Topographical survey is the process of recording precise three dimensional information of a real world object or environment.
Terrestrial Laser Scanning provides high resolution topographic data by measuring the reflect of laser fired from a scanner to the terrain. By sweeping a laser beam over a scene or object, the laser scanner is able to record millions of 3D points.
Thus, the initial output from Terrestrial Laser Scanning is a high density point cloud captured at a rate of thousands of points per second.
With our ILRIS HD Terrestrial Laser Scanner, we can acquire millions of points within each square kilometer which contains precisely measured X, Y, Z points referred to as a point cloud with intensity and/or RGB information providing accurate survey data about the natural as well as man-made features of the land, and its elevation.
This density creates a robust data set which cannot be achieved by the conventional methods. LiDAR is useful because it can provide accurate positions over large areas and can collect 1 tens to thousands of points in a second. LiDAR derived DEM's are more accurate and have wide range of applications in many fields.