MapGIS K9 IMS的Flex开发模式研究及应用

对MapGIS K9 IMS的Flex开发框架展开研究,重点介绍了Flex客户端的结构及常用的控件,然后结合一个应用实例说明了MapGIS K9 IMS的Flex开发WebGIS的主要过程和关键问题,最后总结了基于MapGIS K9IMS的Flex开发模式设计与开发WebGIS的优势.     

基于Flex技术的WebGIS开发新模式

依据Flex RIA的技术特点,探讨了基于Flex的RIA WebGIS开发新模式,构造出了一个实用的RIAWebGIS应用开发框架,并引入ArcGIS Server10分布式系统及Flex桌面端程序模块化以提高系统效率,最后据此提出系统设计方案,开发了某市的工业地理信息管理系统。结果表明,利用Flex技术开发富用户体验的富客户端WebGIS是一种理想的方式。     

基于ArcGIS Flex API的WebGIS设计

本文根据Flex技术体系与特点,分析了基于Flex的WebGIS的系统结构,阐述了Flex在WebGIS设计中的优势所在;并结合ESEI公司的ArcGIS Flex API,设计了某地的"三防"决策管理WebGIS系统,论文从数据链接、地图显示、统计图表等功能实现说明了基于Flex的WebGIS设计过程;实践证明,使用Flex能够有效地提高WebGIS客户端的交互能力。     

基于RIA与AMF协议的WebGIS框架设计

提出了一种基于RIA的WebGIS框架,选用Flex作为客户端实现技术,利用REST实现各种资源的访问;同时提出基于AMF协议的客户/服务器交互方式,有效改善了客户端与服务器的交互效率。实验表明,基于该框架的WebGIS系统具有良好的客户端体验,高效的分布式信息交互能力;信息能够以统一的形式进行传输,系统的扩展性与可重用性都得到了有效的提高。     

基于Flex的WebGIS应用框架研究

WebGIS即万维网地理信息系统,WebGIS本质上属于GIS的一种技术手段,它利用了交互网络技术,完成了扩展和完善地理信息系统的的功效。富因特网应用程序(Rich Internet Applications,RIA)的出现为基于万维网的地理信息应用提供了更加丰富的数据模型和更加丰富的界面元素,极大地增强了用户的体验。微软出品的SilverLight软件、Adobe推出的Flex软件都是RIA客户端的开发框架的代表。本文主要研究讨论基于Flex的两种WebGIS应用框架。     

基于Flex的广州大学城交通服务WebGIS设计

根据Flex技术体系与特点,分析了构建基于Flex的WebGIS软件的系统结构,并阐述了Flex在WebGIS设计中的优势所在。利用ESRI公司的ArcGIS API for Flex开发包采用ASP.NET后台技术,设计并实现了广州大学城交通服务WebGIS系统。结果表明,使用Flex能够有效提高WebGIS客户端的交互能力,极大地提升了交通服务管理水平与效率,但是ArcGIS API for Flex开发包仍然存在一些不足,例如前后端通讯表现不足以及查询功能较弱等。     

基于 Flex 的台风预报信息分析系统设计与开发

随着台风预报技术的发展,结合WebGIS的应用也日趋增多。但由于受到HTML等技术的限制,许多工作都必须在服务器端执行,增加了服务器的压力,并延长了系统响应时间。因此,Flex作为富客户端开发的代表技术框架,为新型WebGIS的设计和开发提供了强有力的技术支撑。通过研究Flex技术以及ArcGIS API for Flex接口包,利用Web Service和XML技术实现台风预报系统的前后台数据通信,基于Flex开发了一套可用于台风预报分析的系统。该系统共包括四个模块,分别是地图模块、预报员预报模块、预报会商模块和工具模块。该系统运行结果表明,基于Flex技术的台风预报系统较其他系统具有如下优势：①可在客户端执行部分系统功能,减轻服务器端的压力,提高系统响应速度;②用户界面得到美化,提高系统的交互体验;③利用该系统,台风预报员可以加载已有的台风预报数据进行分析,并在此基础上,进行各自的预报及会商预报。     

