I-SiTE - Laser Scanning Revolutionises Site Survey

MAPTEK's revolutionary I-SiTE 3D Laser Imaging System, presented in this paper, is a new means of collecting 3D information quickly and directly from any large scale environment. The system records accurately the location of features and surfaces in areas such as urban and industrial settings and mine sites, both surface and underground. Points sampled from the scene are used to build a data set which is a complete 3D rendering of the scene. By interactively viewing the data using the built-in software, it is possible to see the scene in ways that would not usually be possible. While laser scanning systems have been available for some time for small scale engineering tasks, their use in larger scale environments is not widespread. tance of 100 m, allowing even small features to be captured in coarser scans. A rotating polygonal mirror directs the beam in a vertical direction (fast scan), while the entire head rotates to move the beam in a horizontal direction (slow scan). Angle encoders record the orientation of the mirror and head for each range measurement, creating a raster pattern of range and intensity values with each point uniquely positioned in 3D. The vertical range is 80 degrees centered on the horizontal and the horizontal scan covers 340 degrees (Fig. 2). Figure 2. Acquisition of 3D points from a slope at varying horizontal and vertical angles using the laser scanner of the I-