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Geospatial Coordinate Reference System Fusion Engine And Practice

Posted on:2007-10-17Degree:MasterType:Thesis
Country:ChinaCandidate:P YangFull Text:PDF
GTID:2120360212475837Subject:Cartography and Geographic Information Engineering
Abstract/Summary:PDF Full Text Request
In all the countries of the world, hundreds of the geospatial coordinate systems are used. And there are more than ten types of map projections in common use. The production and support of geospatial information need the geographic information that is based on these coordinate systems and map projections to fusion. Coordinate operation must firstly be implemented, and make the different types of coordinates into an appointed coordinate system. So base on the guideline of systematism, practicability and maneuverability, the main researches of this thesis are:1. The geospatial coordinate reference system fusion engine is put forward. Discuss the basal concepts include coordinate system, datum, coordinate reference system, geospatial coordinate reference system and geospatial coordinate reference system fusion engine. Analyse the outside relation of the engine, the inside framework of the engine and the flow of the coordinate operations.2. Research the basal concepts and formulas of coordinate conversion, the formulas of the radius of curvature in a normal section, the meridional length and the latitude of pedal are given. After discussing the efficiency and precision of the 5 types of methods about from geodetic coordinates to geodetic rectangular space coordinates, the iterative method is optimized by a new method. The formulas of Gauss-Kruger projection, Mercator projection and conic orthomorphic projection are discussed. The precision of Gauss-Kruger projection is improved by the iterative method of floating coordinate system. And the application of these projections is introduced.3. The reference-ellipsoid-centric coordinate system and the geocentric coordinate system are introduced. After concluding transformation model between the geodetic rectangular space coordinate systems, the Bursa model and Molodensky model are discussed. After introducing the transformation model between the geodetic coordinate systems, the general geodetic coordinate differential formula, Molodensky formula and Morozov projection differential formula are discussed and compared. The solution and application of transformation parameters are discussed. After introducing the height system, a transformation model prototype is put forward.4. The history and application of geodetic datum, vertical datum and map projection about China, Chinese Taiwan, USA, Japan, Korea and India are researched.5. The software implement of the engine are researched. The three levels of the software are put forward. They include a copy of source code, two types of interfaces and three suits of solutions. For the source code, the agile software development, extreme programming, pair programming, refactoring and test-driven development are discussed. For the two types of interface, the DLL and COM are researched. The raster map and vector map transformation solutions are discussed in detail. And a prototype system of engine is implemented. At last, after concluding the principia and method of optimization of code, the engine is optimized, especially for Gauss-Kruger projection program.
Keywords/Search Tags:datum, coordinate reference system, geospatial coordinate reference system fusion, geospatial coordinate reference system fusion engine, coordinate operation, coordinate conversion, coordinate transformation
PDF Full Text Request
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