A web-based geographic hypermedia system: data model, system design and prototype applications
首发时间:2011-02-21
Abstract:Geographic hypermedia (GH) is a rich and interactive map document with geo-tagged graphics, sound and video elements. A geographic hypermedia system (GHS) is designed to manage, query, display and explore GH resources. GHS has various applications such as geographic education, tourism marketing and facility management. Recognizing emerging geo-tagged videos and measurable stereo videos as valuable geographic data resources, this paper aims to design a web-based GHS using web mapping, geoprocessing, video streaming and XMLHTTP services. The concept, data model, system design and implementation of this GHS are discussed in detail. For presenting, querying and displaying video data in the GH document, the authors introduce a mixed strategy for data organization. The geo-tagged video data entities include video clip, video path, frame and frame-based descriptions. These data were organized into video files, GIS layers with linear reference and XML documents for publishing via video streaming services, web mapping services or XMLHTTP services respectively. Similarly, the geo-tagged stereo video and derived data were modeled as interrelated elements: original video, rectified video, stereo video, video path, frame, frame-based geospatial description, 3D surface model and measurable image (rectified and disparity image with baseline, interior and exterior parameters). The geospatial data and multimedia data were integrated in DHTML pages or as rich internet applications (RIA) using standard web technologies such as AJAX, ASP.NET, Java and RIA frameworks. The SOA-based GHS was designed using four types of web services: ArcGIS Server 9.3 web mapping and geoprocessing services, Flash FMS 3.0 video streaming services and GeoRSS XMLHTTP services. The prototype system was implemented using existing web technology such as DHTML with JavaScript, Asp.Net and Adobe RIA. GHS applications in road facility management and campus hypermapping indicated that the GH data models and system frameworks introduced in this paper are useful and flexible enough for wider deployment as a GHS.
keywords: geographic hypermedia geographic hypermedia system data model web service system design
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网络地理超媒体数据模型、系统设计与应用研究
摘要:地理超媒体是指将地图与图片、音频、视频等地理多媒体资源集成的、内容表达丰富且具交互性的富文档。地理超媒体系统是用于管理、查询、表现和探索地理超媒体资源的信息系统,在地理教育、旅游营销、设施管理等领域具有应用价值。认识到正在兴起的地理视频、可量测立体视频是宝贵的地理数据资源,本文尝试使用地图服务、地理分析服务、视频流媒体服务和XMLHTTP服务设计网络地理超媒体系统,详细地探讨了相关的数据模型、网路服务、系统设计与相关应用。为在地理超媒体文档中表现、查询和播放视频数据,作者提出采用混合结构数据进行数据组织。对于普通的地理视频,将其抽象为视频片段、视频轨迹、视频帧和地理描述等实体,使用视频文档、具有线性参照的GIS图层和XML文档管理数据,并分别使用视频流媒体服务、地图服务和XMLHTTP服务发布数据。而将地理立体视频及派生数据分解为原始视频、校正视频、立体视频、视频轨迹、沿视频轨迹的三维表面模型、视频帧描述、校正影像和视差图等基本实体。使用AJAX, ASP.NET, Java和RIA等网络技术将地理数据和多媒体数据集成在HTML或富互联网应用(RIA)文档中。基于SOA框架,将地理超媒体系统设计为四个层次:数据层、服务层、逻辑层和表现层。使用ArcGIS Server 9.3地图服务和空间分析服务、Flash FMS 3.0视频服务和GeoRSS格式的XMLHTTP服务,作者使用多种Web技术成功开发出地理超媒体系统原型。公路设施管理和校园超媒体地图应用表明:本文提出的数据模型和系统框架具有实用价值,对于进一步开发地理超媒体应用系统具有借鉴价值。
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