新大地坐标数据管理系统的开发毕业论文外文翻译(编辑修改稿)

新大地坐标数据管理系统的开发毕业论文外文翻译(编辑修改稿)内容摘要：

a． It is not available for standard users． Coordinate transferring to control points takes in charge by government agencies． The most distinctive character of GNSS is its real time positioning and navigation． Currently， real time kiic(RTK)surveying requires coordinate factors for data processing in teal time． Post processing can not meet the need of this technology． GNSS is not only single point coordinate surveying． The integration of GPS and GIS is being a trend． Data collected by GPS receivers integrated with GIS includes not only coordinates， but also graphs， attributes，topologies， etc． These functions can not be pleted with solo point coordinate transferring． The development of open transferring factors between national coordinate system and GNSS． especially open local coordinate factor to public is essential with the advances of GNSS． Requirements of modern geographic information industry. As a key point of national economic development， the influence of modern geographic information industry has been growing greatly． As a benchmark digital earth representing modern geographic technologies bee the trend of information society， and the objective of digital earth is realizing the integration of economy and society information in the best way and promoting the information for society sharing and wide application． With the advances of every kind technology， nationwide and 10cal area government， enterprise， and different thematic GIS development is getting fast． The development and applications of these systems bring great changes to government and economic management． Coordinate system datum is the basis of data collection and processing for all GIS． For different reasons， there are different coordinate systems existing currently in our country． This requires that GIS software has the functionality of coordinate transferring in time． Transferring factors between different systems are essential． Traditional closed coordinate management mechanism can not meet the needs of GIS developments． The development of information sharing mechanism is the only way for digital earth technology． The final objective is to promote digital earth development，enhance government agency corporation， avoid overlap development， and get high productivity． The information resource standardization 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。 mon users can get the accuracy of177。 1 m． The current national astronomic geodetic work accuracy is lower than177。 1 m． It is an urgent task to promote current national astronomic geodetic work accuracy． The national GPS class A and class B work has been developed． There are 27 points for class A work and more than 700 points for class B work． The point absolute accuracies of class A and。