Coordinate Systems In The Informationized Surveyingand Mapping And Itsapplication Research

This text starts off from the concept of the Informational Mapping,educes a series of coordinate systems.Then, in allusion to the diversity and disunity of these coordinat systems,analyses the applications actuality and development demand of our country's reference system and coordinate norm.For the sake of unifying all mapping productions from different measures to geographic space database,also distilling data from database to fulfil coordinate application demand of ervery walk of life,this text puts emphasis on analysis and applications of coordinate norm.The central content and conclusion includes several aspects hereinafter:1. Having a systematical conclusion ,trimness and analysis towards various coordinates adopted in the nowadays surveying and mapping navigation fields.Combined with application requirement of the informationized surveying and mapping navigation,pointing out that the high accuracy, dynamic state, 3D center of earth coordinates will be unified coordinate norm in the space information of future geography to collect, management and express.2. Made a statistics analysis to the coordinate accuracy of earth center of ITRF2005, which has the highest accuracy nowadays.We can know by the analysis,that in three kinds of main space measure techniques of ITRF:(1)The inside match accuracy of GPS is highest,VLBI second,and SLR a little worse;(2)The accuracy of height direction is widespreadly lower;(3)See from three kinds of techniques, the accuracy degree of longitude and latitude direction of the GPS and VLBI are obviously better than height direction,but the SLR technique distributes more balanced in accuracy of three directions ;(4)The outside match accuracy of GPS and SLR, VLBI is all millimeter class, but that of SLR and VLBI is a little lower with cm class, 2 cm at most;3. Made an elaborate expatiation about definition and realization method of CGCS2000, and compared it with WGS-84,which gets to a conclusion:CGCS2000 and WGS84 are compatible in current scope accuracy of the coordinate system realization and application, and their coordinates can be thought to be consistent;4. Combining with the Bursa model,made use of the minimum two multiplication principles,respectively gave conversion model of two dimensional and three dimensional coordinate system under the circumstance of existence of surplus observation , gave the sieving method of public points.Through verification of actually measure of the WGS-84 and ITRF2005 data to 3D converted model,and two kinds of accuracy which include inside matched and outside matched valuation method to prove the high accuracy and usability of the model;5. Introduced establishment method of local area surface of sphere:inflation method, moving method, transmogrification method, and put forward an improvement calculation way on this foundation, which considers the inclination of two sphere surfaces,gave related theory methods and formulas.Made use of thr minimum two multiplication principles to give the related calculation theories and formulas of sphere surface with several points;6. In allusion to application requirement of geography information expression in the future true 3D space, studied that making use of coordinates,analyzed related calculation methods and formulas of various space geometry parameters,and introduced its application in space analysis.