Abstract: With the greatly increasing of the tower building from place to place,the potential risk caused by the deformation of the tower building has been taken more and more attention.In view of limitations and inefficiency of the traditional methods,this paper puts forward the new method of inclination monitoring of tower building based on point cloud data generated by 3D laser scanner.Firstly,we need to capture point cloud of target object using two set of different 3D laser scanner.Secondly using the point cloud to build tower building ground surface model.Thirdly,generating central point along the axis direction and filtering the correct point group.At last,calculating the offset and amount of inclination with high accuracy of target object.In addition,we also program to realize the output of calculation result just by one key.It turns out that the angle error between the new method and traditional method is separately 0.005° and 0.001°.The amount of inclination is separately 0.000 05 and 0.000 1 m.This method could not only quickly obtain offset variation characteristics of target object and part of them,but also could provide the foundation data model for the construction,maintenance and reconstruction of them.

Key words: tower building, laser point cloud, slope deformation monitoring, laser scanner, amount of inclination