数据描述语言（DDL）及其在地球物理数据管理中的应用  

DATA DESCRIPTION LANGUAGE (DDL) AND ITS APPLICATIONS IN GEOPHYSICAL DATA MANA GEMENT

作　　者：狄黎平 

出　　处：《地球物理学进展》1995年第4期80-87,共8页Progress in Geophysics

摘　　要：科学家所能运用的科学数据每天都在增加，但这些数据都是以各种不同格式存在的。数据格式问题已成为当今数据管理和分析中的一大问题，它直接妨碍了数据的共享与通用性。其中一个解决办法是采用标准格式，但此方法经试验证明不能显著减轻格式问题。当前科学数据管理的最新进展之一，是数据描述语言的发展与采用。数据描述语言方法不限制数据于几种标准格式中，而是通过一种描述机制来直接描述所面临的各种格式。在这种机制下，我们可以发展格式独立的数据存取与分析系统来处理和分析任何可以被此机制所描述的格式的数据。同时，带有数据描述的数据可以在数据管理和分析系统中通用。本文介绍了数据描述语言的概念，讨论了数据描述语言方法在解决数据格式问题上的优越性，并着重介绍了由美国国家地球物理数据中心发展的数据描述语言ＦＲＥＥＦＯＲＭ及其相应的数据存取系统和它们在地球物理数据管理中的应用。The amount of geophysical data available to scientists is becoming more overwhelming every day.However, those data exist in diverse formats. The data format problem is one of the most serious barriers faced by modem scientific data management and analysis. It hampers the data inter-operability and data sharing among data management and analysis systems. A solution, the standard format, has been tried but the problem has not been significantly diminished.One of the most exciting recent developments in geophysical data management is the creation and application of data description languages (DDL). Instead of constraining data to a small set of″standard″formats, the DDL approach confronts the diversity of data formats directly by describing data format explicitly using a data description mechanism. With this mechanism, format-independent data access and analysis tools can be developed to process data in any format describable by the mechanism, and datasets with their descriptions will be inter-operable between data management and analysis systems.This paper introduces the concept of data description language, discusses the benefit of DDL approach for solving the format problem, and details FREEFORM DDL with related data access system developed by NGDC and their applications in the geophysical data management.

关 键 词：地球物理勘探 数据管理 数据描述语言 

分 类 号：P631.14[天文地球—地质矿产勘探]