The vertical positioning of the dredge can be done by water conversion calculation positioning or use the method of RTK-GPS positioning.
疏浚船垂直定位可通过水面换算定位或采用RTK—GPS定位两种方式。
At last, the qualitative method of defect analysis is showed, which can dredge up underlying information.
最后，提出了一些定性的缺陷分析方法，可充分挖掘缺陷的潜在信息。
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