摘要
为了更有效的利用已有数据资源,不造成科研设施的重复投资,数据共享越来越受到重视.NASA对地观测系统(EOS)提供了大量的包括MODIS在内的免费数据资源,为此,EOS Data Dumper(EDD)通过程序模拟EOS数据门户的正常下载流程,采用了先进的Web页面文本信息捕捉技术,实现定时自动下载研究区的全部EOS免费数据,并通过免费的DIAL系统,向互联网重新发布,实现复杂的基于时空的数据查询.从技术角度详细介绍了EDD的项目背景与意义、实现方案。
Data sharing gets more and more attention to make better use of existing data resources, preventing from repeated financial investment. NASA Earth Observing System （EOS） provides a large amount of free datasets （e. g. MODIS） which can be widely applied to geo-science research. However, downloading free EOS data of given study area through EOS Data Gateway （EDG） is a time and labor consuming process, and is not easy to ensure to get data on time and efficiently, due to generally heterogeneous data sources, vast amount of data size, and rapidly updating speed, of remote sensing imagery data. EOS Data Dumper （EDD） addresses this problem, attempting to download EOS free data by a computer program instead of manual work. Functions of automatically downloading EOS data of a specified study area at a given time are then implemented by simulating normal EDG downloading workflow and adopting advanced text-based information capture technology. Data and Information Access Link （DIAL） is used in this system to distribute EOS data already downloaded to local disks by Web to scientists with common interests in the given study area, and to provide a complex spatial and temporal search. In this paper, the background and necessity of EDD are introduced, followed by a detailed description of methodology and key technology involved.
出处
《冰川冻土》
CSCD
北大核心
2007年第3期463-469,共7页
Journal of Glaciology and Geocryology
基金
基金项目:国家自然科学基金委项目(40501054)
中国科学院国际合作重点项目(ARP:O52477)
中国科学院寒区旱区环境与工程研究所知识创新工程项目(2003102
2004115)资助
关键词
EOS数据
遥感影像数据
文本信息捕捉
数据共享
EOS data
remote sensing imagery data
text-based information capture
data sharing
