地震科学数据共享工程

地震科学数据共享工程是在国家科技基础条件平台统一规划和管理下, 应用现代信息技术, 整合离散的地震科学数据资源, 构建面向全社会的网络化、 智能化的管理与共享服务体系, 实现数据采集、 加工、 保存的标准化、 规范化。 文中分析地震科学数据资源的现状, 介绍了地震科学数据共享工程的概况、 技术思路、 建设目标和实施步骤。     

南阳市地下管线综合信息管理平台设计与实现

结合南阳市地下管线综合信息平台的设计理念和研发实践,阐述了数据库结构和平台的功能设计,为政府及各管线权属单位提供了管理决策的科学依据,为探索地下综合管线信息化管理提供了有效途径。     

Maritime safety for fishing boat operations and avoidable hijacking in Taiwan

Taiwanese fishing boats have been hijacked many times this year. Trouble at sea can usually be attributed to communication problems, inappropriate management and an unfair salary system. The majority of boats hijacked are high sea (long-line) fishing boats. Although fishery authorities ask the fishing boats to set up vessel monitoring systems (VMSs), this precaution has not been sufficient. There is a further need for improved management by the fishing boat owner and for an improved employment policy for seamen. The issue of maritime security is not new, but it remains a major concern and continues to be a threat to Taiwan and other countries. To date, there have been many cases of hijacking in the South China Sea. This paper analyzes the reasons for the hijackings and provides potential strategies to prevent future incidents.     

Estimation of infragravity waves at intermediate water depth

The accuracy of nearshore infragravity wave height model predictions has been investigated using a combination of the spectral short wave evolution model SWAN and a linear 1D SurfBeat model (IDSB). Data recorded by a wave rider located approximately 3.5 km from the coast at 18 m water depth have been used to construct the short wave frequency-directional spectra that are subsequently translated to approximately 8 m water depth with the third generation short wave model SWAN. Next the SWAN-computed frequency-directional spectra are used as input for IDSB to compute the infragravity response in the 0.01 Hz–0.05 Hz frequency range, generated by the transformation of the grouped short waves through the surf zone including bound long waves, leaky waves and edge waves at this depth. Comparison of the computed and measured infragravity waves in 8 m water depth shows an average skill of approximately 80%. Using data from a directional buoy located approximately 70 km offshore as input for the SWAN model results in an average infragravity prediction skill of 47%. This difference in skill is in a large part related to the under prediction of the short wave directional spreading by SWAN. Accounting for the spreading mismatch increases the skill to 70%. Directional analyses of the infragravity waves shows that outgoing infragravity wave heights at 8 m depth are generally over predicted during storm conditions suggesting that dissipation mechanisms in addition to bottom friction such as non-linear energy transfer and long wave breaking may be important. Provided that the infragravity wave reflection at the beach is close to unity and tidal water level modulations are modest, a relatively small computational effort allows for the generation of long-term infragravity data sets at intermediate water depths. These data can subsequently be analyzed to establish infragravity wave height design criteria for engineering facilities exposed to the open ocean, such as nearshore tanker offloading terminals at coastal locations.     

基于MapGIS和AutoCAD的GIS与CAD图形数据共享的探讨

在分析了一般GIS和CAD系统图形数据的基础上,从MapGIS和AutoCAD两种系统在测绘、地质图件中常用的图元实体类型的数据结构的比较入手,介绍了MapGIS与AutoCAD联合开发实现两种图形数据格式互相转换工具的实现。     

地理本体的研究进展与分析

地理本体是地理信息科学中的一个新兴的和正在发展的研究领域,从提出至今仅有10年的历史。因此,有重点系统分析地理本体研究的发展历程与进展,对中国在此方面的研究定位具有重要意义。文章在深入分析科学领域本体的定义基础上,进行了地理本体定义,探讨了地理本体的研究意义,列举了国际上与地理本体相关的主要计划与学术会议,详细剖析了当前国内外的地理本体理论研究与应用方面取得的进展。地理本体研究已成为国际GIS领域一个重要的新兴研究方向并得到了蓬勃发展,而国内在这方面的研究才刚刚开始,只有少数学者开展了一些探索性的思考和研究。因此,中国应紧跟国际地理本体的研究动态,积极开展我国自己的地理本体理论、方法和应用研究。     

WebGIS在地震地磁数据共享系统中的初步应用

为了实现地震地磁数据的社会资源整合和共享的目的, 利用网络、 WebGIS及数据库技术, 开发了基于网络环境的地震地磁数据共享系统; 系统实现了信息服务、 数据服务和功能服务, 改善了地震地磁数据的应用领域和应用层次。 从系统原理及功能设计、 WebGIS系统、 地震地磁数据库系统、 Web发布及数据共享子系统等几个方面阐述开发建设过程中的主要技术环节。     

Struts和Hibernate在信息共享平台中的应用与研究

科学数据共享是一个重要的研究领域,但是由于缺乏足够的技术支持,导致从海量数据中找出有用信息,实现信息的完全共享还存在不足。本文结合Struts和Hibernate技术,提出了一种信息共享平台的框架。利用Struts优化了数据表示层和数据处理层的设计,利用Hibernate优化了共享平台的数据持久层的设计。文章先分析了这两种技术的应用,接着重点说明了如何利用它们构建一个4层结构的共享平台,该平台可以对多种数据进行管理和分析,能在多个服务器间提取出有用的信息供用户浏览、下载和查询,从而实现了信息的共享。     

利用数据库系统进行地震数据管理和共享服务

讨论了在数据管理和共享服务中数据库系统相对于文件系统的优越 ,介绍了当今数据库系统的发展现状和方向,并列举了成功应用数据库系统进行数据管理和共享服务的范例,从而论证了地震系统建设分布式数据库系统的必要性。