Web Geoservices and Ancient Cadastral Maps: The Web C.A.R.T.E. Project

In the State Archive of Como, Northern Italy, about 15,000 historical maps belonging to different national cadastral productions are preserved. The Web C.A.R.T.E. project was started to enhance the accessibility of this valuable cartographic heritage using FOSS (Free and Open Source Software) technologies. The system, which implements specific web geoservices for cataloguing and visualization, should assist the State Archive of Como in the digital management of its cartographic resources and related information. After the high‐resolution digitization step, maps undergo a georeferencing operation. A special statistical procedure for choosing the best mathematical model was developed, verifying also strengths and weaknesses of georeferencing with a common free and Open Source GIS. Next, metadata consistent with current Italian standards were added to the georeferenced maps using an ad hoc localized version of GeoNetwork Opensource (recently provided as the official Italian version of the software). A dedicated WebGIS system was built for publishing the georeferenced cadastral maps. This system is capable of navigating large raster data in a georeferenced framework and easily retrieving their metadata. The WebGIS system for the State Archive of Como is an important contribution for the preservation of the original historical paper maps and also a great modernization and simplification of the end user's access to this archive.     

浅析网络地理信息系统WebGIS的构建技术

WebGIS是地理信息系统与Internet技术相结合的产物,是当前地理信息系统应用和研究热点。本文阐述了WebGIS的特点,介绍了目前实现WebGIS系统的几种构建模型、实现方法及其数据的管理和组织,并进行了详细的分析和比较。     

基于Netty和MongoDB的车联网Web系统

为了促进车联网技术的快速发展,本文设计并实现了一款采用B/S架构的车联网Web系统.该系统利用Netty框架的异步非阻塞通信机制,采集并传输车辆行驶数据和车内状况数据;在WebSocket协议的基础上实现浏览器页面的快速响应,实时性好;使用基于NoSQL的MongoDB数据库存储车辆的行驶轨迹数据,存取速度快;本系统实现了对车辆运行状态的监测、历史轨迹查询、地点搜索、路径规划、天气预报等功能.实验结果表明,本系统工作性能稳定,显示界面友好,有很强的工程背景.     

参与型GIS：Web2．0下的地理媒介

分析PGIS、PPGIS、VGIS的产生及其内在联系,阐述参与型GIS作为地理媒介的发展趋势,总结出PGIS媒体化框架。论述了Web2．0背景下PGlS的新特点。探讨如何以PGIS作为决策者与公众之间的沟通媒介,实现“公众参与决策”的概念。     

The Sensor Web: systems of sensor systems

Abstract

Global Earth Observing System of Systems (GEOSS) presents a great challenge of System of Systems integration across organisational and political boundaries. One existing paradigm that can address the scale of the challenge is that of the Sensor Web. In this paradigm, the internet is evolving into an active, macro sensing instrument, capable of drawing sensory data from around the globe to the fingertips of individuals. The Sensor Web will support scientific research and facilitate transparent political decision making. This article presents some of the technologies explored and activities engaged in by the GEOSS Sensor Web community, towards achieving GEOSS goals.     

基于ASP.NET的地理信息Web服务研究

ASP.NET是网站和XML Web服务的产物,是.NET框架中的核心要素。论文探讨了基于ASP.NET框架的地理信息Web服务(GI Web service)的实现原理,提出了服务体系软件架构,就应用服务器端组件设计、服务器端Web自定义组件设计等关键技术问题进行了深入分析,实现了一个Web服务原型系统。该原型系统经在校园网上测试,表现出良好的稳定性和较高的效率。     

Brackish water aquaculture site selection in coastal track of cannanore (Kerala) using remote sensing and GIS techniques

