Multidimensional Analysis, Environment, Time And Space-based Gis In The Yangtze Delta And Its Adjacent Waters

The land-ocean interaction is a hot research under the background of"the global change". Moreover large-scale estuary and surrounding area is the most important region to implement this research. Estuaries and coastal system is the connection region of Earth Geosphere (hydrosphere, biosphere, lithosphere, atmosphere), and its land-ocean interaction is the most active, ecological environment is frail and mechanism is complex. Sediment and water discharge could affect the environment in estuary and coastal system via the complex process of estuary interface which could be explained by sediment dynamic process and biogeochemistry process.The estuary environment is dynamic and complex; therefore it is important to consider two aspects - time and space which are an inevitable trend for interation in the environmental research of estuary and surrounding area. Utilizing the space and time analysis in the environment of estuary and coastal area, can grasp the distribution and changes of environment essential factors in the time and space, discover the changing rule of environment essential factors, and provide important decision information for the government in the same time.Changjiang (Yangtze) estuary and surrounding area has bright region characteristic and displays prominently in: muddy coast, high turbidity water and shallow shelf. Therefore, it is important to choose Changjiang (Yangtze) estuary and coastal area to investigate the sediment dynamic process, biogeochemistry process and coastal environment in the background of sediment flux variation. It could not only provide scientific basis in the decision of important project, coastal zone resources using and environmental protection, but also develop the theory of land ocean interaction.Multi Dimensional Database (MDD) developed in the application of date warehouse. It could be explained in a simple way: Stores data in a multi-dimensional array, but didn't only record them as a relational database. The multi-dimensional data model can make the data modeling to be simpler. Because the research person can describe the structure of the complex real world conveniently, didn't need to neglect the question in real world, or display the shape which could be improved in the technology, moreover the multi-dimensional data model could shorter the time in implementing complex process. Compares with the relational database, the advantage of multi-dimensional database is in raising the speed of data processing, speeding up the reaction time and raising the inquiry efficiency.The environmental data in estuary and surrounding area is multi-dimensional array, namely time, space (longitude, latitude and depth) and et al. Each kind of environment investigated data is a measure value for every dimension intersectional point. Therefore it fits for the data of multi-dimensional construction in modeling and storage. At the same time, the date of multi-dimensional construction could implement conveniently in many kinds of geology analyses, such as analyzing in geometric horizontal section and cross section, which are used frequently in geology analysis.GIS is comprehensive technology in computer, geography, metrology, cartology and so on. It as an instrument in processing the data of geology in input, output, management, inquiry, analysis and aiding in decision making, provides an efficient method in the information of management and analysis by its ability of data integration, processing and visualization performance.This article introduces the GIS and the multi-dimensional database into the environment research in Changjiang (Yangtze) estuary and surrounding area, proposed multi-dimensional data model of environment in Changjiang (Yangtze) estuary and surrounding area, studies the method of marine environmental data in implementing space and time analysis. Also analyzes parts of multi-dimensional environmental data in Changjiang (Yangtze) estuary and surrounding area via the method of space and time analysis, interprets the distribution and variation of suspended matter, nutrient, sediment discharge and water discharge, issues and shares the multi-dimensional environmental data based on the WebGIS technology.