摘要
随着越来越多基于网络、自动化的信息共享系统的广泛使用,元数据已成为不同学科间共享信息的关键。近年来气象数据的应用领域不断扩展,气象数据面临着海量信息流通共享的迫切需要,由此气象元数据应运而生。该文介绍的气象元数据是在满足WMO(世界气象组织)信息系统提出的包括提供在线元数据、数据目录服务和提高元数据定义、收集、归档和交换的标准化水平在内的总体需求的背景下,依据WMO核心元数据标准设计并由自开发程序自动生成的。北京GISC系统是WMO信息系统中承担区域间及全球资料交换的主干通信中心之一,至2012年1月,北京GISC系统制作并提供系统内全部数据对应的气象元数据,共计约12万条。
As the use of automated and web based systems increasing,metadata has become the key to sharing information between people working in different disciplines.As the interest of other earth science communities in meteorological data increases,there is a great deal of meteorological data which need to be transferred and shared.Traditionally weather data has been exchanged without metadata,i.e.,the information about the data itself.It is assumed that the recipient understands the abbreviated message format,and has access to any metadata needed to determine the meaning of the transmitted data.This mode of data exchange works well within the meteorological community.However,it will be a problem for users outside of the meteorological community.Meteorological metadata will be the key to resolve the problem. The standardization of metadata within the meteorological community is becoming an important task during the last couple of years.WMO has recognized the importance of standardized metadata.A CBS expert team has been established after the CBS conference in 2000,aiming to develop a proposal for a WMO metadata standard.The team came up with the draft WMO Core Metadata Profile,version 0.2 at the end of 2003,based on the geographical standard ISO 19115. During the 14th World Meteorological Congress（Cg-XIV,2003）,a plan is approved for developing an overarching,integrated WMO Information System（WIS） that could meet the requirements of all WMO programs,affiliated international organizations and programs.The WIS architecture,functions and services will provide the solution for information exchange,management and access.Its main functional organizations include National Centers（NC）,Data Collection or Product Centers（DCPC）,and Global Information System Centers（GISC）.China Meteorological Administration（CMA） has joined WIS program and achieved the core function requirement of GISC,including providing entry points and data service,through Beijing GISC and comprehensive metadata catalogues. In Beijing GISC,DAR（Discovery Access and Retrieval） meteorological metadata is the foundational information used for managing data resource and providing service of data discovery and access.It＇s also the reference information used for users to discover and retrieve data and products in WIS.An introduction is given on the background of applying DAR meteorological metadata in WIS,the WMO Core Metadata Profile,the metadata template applied in Beijing WIS portal,and how to generate DAR metadata instance in CMA.There are about 120000 corresponding DAR metadata for all the meteorological data provided by Beijing GISC.
出处
《应用气象学报》
CSCD
北大核心
2012年第2期238-244,共7页
Journal of Applied Meteorological Science
基金
公益性行业(气象)科研专项(GYHY200906042)
