Earth Observing System Data Gateway
Earth Observing System Data Gateway
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地球观测系统数据网关
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
M. Nestler
中科院分区：
文献类型：
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作者：
R. Pfister;Joe McMahon;J. Amrhein;Ed Sefert;Lorena Marsans;Mark A Solomon;M. Nestler
地球观测系统数据网关（EDG）软件提供了一个“一站式”标准界面，用于探索和订购存储在地理上分散的站点的地球科学数据。EDG使用户能够执行以下操作：1）根据高级标准（例如，地理位置、时间或获取数据的卫星）; 2）浏览搜索的结果，查看满足用户标准的数据的缩略图草图;以及3）对所选数据进行排序以便递送到所选介质上的指定地址（例如，光盘或磁带）。EDG由（1）一个实现高级客户端/服务器协议的组件和（2）一组实现EDG客户端和一个或多个EDG服务器之间协议消息传递的C语言库组成。EDG服务器位于通常称为“分布式主动存档中心”（DAAC）的站点。每个DAAC可以允许访问许多单独的数据项，称为“颗粒”（例如，单一陆地卫星图像）。相关的颗粒被分组到称为“数据集”的集合中。EDG使用户能够同时向多个DAAC发送搜索查询，检查结果信息，选择可浏览的颗粒，然后以无缝的方式从不同的站点订购选定的数据。
The Earth Observing System Data Gateway (EDG) software provides a "one-stop-shopping" standard interface for exploring and ordering Earth-science data stored at geographically distributed sites. EDG enables a user to do the following: 1) Search for data according to high-level criteria (e.g., geographic location, time, or satellite that acquired the data); 2) Browse the results of a search, viewing thumbnail sketches of data that satisfy the user s criteria; and 3) Order selected data for delivery to a specified address on a chosen medium (e.g., compact disk or magnetic tape). EDG consists of (1) a component that implements a high-level client/server protocol, and (2) a collection of C-language libraries that implement the passing of protocol messages between an EDG client and one or more EDG servers. EDG servers are located at sites usually called "Distributed Active Archive Centers" (DAACs). Each DAAC may allow access to many individual data items, called "granules" (e.g., single Landsat images). Related granules are grouped into collections called "data sets." EDG enables a user to send a search query to multiple DAACs simultaneously, inspect the resulting information, select browseable granules, and then order selected data from the different sites in a seamless fashion.