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The vertical correction of point cloud strips performed over the coastal zone of changing sea level

机译：在海平面变化的沿海地区对点云条进行垂直校正

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The main principle of LIDAR is to measure the accurate time of the laser pulses sent from the system to the target surface. In the operation, laser pulses gradually scan the water surface and in combination with aircraft speed they should perform almost simultaneous soundings of each strip. Vectors sent from aircraft to the Sea are linked to the position of the aircraft. Coordinates of the points - X, Y, Z, are calculated at the time of each measurement. LIDAR crosses the surface of the sea while other impulses pass through the water column and, depending on the depth of the water, reflect from the seabed. Optical receiver on board of the aircraft detects pulse reflections from the seabed and sea surface. On the tidal water basins lidar strips must be adjusted by the changes in sea level. The operation should be reduced to a few hours during low water level. Typically, a surface of 20 to 30 km2 should be covered in an hour. The Baltic Sea is an inland sea, and the surveyed area is in its South - western part, where meteorological and hydrological conditions affect the sea level changes in a short period of time. A lidar measurement of sea surface, that was done within 2 days, in the coastal zone of the Baltic Sea and the sea level measured 6 times a day at 8, 12, 16, 20, 00, 04 by a water gauge located in the port of Dziwnow (Poland) were used for this study. Based on the lidar data, strips were compared with each other. Calculation of time measurement was made for each single line separately. Profiles showing the variability of sea level for each neighboring and overlapping strips were generated. Differences were calculated changes in sea level were identified and on such basis, an adjustment was possible to perform. Microstation software and terrasolid application were used during the research. The latter allowed automatically and manual classification of the point cloud. A sea surface class was distinguished that way. Point cloud was adjusted to flight lines in terms of time and then compared.
机译：LIDAR的主要原理是测量从系统发送到目标表面的激光脉冲的准确时间。在操作中，激光脉冲逐渐扫描水面，并结合飞机的速度，它们应该几乎同时对每个条带进行探测。从飞机发送到海上的矢量与飞机的位置相关。在每次测量时计算点-X，Y，Z的坐标。激光雷达穿过海面，而其他脉冲则穿过水柱，并根据水深从海床反射。飞机上的光接收器检测来自海底和海面的脉冲反射。在潮水盆地上，必须根据海平面的变化来调整激光雷达条。在水位较低时，应将操作减少到几个小时。通常，一个小时内应覆盖20至30 km2的表面。波罗的海是内陆海域，被调查区域位于西南部，那里的气象和水文条件会在短时间内影响海平面的变化。在2天之内在波罗的海沿岸地区进行了一次激光雷达海表测量，并通过位于海底的水位计每天在8、12、16、20、00、04进行6次海平面测量本研究使用的是Dziwnow港口（波兰）。根据激光雷达数据，将条带进行相互比较。分别为每条线计算时间测量值。生成了显示每个相邻条带和重叠条带海平面变化的剖面图。计算出差异，确定海平面的变化，并在此基础上进行调整。在研究过程中使用了Microstation软件和terrasolid应用程序。后者允许对点云进行自动和手动分类。这样区分了海面类别。根据时间将点云调整为飞行路线，然后进行比较。

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