In the practice of highway engineering supervision,using SET2CⅡ can improve the efficiency of wire repetition measurement for the application of engineers.

Line repetition measurement is on important link in transmission line construction,which directs the localization of poles and towers,directionality and linearity of lines.

±12 L~(1/2) is adopted as "the dual tolerances" in repetition measurement of the basic benchmark of a hydrometric station in China,which means ±12 L~(1/2) is not only the tolerance of round-trip survey elevation difference values,but also the tolerance between the new and old elevations after the measurement.

In view of disposing GPS re-measurement control-network of the cities subway, the authors raised the re-measurement s necessary of subway control-network.

The discussions are made in this paper on implement of repetition survey and the comparison of corresponding baselines with original baseline in the data processing.

The Application of the Method of Dual Instruments in Height Resurvey and Control Survey;

This paper refers to the remeasurement project of class II level web in Wuhan and discusses the main characteristics of the project.

This paper discusses and demonstrates these problems, such as the basic conditions and antinomy in using of the older second-class level web of Wuhan urban, the implement and its precision of remeasurement web, and the significance of elevation-transformation and etc.

Research on the importance of repetition measurement and recalculation in survey