Assessment of Terrestrial Laser Scanner against Different Surveying Techniques.( Dept. C)

Terrestrial Laser Scanner (TLS) has become a familiar instrument to be used in wide range of engineering application. It can for the rapid capture accurate and highly detailed 3D point cloud datasets. The advantage laser scanner is that it record huge number points short period time. main idea this contribution assesses accuracy TLS relative other traditional surveying instruments. This done throughout four different case studies. In all studies coordinates, obtained using total station (TS) are assumed reference coordinates. First, control network, consists nine points, measured TS, TLS, real time kinematic global navigation satellite system (RTK-GPS). precision each investigated considering standard deviation (SD) measurements. addition, RTK-GPS measurements RMS. Secondly, grid levelling 30,000m2 ground terrain was performed TS TLS. After words, RMS computed 5mx5m generated from both surfaces; formed measurements.  Thirdly, effect incidence angle on assessed by measuring fifty-six fixed building facade incident angles. Those were then absolute height differences between calculated figure out decreasing fourth study, steep-vertical cut downhill area 500m2 calculated. Finally, based results, found produces higher vertical than networks. about 5cm. Moreover, not preferable less 45 degrees as degrades significantly after value. measurements, almost 6mm discrepancies with lower measurement period. Eventually, despite fact more expensive techniques, beneficial terms effort saving. acceptable ranges surveyed data.