SURFACE LASER SCANNING IN

GEODESY

Presentation by Yulia Loktionova, Moscow State University of Geodesy and Cartography

Surface laser scanning in geodesy

Is the newest technology in area of applied geodesy, which pretends to be the most operative method of obtaining the information about the probed object

The surface laser scanning is also known as ‘terrestrial’ or ‘ground-based’ scanning

Fields of ApplicationIn civil engineering• Deformation monitoring of

facilities under construction• Reconstruction of engineering

structures (bridges, tunnels, overpasses etc.)

• Support at the stage of design and installation of facade structures

In architecture• Facade shooting of architectural

and historical heritage buildings and structures for the purpose of creation of measurement drawings and three-dimensional models for repair and restoration work

Measurement technologies1. Impulse-based method: the distance between the

scanner and the object is determined on the time a pulse of light needed to travel the way to the object and back

Distance = 0,5tv

2. Phase-difference method: the scanner automatically defines a number of modulated waves, not a distance

Aerial laser scanningProduces • Digital terrain models• Digital elevated models• Topographic maps

But this technology is several times more expensive and is suitable for a large-scale shooting only

Advantages of the surface laser scanning

• The ability to determining spatial coordinates of the object in the field condition

• A real time three-dimensional visualization• Guaranteed safety for a shooting implementer while

scanning• A possibility of night-time shooting due to features of

component’s operation principle• Inexpensive method

Example of laser scanners

These three models are the most popular laser scanners on the Russian market of geodesic equipment: LEICA SCANSTATION C10 (Switzerland), TOPCON GLS-1000 (Japan), TRIMBLE GX (the USA)

Main TermsSurface laser scanning Horizontal/vertical anglesMeasurement Laser beamGeodesic surveys Impulse-based methodData acquisition Phase-differenceSpatial coordinates Aerial laser scanningCartesian coordinates Large-scale shootingPhoto-theodolite Digital elevated modelPhotogrammetry Digital terrain modelReflectorless rangefinder Field condition

Sources

http://global.britannica.comhttp://inno.tpu.ru/en/projects/inform/surface-laser-scanning-sls.htmlhttp://www.3dlasermapping.comhttp://www.zemlemer.org/enghttp://ecogeotec.ru/en/technology/aerial-laser-scanninghttp://www.leica-geosystems.ushttp://en.m.wikipedia.org/wiki/3d_laser_scanning

Honor of Statement

This review was written by me. I know that violations of that policy may result in my being dismissed from Moscow State University of Geodesy and Cartography and/or appropriate legal action being taken against me

SignedYulia Loktionova03/04/2015