A research on the scanning resolution of Terrestrial Laser Scanners: An indoor example

Terrestrial laser scanning (TLS) method is a powerful method used for the collection of spatial data. With this method, fast, contactless and precise measurement of objects is ensured. Terrestrial laser scanning systems display the strength of the backscattered laser scanning signal of each point recording the 3D (3D) coordinates and an intensity value. Density values vary according to the characteristics of the measured object and the parameters of the environment. The strength of the backscattered electromagnetic signal is affected by the reflectivity of the scanned object surface, the angle of incidence, the distance between the laser scanner and the object, and the atmospheric and system-specific setting of the YLT measurement, respectively. Model-based approaches are impractical, as the details of the inter-system variation of the signal are often unknown to the user. On the other hand, existing data-based calibration values require the laborious acquisition of separate reference data sets from field data or fields with homogeneous reflectance properties.