Selection of the best values in the observations of horizontal control network;

Establishment of GPS horizontal control network and the construction of Huangjingling Tunnel are introduced and data processing is analyzed t,o exemplify other similar projects to a great extent.

In the surveying programming,the error ellipse with titled angle as an output should be automatically achieved after the strict adjustment of the horizontal control network.

Research purposes: The method of distributing plane control net and principles of precision design are presented in this paper through doing the researches on the design of plane control net for construction of ballastless track of passenger dedicated railway.

In this article,authors introduce key points and difficulties of the construction measure process of the main stadium project of Nanjing Olympic Sports Center,emphasize establishment and accuracy requirements of a plane control net,and state measuring and position fixing jobs of some special parts of this project.

Theoretical analysis and suitable evaluation of the relative position error of plane control network;

This paper discussed the accuracy and density requirements of the layout scheme of plane control network for real estate.

This paper discusses the selection and determination of plane control network coordinate system based upon the features of setting up route plane controlled measurement for highway.