基于网络爬虫的导航深度服务信息自动采集

根据近来对地理信息Web服务搜索引擎的研究,设计一种基于网络爬虫自动采集POI(Point Of Interest)深度服务信息的方法。使用网络爬虫与DOM(Document Object Model)技术从发布相关POI深度服务信息的网站抓取实时信息,并通过编辑距离与针对地址匹配的改进最大公共子序列分析页面内容与POI主题相关度,进而将相关度最高的深度服务信息与POI点匹配,生成深度服务信息点特征。实验证明了方法的有效性。     

基于Web2.0的课程网络教学平台建设——以地理信息系统概论为例

在Web 2.0技术飙发电举的今天,高校教育体制和教学模式也深受信息化影响,并逐渐走向教育信息化。本文从河南大学地理信息系统概论课程教学改革出发,在现有教学模式基础上,对Web 2.0在高校课程教学平台构建中的可行性进行探讨。通过对传统教学资源的整理挖掘,讨论了地理信息系统概论网络教学平台建设的模式和内容,提出了一套新的地理信息系统概论网络教学平台建设方案,探索了新的教学模式和资源库应用机制。     

时空信息云平台在乱占耕地建房整治上的应用

为满足农村乱占耕地建房问题整治工作的需要,基于Web AppBuilder框架,以拥有宿主寄存技术的智慧黄山时空信息云平台为依托,利用ArcGIS Server服务发布技术结合即用型微件创建了农房核查程序,提供了地图操作、数据编辑、数据汇总统计等功能,为农房核查提供了方便快捷的技术支持。该程序具有易操作、可移植、可交互、响应时间短、用户界面友好等特点。     

Trophic relationships on a fucoid shore in south-western Iceland as revealed by stable isotope analyses, laboratory experiments, field observations and gut analyses

Rocky shores in the North Atlantic are known for their zonation patterns of both algae and animals, which can be expected to greatly affect food availability to consumers at different height levels on the shore. We tested the hypothesis that consumers would feed on the most abundant suitable food source in their surroundings. In total 36 species/taxa of common primary producers and consumers were sampled for stable isotope analyses from a sheltered fucoid shore at Hvassahraun in south-western Iceland. A selection of these species was also collected seasonally and from different height levels. Feeding experiments, field observations and gut analyses were also conducted. Our results were in good overall agreement with pre-existing knowledge of trophic relationships in the rocky intertidal. Consumers often appeared to be assimilating carbon and nitrogen from the most common diet in their immediate surroundings. The predator Nucella lapillus was thus feeding on different prey at different height levels in accordance with different densities of prey species. When tested in the laboratory, individuals taken from low on the shore would ignore the gastropod Littorina obtusata, uncommon at that height level, even when starved, while individuals from mid-shore readily ate the gastropod. This indicated that some kind of learned behaviour was involved. There were, however, important exceptions, most noteworthy the relatively small contribution to herbivores, both slow moving (the gastropod L. obtusata) and fast moving (the isopod Idotea granulosa and the amphipod Gammarus obtusatus) of the dominant alga at this site, Ascophyllum nodosum. The recent colonizer Fucus serratus seemed to be favoured. Selective feeding was indicated both by isotope signatures as well as by results of feeding experiments. Seasonal migrations of both slow and fast moving species could partly explain patterns observed.     

地理信息公共服务平台的用户分类及服务分类

地理信息技术的发展经历了集中式、模块化、组件化的过程,目前正向地理信息的Web服务方向发展。传统的集中式地理信息系统中,功能的分类决定了用户的分类;而在地理信息服务的架构中,用户的分类导致服务的分类及其与用户分类的映射。本文从地理信息服务的架构出发,分析并提出了面向服务的地理信息公共服务的用户群分类与对应的服务分类,为地理信息公共服务平台的构建和地理信息服务资源的有效组织和整合提供理论依据。     

基于OGC规范的遥感影像数据服务研究

以遥感数据共享为研究对象,针对传统遥感数据共享方法存在的问题,提出了基于WebService技术和OGC规范的遥感数据共享方案,设计了基于WMS和WCS的遥感影像数据服务,为用户提供在线遥感影像查询、浏览与获取服务,实现了遥感影像数据共享方法服务化。     

基于WMS的公路交通信息发布系统

采用WMS将公路交通专题地理数据与测绘框架地理数据进行集成与整合,实现跨行业和跨区域的空间地理数据的共享交互操作,并详细阐述系统的整体设计思路、系统架构及关键技术,最后对采用WMS在其它行业的应用进行展望。     

GIS在应急预案中的应用研究

基于Internet的WebGIS是目前地理信息发展的趋势之一,GIS与GPS的结合应用将在应急的WebGIS系统中发挥重要的作用。本文结合以上两种技术的应用,提出了在GIS应急预案中特有的解决方案。借助于GPRS无线网络、Web Service服务及其Epoch IMS WebGIS平台做了具体的程序实现,开发完成了应急系统中常用模块。系统利用网格化管理理论,以GPS/GIS为基础,实现对应急GIS网络设施的巡查和指挥调度,提高巡查业务的工作效率。在高效、准确完成指挥调度应用的基础上,充分挖掘已有数据,为客户提供一个全面的监控、调度、数据分析系统。从而为应急领域的系统决策提供了技术支持。     

数字城市共享平台框架的设计与实现(英文)

This paper proposes a theoretical framework of spatial information sharing in a digital city, and analyzes its technical characteristics. According to the service-oriented architecture (SOA) framework, a geospatial information sharing platform is put forward. The spatial information sharing model based on SOA is designed. A prototype platform realizing multiple-source spatial information sharing based on ArcGIS Server is developed. Supported by the National Key Basic Research and Development Program of China (No.2004CB318206), the Basic Research of Survey and Mapping Bureau Project (No.1469990711111).