Analysis on Influence of Ship Draught on Water Depth Measuring

There are many unstable factors which may cause errors of water depth data easily in the water depth terrain surveying work.Wrong draught of surveying ship is one of the erroneous reasons.Therefore the size and type of surveying ship are very important.According to the practical work experience,the reasons causing the depth data errors by draught changes of each kind of surveying ship are analyzed and the method which can reduce the error in various situations are also proposed in order to increases the water depth measuring accuracy.