The Research On Grid Coordinate Transformation Method And Its Application In Distributed Environment

This dissertation mainly focuses on the methods of grid coordinatetransformation and its application in distributed environment,including the basicmethod of grid coordinate transformation,the principle of interpolative model,thecomputation model of grid coordinate transformation in distributed environment thestructure of the distributed environment and its application. The main works andcontributions are summarized as follows:1. The principle and computation method of these five interpolative models suchas covariance prediction, multiple regression, weighted average, multi-quatricfunction and minimum curvature are studied in grid transformation，which is tocompare and analyzed in several aspects such as computation process, transformationaccuracy and whether it is easy to realize or not. Finally it is concluded that multipleregression model should be recommended as the prior one adopted in grid coordinatetransformation.2.The structure and method of grid transformation based on multiple regressionmodel are designed and realized.The algorithm process and the model of computationare decomposited in order to apply distributed computing.The computing workflowand the scheduling of the subtasks in grid computing are also discussed.3.The application of several distributed technology are compared ingeodesy.The distributed computation environment which is apply to grid coordinatetransformation is built.The overall architecture of distributed environment is designedin which the grid coordinate transformation can be carried out.4.The real-time datum transformation based on web service technology isachieved. The overall architecture,the system functions and the hierarchical model ofthe service platform are designed and planned.Finally, the strategies for thetransformation of survey control site, data documents and digital topography maps areanalyzed and listed out.5.The application of grid coordinate transformation under distributedenvironment in multi-sources navigation data integration is studied. Based on the gridcoordinate transformation, this paper has produced the method to fit the systematicerrors of multi-sources maps.