高程点
The traditional hydrographic model is that plane position is determined by GPS, and depth is observed by echo sounding system, under the condition of possession of tide observation datum, the height point under water can be gotten.
传统的水下地形测量模式定型于利用GPS测定水底点的平面位置，利用测深仪测定水底点的深度，附之以瞬时潮位资料，获得点位的高程。
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