Ing. Jerome HENRY
Directeur
HKD Géomatique SA, ONEX
Switzerland

Biography
Land surveying engineer graduate of the Ecole Supérieure des Géomètres et Topographes (F, 1999), I firstly improved my skills at the European Organization for Nuclear Research (CERN, 1999-2001) and then became successively engineer in two Swiss office in Geneva. I became director of the second one, HKD Geomatique SA in 2010. I'm also teaching topography to bachelor students at hepia.

Abstract
3D Modelisation of the Aerial Elements of Tramways and Trolleybus Lines in Geneve

Managing complex infrastructures is highly facilitated by modern GIS technologies. The aerial network of the public transportation lines is the kind of infrastructure for which it is sufficient to look up to appreciate the complexity. With this in mind and after several years of searching for a suitable solution , the office of surveyors HKD Geomatique SA was commissioned by the Service de la Mensuration Officielle ( SEMO ) and the Transports Publics Genevois (TPG ) for the acquisition and modelisation into a database of all the elements constituting the aerial network of the tram and trolleybus lines in Geneva. Following a successful feasibility study , the acquisition of field data was done through Trimble MX8 mobile mapping system. Equipped with two GNSS antennas , an inertial station and an odometer to calculate the trajectory, two laser scanners to measure point clouds and four cameras, this system has provided in four days the survey of more than 70 km of city streets. At this stage were obtained 400 Go of point clouds and over 326'000 pictures ready to be used as a basis for further work. The digitization of elements has then been made in 3D through Trimble Trident - 3D Analyst's tools. Each element , each line has been listed, positioned in 3D and classified according to a data model previously developed in collaboration with TPG before being exported to ESRI GIS world ( ArcGIS / ArcScene ). The various services of TPG (project, line maintenance , ...) will have a powerful tool to manage all their aerial installations. This complete and complex project is a fine example of solutions modern geomatic can provide to infrastructure managers.