What we do
Terrestrial Laser Scanning (TLS)
Since its inauguration, the LVML acquires 3D Landscape data with the technique of 'terrestrial laser scanning' (TLS). The measurement of the landscape with such systems allows the generation of highly detailed digital height models (DHM) which can be used as a basis for realistic 3D visualisations, accurate topography modellings and CNC based processing for the generation of physical models, among other functions.
The universally applicable measuring method TLS has made its breakthrough in several fields of science in the last few years mainly thanks to the relatively modest acquisition costs and dimension of the equipment: architecture and landscape architecture (prefabrication of building parts or observation and visualization of landscape developments), geography (volume calculations and material movement), archeology (measurements of dig sites), mining industry (cutback volumes and site remediation), geology (identification of exposed geological structures) and geodesy (autonomous navigation) to name just a few fields.
The use of a terrestrial laser scanner relies on a moderate user expertise and the use of specialized hard- and software. Besides the necessary expert knowledge - for example about reflection properties of the laser on the object - main focuses of interest are the distance, resolution and scan position. The speed of the technique can vary based on individual characteristics of the site, each individual site requires a strategy to minimize the scanning time and maximize the accuracy and even density of the scanned result
True color point cloud of Science City (Anim.: ILA)
Normally, with the TLS one measures on a fixed scan position from which the laser beam passes over the landscape by mirrors (vertical deflection) and rotation of the scan unit (horizontal deflection). By sweeping the landscape in this way (scanning) a highly precise 3D point cloud is produced in a reference coordinate system given by the scanner. In combination with a photo camera mounted on the scan unit, the point clouds can be colored textured by the photos taken during the scan. The GPS-/GNSS localisation of the scanner allows furthermore the precise determination of the position of the TLS and with it an exact localisation of each scan point delivered in national coordinates.
The interdepartemental LVML of the chair of Prof. Christophe Girot at the institut of landscape architecture (ILA) and the Chair of Prof. Adrienne Grêt-Regamey, planning of landscape and urban systems (PLUS) at the institute for spatial and landscape planning (IRL) are applying these methods/techniques successfully in teaching and research.