Application of EPSW Electronic Plotting Systemto Opening Diversion Channel Closure ofThree Gorges Project

The planar position of both sides of the dam front edges are always looked as a dynamic track during the course of opening diversion channel closure. It is convenient, speedy and credible for us to take advantage of Trimble laser top station, equipped with EPSW98 made in Qinghua Shanwei to monitor the water surface width between both edges of the dam at real time, at the same time, it also can present us the high precision survey products and safeguard in stead of manual operation. Moreover, in this paper, a kind of new brainpower cartography on making use of EPSW98 to process the under water terrain survey data is introduced, this method can not only enhance the plotting efficiency greatly, and can also reduce the probability of making mistakes.