Research Of Key Technologies Of Integration Of Ocean Observation Data For Sensor Web

Modern observations of ocean environment is characterized by means of using a variety of sensors, instruments and many observation platforms, which are all space-time, high-density, high frequency of stereographic observation of the sea area. Modern ocean observation has entered the era of three-dimensional observation, which is from space, sea surface, underwater to seabed-based. Different observation methods have great difference in data collection, data quality control, preprocessing and storage, product processing, information dissemination and so on, so the Ocean Observational Systems have the various needs. According to the large number of long-term, in-situ, continuous, large-scale multi-element observation data of the Ocean Observational Systems, how to effectively acquire, transfer, store and process data, which will provide multi-element live data for the marine science research and ocean management. Certainly, this will greatly enhance the observation capability of the variety of ocean phenomena, which has an important significance in system construction of data integration and information service of the Ocean Observational Systems.In this paper, for the Sensor Web, the uniform standard and specified interfaces for the Ocean Observational Systems'data integration and information services as a whole structure is put forward, in which standardization of heterogeneous historical ocean observational data based on XML and Ocean Sensor Web of real-time ocean observing data are further researched. XML, which has tree storage structure and supporting for deep-level nested expression, is able to describe ocean observational data with the capacity of more complex and closer to the reality compared with the relational database structure. At the same time, XML can be granularly updated, which change the traditional data construction and process approach in the aspects of data acquisition, pre-processing, quality control, metadata extraction, data storage, and maintenance of ocean observational data. Sensor Web has the capability of system description, auto-discovery, data quality control, data representation, data acquisition and transmission. And all kinds of real-time ocean sensor observational data resources can be found, visited and applied through the Web, which can provide the standard platform for building Web-based plug and play real-time ocean sensor web. The main research content and results of this paper are as follows:1. According to the different data acquisition, processing, storage and publish of ocean observing data, this paper gives analysis of related technologies of domestic and international ocean observing data integration and information service. while for the actual needs of ocean observation data integration, this paper puts forward the "ocean perception networks" model for future data integration and information service of the Ocean Observational Systems, which has the basis of "ocean sensor web".2. According to the large number of long-term, in-situ, continuous, large-scale multi-element observation data of the Ocean Observational Systems, the uniform standard and specified interfaces for the Ocean Observational Systems'data integration and information services as a whole structure is put forward, in which standardization of heterogeneous historical ocean observational data based on XML and Ocean Sensor Web of real-time ocean observing data are further researched, at the same time gives the corresponding design thoughts.3. Firstly, the existing heterogeneous ocean environment observational data has been scientifically classified, and then extract the Data Element of all kinds of the ocean environment observational data, next map the aggregating data element or sets of Data Elements to XML Schema, lastly, develop the XML Schema standard of ocean environmental observation data. At the same time, the metadata standard based on XML is also developed, which supports the data source of original data files, standard datasets, data table, database and data warehouse, and at the basis of the above standard, the metadata directory service system of ocean is designed and implemented.4. According to the sharing, distribution and integration of ocean basic data, ocean space data and ocean business data of multi-level nodes within the sectors of nation, province and city, the ocean data exchange platform based on the mode of asynchronous message is designed and developed, which has the multi-level tree transmission system architecture of "Center-Agent", here, the "Center" and "Agent" share the different roles together to complete the exchange of ocean data.5. The hierarchy model of Ocean Sensor Web is designed and built in accordance with the hierarchical design concept, using SOA architecture. The specific application service of various kinds of ocean sensors, as web service, is registered following the typical service registration process. The ocean sensor web prototype has been designed and implemented, including the ocean data source layer, ocean sensor data layer, ocean sensor Web service layer and ocean observational application layer.