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从网络地理信息系统和Ajax的相关技术入手,分析了基于Ajax引擎的Web应用模型和基于Ajax的WebGIS系统架构。Ajax技术与WebGIS结合,能够实现浏览器与地图服务器之间的异步交互,与传统的WebGIS应用相比,减少了冗余,减轻了请求和响应对服务器造成的负荷。文中以SuperMap IS.NET为开发平台,提出了基于Ajax的WebGIS应用开发方法及应用实例。Ajax的引入,使整个WebGIS的性能达到最佳状态,极大地提升了用户的应用体验。 相似文献
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研究了基于Ajax的异步WebGIS实现技术,并在ArcIMS平台上实现了基于Ajax的异步WebGIS应用.研究表明:Ajax技术与WebGIS结合,能够实现浏览器与地图服务器之间的异步交互,与传统的WebGIS应用相比,减少了冗余,减轻了请求和响应对服务器造成的负荷,使整个WebGIS的性能达到最佳状态. 相似文献
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Ajax技术在WebGIS中的应用与研究 总被引:1,自引:0,他引:1
通过介绍Ajax技术,研究基于Ajax技术的WebGIS原理和实现方法,并和WebGIS的其它不同实现方法进行了对比。相对基于其他Web技术的WebGIS来说,基于Ajax技术的WebGIS具有不受浏览器限制、访问速度快捷、开发方便、费用低廉、可以实现功能定制和扩充、可以在客户端和服务器之间异步通讯等优点。因此,基于Ajax技术的WebGIS可能成为未来WebGIS发展的主流方向。 相似文献
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基于Ajax和Supermap IS.NET2008的WebGIS开发 总被引:4,自引:0,他引:4
介绍了Ajax技术的基本概念及其关键技术,结合北京超图公司当前最新的WebGIS开发平台SuperMapIS.NET2008,阐述了基于两者进行WebGIS开发的主要方法和关键过程,分析了在WebGIS中使用Ajax技术带来的优势。Ajax技术的应用将会为传统的WebGIS开发带来新的生命力。 相似文献
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论述不同层次的Ajax技术应用途径及各个层次的Ajax技术在WebGIS应用中的实现方式,并结合ArcGIS体系探索灵活高效的WebGIS开发技术. 相似文献
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基于Ajax的WebGIS客户端解决方案研究 总被引:1,自引:1,他引:0
对于WebGIS,由于技术原因,缺乏像桌面GIS应用软件那样良好的操作性能,即时的响应以及海量数据快速处理能力,一直是其瓶颈所在。Ajax的出现,改变了这种局面,为WebGIS的发展提供了一个新的方法。本文分析了Ajax的工作原理,并结合Ajax Map对基于Ajax技术的WebGIS客户端解决方案进行了分析研究。 相似文献
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采用Landsat TM数据分析了阿克苏河—塔里木河断面水质污染状况,通过波段的DN值和常规监测数据建立能反映水质状况的
污染物监测模型。结果发现,将2000年常规监测数据代入模型后,与遥感数据的结果基本吻合| 重建阿克苏河—塔里木河的连续水体
污染变化曲线,得出污染物浓度随着远离上游而增加。 相似文献
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Piyoosh Rautela Ramesh Chandra Lakhera 《International Journal of Applied Earth Observation and Geoinformation》2000,2(3-4)
The area around Sataun in the Sirmur district of Himachal Pradesh, India (falling between the rivers Giri and Tons; both tributaries of the Yamuna River) was studied for landslide vulnerability on behalf of the inhabitants. The study was made using extensive remote sensing data (satellite and airborne). It is well supported by field evidence, demographic and infrastructural details and aided by Geographic Information System (GIS) based techniques. Field observations testify that slope, aspect, geology, tectonic planes, drainage, and land use all influence landslides in the region. These parameters were taken into consideration using the statistical approach of landslide hazard zonation. Using the census data of 1991, vulnerability of the populace to the landslide hazard was accessed. As most of the infrastructure in the region is concentrated around population centres, population data alone was used for vulnerability studies. 相似文献
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ZHAN F. Benjamin 《地球空间信息科学学报》2011,(1)
Although it is well known that coseismic gravity changes take place during an earthquake, previous research has not yielded convincing evidence demonstrating that significant gravity changes occur before large earthquakes. Furthermore, even if we suspect that gravity changes occur before large earthquakes, we have yet to demonstrate how to consistently observe these changes for useful earthquake forecast that would bring benefits to society. We analyzed ground gravity survey data obtained in 1998, 2000, 200... 相似文献
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GNSS系统及其技术的发展研究 总被引:3,自引:1,他引:2
阐述了国际上卫星导航系统的总体发展,对美、俄、欧、中的四大全球系统,以及相关的区域系统和增强系统进行了简单的介绍,研究分析了GNSS系统及其技术的发展趋势,同时分析了我国Compass全球系统面临的机遇和挑战,并提出了我国未来工作的建议. 相似文献
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“4D”技术及其应用 总被引:13,自引:0,他引:13
介绍“4D”(即数字地面模型、数字正射影像、数字栅格地图和数字线划地图)系列产品的生产流程、关键技术、及其在耕地保护、防灾减灾救灾和城市规划等方面的应用方法。 相似文献
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《International Journal of Digital Earth》2013,6(1):66-87
Abstract Virtual Australia is not a well-defined or agreed concept. This discussion paper conceptualises Virtual Australia as a ‘virtual [digital] model containing and representing all non-trivial objects and their contextual environment – from blue sky to bedrock – in real world Australia’. It describes a scenario for Virtual Australia, one or two decades from now, in which the locations and conditions of non-trivial objects and their environment are updated automatically through a combination of remote sensing and wireless communication technologies in support of a ‘Supranet’. It then examines the concept of the ‘Supranet’ – a pervasive information network based largely on wireless technology linking the physical world to a virtual model in real time – and develops and discusses three principal characteristics of the Supranet: the ability to have or collect specific information (know); the ability to process information (think); and the ability to communicate that information. If, in the near future, any or all non-trivial devices are to some extent able to know, think and communicate, the potential for object autonomy will be realised. 相似文献
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Toward seamless indoor-outdoor applications: Developing stakeholder-oriented location-based services
Kohei OGAWA Edward VERBREE Sisi ZLATANOVA Naohiko KOHTAKE Yoshiaki OHKAMI 《地球空间信息科学学报》2011,14(2):109-118
Location-Based Services (LBS),an emerging new business based on smartphone and mobile networks,are becoming more and more popular.Most of these LBSs,however,only offer non-seamless indoor/outdoor applications and simple applications without giving stakeholders the chance to play an active role.Our specific aim is to solve these issues.This paper presents concepts to solve these issues by expanding the Open Location Services Interface Standard (OpenLS) to allow seamless indoor/outdoor positioning and to extend the content of the services to include information recommended by stakeholders. 相似文献
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李志宽 《测绘与空间地理信息》2009,32(2)
3维技术以其直观、眩目的表现力深受人们喜爱.利用3S技术和Skyline开发平台,可以构建大型企业3维地理信息系统,以满足企业设计部门和资产管理部门对基础地理信息的需求.兼容原有2维系统的总图3维信息系统,将为企业的日常管理、设计施工、分析统计、规划决策等提供更加可靠、直观、多层次、多功能的综合服务信息. 相似文献