Supply Hubei Xie Tianxiang quality GPS point mark (umbrella)

Dam as an important water conservancy and hydropower facilities, is the need for strict protection and long-term monitoring. While monitoring, the importance of GPS survey indicators point signs can not be ignored. ? Deformation monitoring of common methods which do Hubei 谢天祥 following will take you go to look at three common methods:? 1 forward intersection method: dam surface deformation including horizontal and vertical displacement, in the determination horizontal displacement, they can use to influence the deformation outside the scope of the control point, and this time we should use forward intersection method is simple, it's the concept as follows: known coordinates A, B two points, if you want to calculate the unknown point P coordinates, just an observation angle A and angle B can be. ? 2. Polar law: it is known in the control point to set a horizontal angle and a distance from the plane to determine the position of the point, mainly for the case to be tested from the control point set point closer. If you use a total station to survey and design, it is not subject to the above conditions, restrictions, and determination for it to be more flexible. ? 3.GPS positioning technology law: in recent years it has been widely used in dam deformation monitoring, not only simple and convenient, portable instrument, without the need of sight between the observation points, and high accuracy, can automatically accept store information It can reduce the trivial mapping work to improve mapping efficiency. When observing the use of GPS technology law, using synchronous static observation, the reference point, the transformation point above the crest, it was incorporated into the work point for unified GPS network observations. ? These are the three common methods of dam deformation monitoring, and where GPS positioning technology compared to the traditional manual method of measuring means has a greater advantage, GPS point mark in which also played a role can not be underestimated, in the future, it and will certainly usher in a more broad application prospects. (This article is from: http: //www.hbxtxch.com)