Surveying apparatus

A surveying method for detecting an abnormal part of a target object by using a surveying apparatus that has a combined structure of a total station and a laser scanner, relationships of exterior orientation parameters between the total station and the laser scanner being known in advance,

• the surveying method comprising:
• a step of acquiring first point cloud data and second point cloud data that are obtained by laser scanning, the laser scanning being performed on the target object multiple times at a time interval by the laser scanner;
• a step of calculating a difference in position information between the first point cloud data and the second point cloud data to detect a part of the target object, at which the position information varies between a first time the first point cloud data is obtained and a second time the second point cloud data is obtained, as a detailed-inspection target part;
• a step of acquiring a position of the detailed-inspection target part;
• and
• a step of performing control for sighting by rotating the total station toward the detailed-inspection target part, to make the total station sight the detailed-inspection target part, on a basis of the position of the detailed-inspection target part,
• wherein the laser scanning is performed by emitting positioning laser light while sweeping the positioning laser light,
• the total station performs positioning on multiple points at the detailed-inspection target part in such a manner that:
• positioning is performed by emitting the positioning laser light to one of the multiple points, multiple times;
• an average of results of the positioning that is performed multiple times is used as positioning data;
• and
• the positioning is repeated until all of the multiple points are positioned, whereby multiple pieces of the positioning data are obtained, and
• the multiple pieces of the positioning data are used to detect the abnormal part that occurs between the first time the first point cloud data is obtained and the second time the second point cloud data is obtained.