如保正确使用百分表

百分表是技术测量工作中应用广泛的精密量具。百分表主要用于测量零件的尺寸和几何形状偏差,也可用于检验机床几何精度或调整加工零件装夹位置偏差等。正确使用百分表 (1)根据不同需要选用内径百分表表架、平面百分表表架或万能百分表表座。 (2)根据测量要求,选择适当量程、压缩量和测头的百分表。例如。

Analysis on accuracy of Engineering Star RTK in cadastral survey based on SOUTH-CORS

Currently,with the fast development of GPS technique,GPS RTK is rapidly being applied to the cadastral survey. GPS RTK technique not only improves efficiency and accelerates the rate of mapping,but also increases economic efficiency. The authors introduced a method for GPS RTK rapid positioning,which uses continuous operational reference system (CORS) as a base station to change the method of previous map drawing by obtaining real-time three-dimensional coordinates of boundary points and statistically analyzing with the three-dimensional coordinates obtained by Total Station to get the accuracy of GPS RTK real-time coordinates. The application of GPS RTK in practical measurement was discussed when the data link had been lost especially. The results show that the three-dimensional coordinates measured by total station can be replaced by real-time three-dimensional coordinates measured by Engineering Star RTK in the CORS.