The laser measurement data of ship axis is collected by multi-line laser radars, and the three-dimensional data of navigable ships are statistically analyzed, which can be used for the statistics of upstream and downstream flow of navigable ships, the measurement of three-dimensional characteristic data of ship length, width, height and side, and the information of ship speed, whether it is loaded or not can be obtained, which can be used as important basic data for bridge collision avoidance detection. Through the three-dimensional data fusion algorithm, a complete three-dimensional model of navigable ships can be obtained, which provides strong data support for the subsequent big data analysis.

The axis of a ship, that is, the shafting from the main engine to the propeller, is often connected by several shafts located in the same straight line, which are called shafts. The shafting from the main engine to the propeller is usually connected by several shafts located in the same straight line, which are called shafts.