bay was 0.4-0.6 m. 相似文献
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Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area. 相似文献
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Phylogenetic analysis based on 16S rDNA of 8 strains of cultivable bacteria isolated from Arctic sea-ice was studied.The results showed that strain BJ1 belonged to genus Planococcus,which was a genus of low mole percent G C gram-positive bacteria;strain BJ6 belonged to genus Burkholderia of β-proteobacteria and the rest 6 strain all belonged to γ-proteobacteria,of which strain BJ8 was a species of Pseudoalteromonas,strain BJ2-BJ5 and BJ7 were members of genus Psychrobacter.Phylogenetic analysis also indicated that bacteria of genus Psychrobacter of the isolates formed a relatively independent phylogenetic cluster in comparison with other bacteria belonged to genus Psychrobacter. 相似文献
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《极地研究(英文版)》2014,(3)
正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprchensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose is to publish achievements in fundamental research,applied 相似文献