新大地坐標(biāo)數(shù)據(jù)管理系統(tǒng)的開(kāi)發(fā)畢業(yè)論文外文翻譯-展示頁(yè)
2025-05-27 01:09本頁(yè)面
【正文】 n is a guarantee for digital earth development and operation． The transferring factors between different coordinate systems are important contents of standardization． It is a precondition for data sharing． Proceedings of ISM． 12th International Congress DEVELOPMENT OF OPEN COORDINATE MANAGEMENT SYSTEM Upgrade national astronomic geodetic work coordinate system With the restrictions of technologies， the traditionaI main technology factor to evaluate 8n astronomic geodetic work is relative accuracy． Absolute accuracy is rarely used． As the advances of GNSS。1 m which means an accuracy of 177。100 m total standard users． A new Global Navigation Satellite System(GNSS)was in March 26， 2020 by European Union(EU)to meet their own benefits． Galileo is a program independent of US GPS developed by EU． According to its plan， Galileo program will include 30 satellites with four phases． The first phase is system evaluation period(pleted in 2020)； the second phase is development and test period(from 2020 to 2020)； the third phase is implementation period(2020 to 2020)； and the fourth phase is mercial operation perod(from 2020)． The characteristics of Galileo are its civil purpose and high accuracy． Free of chargeusers can reach177。3 m． As a military targeted system， SA was carried out on the beginning of GPS system and was removed on May 2020 to meet its economic benefits． The US government provides higher accuracy of 177。． Elevation accuracy is better than 710． Absolute accuracy is better than m． For class B work， these accuracies are better than 410， 810， and 177。中文 3252 字 附錄 A:外 文文獻(xiàn) Development of new geodetic coordinate datum management system Abstract： Current situations of geodetic coordinate datum development procedures and China were presented． The precisions of astronomic geodetic work and space geodetion Geodetic datum requirements under the current and future new surveying technologies and their applications were discussed． The necessity for upgrading national astronomic geodetic work and development of a new open coordinate geodetic datum management method was investigated． Key words： Geodetic Datum； Geodetic Network； Management INTRODUCTION Coordinates are the reference for surveying and mapping． The development for a high quality coordinate datum is one of the important tasks for surveyors over the world and also a reflection to the survey technologies in state． Currently， World Geodetic System 1984(WGS84)is the most popularly used coordinate system internationally． There are two nationally used coordinate system， in 1954 Beijing system and 1980 Xi’an systern． There are lots of local coordinate systems developed with different methods in some areas． Considering the importance of coordinate system， a high quality coordinate datum with modern management method is essential． GEODETIC COORDINATE SYSTEM STATUSIN CHINA At the beginning when founding our state． former Soviet Union Krasovsky’s ellipsoid was used for the development of reference coordinate system． The origin of this system was in former Soviet Union． The iointly surveyed coordinates of former Soviet Union geodetic coordinate work and the three points at Huma， Jilalin， and Dongning in Northeast of our country were taken as our astronomi
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