The establishment and precision validation of the first level surveying control network in Ezhou Huahu Airport
The first level surveying control network must be established before the construction of large engineering.For large engineering in non urban areas,the research and application of establishing horizontal and vertical surveying control networks at the same time is less.This paper introduces the process of establishing surveying control network of Ezhou Huahu Airport in detail.Firstly,using global navigation satellite system(GNSS)static observation mode to establish horizontal surveying control network(the relative accuracy of the weakest edge is 2.15 ppm);Secondly,using level survey to establish vertical surveying control network(the mean square error of height is 0.037 mm);Finally,using the two sets of coordinates to calculate the transformation parameters of airport area(the mean square error in seven-parameter and four-parameter conversion are 0.35 cm and 0.02 cm,respectively),furthermore,The known points outside the network are checked by using the transformation parameters,and mean square error of horizontal is 0.39 cm.The results show that the control network established in this project is reliable,and this method can provide reference for similar projects.
Ezhou Huahu Airportsurveying control networkdata processingcoordinate transformation parameters
NETL
NSTL
万方数据
维普
