随着数字城市、数字地球、数字流域等概念的提出与应用，对空间数据的存储与处理提出了更高的要求。
Along with the concepts of Cyber-City, Digit Earth and Cyber-River being put forward and applied, the higher efficiency of storing and processing spatial data is demanded.
港口是海洋与城市的交界，因而数字港兼有数字海洋与数字城市的功能与特征，同样是数字地球中一个不可缺少的重要组成部分。
The Port is the boundary between the city and the ocean, It has the functions and the characters of the city and the ocean. So Digital Port is also indispensable to Digital Earth.
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