SPECTRAL CHARACTERISTICS OF DIFFERENT BUILDING MATERIALS BY THE EYES OF LASER SCANNING

Abstract

During the last few years, terrestrial laser scanning has become a standard method of data acquisition in close range domain. Full-waveform terrestrial laser scanning is a recent technology which is able to digitize and record the complete waveform of the backscattered echo. It gives additional information about the structure and physical backscattering properties of the illuminated surface (reflectance and geometry). In this paper, the influence of different materials on the reflectivity was studied. The factors influencing material reflectivity were: laser wavelength, surface material type, surface colour and wetness. The measurements were focused on the materials used at buildings facades (wood, concrete and plaster). The measurements were performed by full-waveform terrestrial laser scanner (FW - TLS) VZ-400 and spectrometer ASD FieldSpec 4. The aim of this work was to find out what the differences in reflectance spectrum of used material were and whether the materials could be distinguished by their reflectance at 1550 nm (the laser wavelength of VZ-400).