range mark

Research and Application of the Inland River Navigation Mark Automatic Telemetering and Management System Jiangsu Province; Design of Master Unit of Medium Range Underwater Telemeter and Telecontrol System

江苏省内河航标自动遥测管理系统的研制与应用中程水下测距及遥控系统主控机设计

Height of gravity points that is height above sea level rather than ellipsoid height measured with GPS used in gravity survey in China was measured by method of ignoring height abnormity within a range of 50 km from datum mark.

GPS测量测得的是椭球高程，而我国重力测量求得的是水准高程。目前，野外工作中采用GPS基准站周围50km范围内忽略高程异常的办法进行重力测点高程的测量。

CIRCLE OF LIFE Knowledge Accumulating Skill By computing the center of the Mark region, the accumulating range of circle center in Hough transform is restricted near this center.

计算Mark区域中心点，Hough变换圆心累加范围限制在这个中心点附近区域。