An Approach for Automatic Orientation of Big Point Clouds from the Stationary Scanners Based on the Spherical Targets

• Main Authors: YAO Jili, MA Ning, JIA Xiangyang, XU Guangpeng, XIE Jianchun
• Format: Article
• Language: zho
• Published: Surveying and Mapping Press 2015-04-01
• Series: Acta Geodaetica et Cartographica Sinica
• Subjects: big point clouds; spherical targets; SOCS; engineering coordinate system; coordinate converting; topographic survey
• Online Access: http://html.rhhz.net/CHXB/html/2015-4-431.htm

Terrestrial laser scanning (TLS) technology has high speed of data acquisition, large amount of point cloud, long distance of measuring. However, there are some disadvantages such as distance limitation in target detecting, hysteresis in point clouds processing, low automation and weaknesses of adapting long-distance topographic survey. In this case, we put forward a method on long-range targets detecting in big point clouds orientation. The method firstly searches point cloud rings that contain targets according to their engineering coordinate system. Then the detected rings are divided into sectors to detect targets in a very short time so as to obtain central coordinates of these targets. Finally, the position and orientation parameters of scanner are calculated and point clouds in scanner's own coordinate system(SOCS) are converted into engineering coordinate system. The method is able to be applied in ordinary computers for long distance topographic(the distance between scanner and targets ranges from 180 to 700 m) survey in mountainous areas with targets radius of 0.162m.