To greet the ocean age of the 21 century, proceeding from the development strategy of the country, China has included the project on the development of the "digital ocean" in the National Marine Science and Technology Development Plan for the period of Tenth Five-year-Plan and the long-term tentative plan for the year 2015. The goal of the project is collect information on 3-D ocean monitoring, complete the digitizing project of marine information and the establishment of the marine spatial data infrastructure and to realize sharing of the marine information and establishment of the basic project of "digital ocean".Research and development of the project "221" for "digital ocean" will be carried out in the period. That means two key technologies: technology for spatial data infrastructure and technology for "digital ocean" support; two platforms: research and development on dynamic 4-D marine geographical information system and demonstration for application.
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