Aquaculture has emerged as one of the fast growing industries in the developing countries both for domestic consumption as well as for the export. This industry not only generates foreign exchange to the country but also provides employment opportunities to the skilled and unskilled rural poor. On the other hand, aquaculture has also some negative impacts on the environment which are mainly due to conversion of mangroves and agricultural, salination of surface water resources and agricultural land at some places besides causing pollution and diseases. All the major shrimp farming countries of the world have faced environmental problem due to intensification, improper and uncontrolled planning by greed and unlimited profit motives of a section of aquaculture community. In view of this, a proper environmental management is a basic need to sustain the industry in the long run. Selection of a suitable site in the coastal areas is the first and the foremost step which is a crucial factor in determining the success of shrimp farming. The present paper discusses the selection of brackish water aquaculture sites using remote sensing satellite data and GIS on the Cannanore coast. Different aquaculture sites in the area were evaluated using a GIS package. Finally a prioritization map showing the sites in the descending order of their priority was generated.     

GeoPW: Laying Blocks for the Geospatial Processing Web

Recent advances in Web‐related technologies have significantly promoted the wide sharing and integrated analysis of distributed geospatial data. Geospatial applications often involve diverse sources of data and complex geoprocessing functions. Existing Web‐based GIS focuses more on access to distributed geospatial data. In scientific problem solving, the ability to carry out geospatial analysis is essential to geoscientific discovery. This article presents the design and implementation of GeoPW, a set of services providing geoprocessing functions over the Web. The concept of the Geospatial Processing Web is discussed to address the geoprocessing demands in the emerging information infrastructure, and the role of GeoPW in establishing the Geospatial Processing Web is identified. The services in GeoPW are implemented by developing middleware that wraps legacy GIS analysis components to provide a large number of geoprocessing utilities over the Web. These services are open and accessible to the public, and they support integrated geoprocessing on the Web.     

The Geographer's Craft: Teaching GIS in the Web

The Geographer's Craft is a two-semester course introducing GIS and geographic research methods using active-learning, problem-solving techniques. All of the materials for the course were developed in hypertext form in the World-Wide Web (WWW). The organization of this electronic textbook and laboratory manual is explained and related to principles for using the WWW to enrich GIS education. Teaching strategies are discussed as are lessons learnt in developing hypertext courseware. The value of enlisting student participation in the development process is stressed. Note is made of the ways in which Web-based materials may lead to the emergence of distance of education programmes in GIS. The project homepage is http://www.utexas.edu/depts/grg/gcraft/contents.html     

Geospatial Service Web: towards integrated cyberinfrastructure for GIScience

A geospatial cyberinfrastructure is needed to support advanced GIScience research and education activities. However, the heterogeneous and distributed nature of geospatial resources creates enormous obstacles for building a unified and interoperable geospatial cyberinfrastructure. In this paper, we propose the Geospatial Service Web (GSW) to underpin the development of a future geospatial cyberinfrastructure. The GSW excels over the traditional spatial data infrastructure by providing a highly intelligent geospatial middleware to integrate various geospatial resources through the Internet based on interoperable Web service technologies. The development of the GSW focuses on the establishment of a platform where data, information, and knowledge can be shared and exchanged in an interoperable manner. Theoretically, we describe the conceptual framework and research challenges for GSW, and then introduce our recent research toward building a GSW. A research agenda for building a GSW is also presented in the paper.     

基于ASP.NET的Web GIS性能的优化

随着Web GIS的快速发展和广泛应用,对Web GIS的性能提出了更高的要求.ASP.NET是微软推出的新一代动态网页技术,它提供了强大的Web应用开发功能,开发基于ASP.NET的Web GIS是当前实现Web GIS的较佳方案之一.基于ASP.NET的Web GIS具有灵活性和动态特性,但是在获得这种灵活性和动态特性的同时却导致Web GIS性能降低.因此,有必要通过.NET框架内置的优化特性、程序设计中的一些性能优化技巧与ASP.NET的缓存技术的运用,降低Web GIS服务器的负载,使得设计和实现的Web GIS性能更优、效率更高.