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1 问题的提出在进行水下地形测量时,所遇到的最大问题是被测点平面位置的确定问题。因为被测点是在水中,必须借助于船只才能到达。而船在水面上又不易稳定,因此,在测定水深的同时,又要准确测定测深点处的平面位置就比较困难。在过去曾使用经纬仪前方交会法、绳索断面法、视距法等,不但工作量大,所需设备较多,而且还容易出错、精度较差。当然,利用现代化的测量仪器,这个问题也不难得到解
1 PROBLEM PROBLEM The biggest problem encountered during the underwater topographic survey is the determination of the plane position of the measured point. Because the measured point is in the water, it must be reached by means of a boat. However, the ship is not stable on the water surface. Therefore, it is more difficult to accurately determine the position of the sounding point at the same time of determining the water depth. In the past, the theodolite crossover method, the rope cross-section method, the line-of-sight method, etc. were used. This method not only requires a large amount of work and requires more equipment, but is also prone to errors and poor accuracy. Of course, the use of modern measuring instruments, this problem is not difficult to get solution