Integrated Research And Software Realization Of Measuring Coordinate System Transformation

With the continuous development of economic construction,different reference ellipsoids have been used in different development periods in China,and each reference ellipsoid has its corresponding coordinate system.At present,the space geodesy technology is becoming more and more perfect,the original reference ellipsoid has been unable to meet the daily production needs.The most advanced reference ellipsoid used in China is the 2000 reference ellipsoid,which corresponds to the 2000 national geodetic coordinate system.At present,many fields require the use of geocentric coordinate system,such as aviation,navigation,etc.,2000 national geodetic coordinate system as China's first geocentric coordinate system,it can meet the needs of social development.However,most of the surveying and mapping data in the early stage of China are based on the Beijing 54 coordinate system and the 1980 xi 'an coordinate system.In order to make the existing surveying and mapping data and the original surveying and mapping data mutually universal,the research on how to achieve the transformation of surveying and mapping results between different coordinate systems is of great significance to the development of the society.In this paper,the following aspects are studied in order to realize the rapid and accurate coordinate conversion:(1)This paper introduces the kinds of coordinate system and several coordinate systems commonly used in China,and analyzes and compares the characteristics of different coordinate systems;(2)The conversion method between different forms of the same coordinate system is described in detail,and the accuracy of the conversion formula is verified by an example;(3)The influence of common point and transformation model on the accuracy of coordinate transformation is studied.In order to determine the distribution range of the optimal public points in the transformation region,a search method for the optimal public points is proposed based on the influence of the factors of common points and the influence of the number of common points on the conversion accuracy.The accuracy of 2d coordinate conversion model and 3d coordinate conversion model in different regions is compared and analyzed,and the applicability of different models in different regions is discussed;(4)In order to realize the fast and accurate conversion between different coordinates,the software is developed.On the basis of the conversion between coordinates which can be processed in batches,the batch processing of graphics is realized,and the conversion accuracy is verified by an example.