A question discussion of the triangle elevation network elevation begins reckoning;

This paper introduces the data analysis and processing of Wujiang D-grade GPS control net,specially the connection of the old and new GPS control networks,disscussing the method of how to select starting points,and supplying some suggestions on how to use the independent coordinate system of Suzhou City.

According to methods and accuracy requirements of checking starting point data of GPS control network by current specifications and regulations, this paper analyses the checking methods and effect and discusses the methods for selecting starting point.

This paper introduces several practical methods of the compatibility analysis of starting point for GPS surveying network, and then base on a practical example, makes some analysis on these methods.

There has been a long time dispute on the jumping-off point of general budget.

Theoretical mechanism and empirical analysis of origin-based algorithm are addressed for user equilibrium traffic assignment.