基于SuperMap iServer的福建省统计信息系统设计

福建省统计信息系统是基于地理空间信息框架和WebGIS下的一种统计数据直观表达与可视化的发布方式,结合了目前主流的RIA技术,以SuperMap iServer作为GIS应用服务器,采用SuperMap iClient for Flex作为网络客户端GIS开发平台,在Flex Builder平台进行二次开发,设计出一个既具有良好的用户交互界面,操作简单的福建省统计信息系统,实现了统计数据的Web发布、查询、专题图可视化等,系统的建设可为社会经济信息的分析利用以及政府辅助决策提供参考。     

基于Flex的开源WebGIS框架研究

探讨了基于开源服务器GeoServer与OpenScales的空间数据渲染引擎,设计并构建了基于富客户端技术的WebGIS应用框架,实现了基本的WebGIS应用,为富客户端开源WebGIS应用研究提供了新思路。     

基于组件式WebGIS的统计专题图的实现

采用RIA主流的Flex技术平台Flex Builder作为网页设计载体,利用其技术优势结合组件式WebGIS—MapGIS IGServer组件功能,阐述基于组件式WebGIS的统计专题图的设计原理与思路,以福建省统计年鉴的历年统计数据为例,设计并实现一个在线发布统计数据、生成结合地图的统计专题图站点,方便用户利用客户端交互操作获取更加直观的统计数据及相关统计图表,可为统计机构在改进网站功能和统计数据的发布方式时提供新的思路。     

阿克苏河-塔里木河水系水质污染遥感监测与评价

 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。     

Monitoring drought dynamics in the Aravalli region (India) using different indices based on ground and remote sensing data

The hard-rock hilly Aravalli terrain of Rajasthan province of India suffers with frequent drought due to poor and delayed monsoon, abnormally high summer-temperature and insufficient water resources. In the present study, detailed analysis of meteorological and hydrological data of the Aravalli region has been carried out for the years 1984–2003. Standardised Precipitation Index (SPI) has been used to quantify the precipitation deficit. Standardised Water-Level Index (SWI) has been developed to assess ground-water recharge-deficit. Vegetative drought indices like Vegetation Condition Index (VCI) and Temperature Condition Index (TCI) and Vegetation Health Index (VHI) have been computed using NDVI values obtained from Global Vegetation Index (GVI) and thermal channel data of NOAA AVHRR satellite. Detailed analyses of spatial and temporal drought dynamics during monsoon and non-monsoon seasons have been carried out through drought index maps generated in Geographic Information Systems (GIS) environment. Analysis and interpretation of these maps reveal that negative SPI anomalies not always correspond to drought. In the Aravalli region, aquifer-stress shifts its position time to time, and in certain pockets it is more frequent. In comparison to hydrological stress, vegetative stress in the Aravalli region is found to be slower to begin but quicker to withdraw.     

Landslide risk analysis between Giri and Tons Rivers in Himachal Himalaya (India)

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.     

Gravity Changes Before Large Earthquakes in China: 1998-2005

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...     

GNSS系统及其技术的发展研究

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.     

“4D”技术及其应用

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。     

Virtual Australia: its key elements – know,think, communicate

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.     

Toward seamless indoor-outdoor applications: Developing stakeholder-oriented location-based services

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.     

GIS空间数据的采集误差及其分析

本文详细阐述了GIS数据采集过程中的误差来源，重点分析了通过地图、遥感和摄影测量等方式采集数据所产生的误差及其特性，分析了其对GIS数据的影响与消减方法。     

地理数据库的关系模型及其实现

本文从以图论观点分析地理实体入手,系统阐述了地理数据库关系模型的设计法和过程。作者于1984年4～9月间在微型机上设计建立了关系型地理数据库的实方验系统(RGDB)。该系统采用了本文提出的关系模型,采用了可动态扩库的子库组合结构,这种结构具有灵活性和提高空间利用率的优点。RGDB含有多种功能的数据操作命令,除了具有一般检索功能外,还能进行“开窗”选取和十分“自由”的映象选取。本文对RGDB系统的主要性能和实现途径作了扼要介绍。