EGM 2008模型在水利工程测绘中的应用探讨

Application of EGM 2008 model in water conservancy engineering surveying and mapping

水利工程通常具有巨大的地理空间范围和复杂的地形条件,在工程设计和施工阶段需要准确的地理信息,因此对数据的准确性和可靠性要求很高。基于EGM 2008模型的GNSS高程拟合方法获得的正常高可以达到较高等级的精度要求,可以满足大比例尺地形图测绘,数字航空摄影测量等任务。本文通过EGM 2008模型在GNSS数据处理的应用研究,阐述GNSS拟合高程计算的原理和方法,并进一步说明其在GNSS控制网数据处理,网络RTK技术方面的应用。最后通过实际案例证明其成果的准确性和可靠性。

A water conservancy project typically has a huge geographical spatial range and complex terrain conditions,requires accurate geographic information during the design and construction stages of the project.Therefore,the requirements for the accuracy and reliability of data are high.The normal height obtained by the GNSS elevation fitting method based on the EGM 2008 model can satisfy the accuracy requirements of relatively high level,and can meet the tasks such as large-scale topographic mapping and digital aerial photography survey.The application of EGM 2008 model in GNSS data processing was studied,based on which the author elaborates the principle and method of GNSS fiting elevation calculation,and explains its application in GNSS control network data processing and network RTK technology.Finally,the accuracy and reliability of the results are proved by practical cases.