The GPS-RTK method used for the underwater topography diagraph, can make the control point put with underwater topographic measure at the same time, It make water level observation become easy.

• GPS的RTK工作方式用于水下地形测量，可使岸上控制点的布设与水上测量同步进行，并使水位观测和水下地形点高程的测量变得可靠、简便易行。