Study And Application Of Spatial Database Integration Based On GRID

The grid has been the third generation application of internet after traditional internet and web. Actually, grid computing has emerged as a new important technology upon the internet. It is orientated to be coordinated resource sharing in dynamic, multi-institutional virtual organizations, even problem solving such as scientific problem and engineering-oriented one. The spatial database integration based on grid is a typical application in sharing the database of geographic information system source on grid. It is an effectual approach to deal with the separated spatial database and sharing them with others.The geographic information system spatial database integration based on grid (in short, GRID-GIS SDI) is aim to obtain and share the separated, heterogeneous spatial database. The spatial database integration based on grid has been a hot spot in geographic information area in recent years, and its development are associated with the development of grid, database and database integrated middleware technology. The integrated middleware is the core in the exchanging data processing between GIS users and spatial databases, further more, its performance are most important factor in the new designed GRID-GIS SDI system. Studying the data exchaning theory between middleware and data resources,the author supposed a improved middleware degisn.at the same time,with the help of improved middleware, the author designed the spatial database integration system in the grid container.The GRID-GIS SDI can systematical connect to many spatial database from different geographic information system, and form a virtual geographic database platform to all geographic information system users.Considering the related ISO (international standardization organization)standard and the geographical database characteristic based on grid, the author's main work and contribution are as follows.Firstly, anaylsing in detail the associated technology with spatial database integration such as grid, GML, spatial database, and etc.Secondly, after studing the theory of the middleware called OGSA-DAI and find the shortcoming in it, the author suggest a problem solving blue print to extend the functions of middleware by improving the design of it.Thirdly, with the help of the improved integrated middleware called OGSA-DAI, the author not only designed a system called GRID-GIS SDI but also realized heterogeneous database integration such as relational database, XML database, file database in the new GRID-GIS SDI system.And the last, the author constructed the architecture of spatial database integration system, and realized heterogeneous spatial data access by running the GRID-GIS SDI system, so as to further confirmed the system accuracy and reliability.