Dr. Julien Vallet
CEO
Helimap System SA
Switzerland

Biography
Director of Helimap System SA, since 2008.
R&D and airborne mapping at Ulrich, Wiesmann + Rolle AG, from 2003 to 2007. PhD and PostDoc at EPFL (Ecole Polytechnique Fédérale de Lausanne) at the IPHOT (Photogrammetry Laboratory)from 1997 to 2002.

Abstract
Integration of Airborne, mobile and static terrestrial LiDAR for High accuracy highway mapping

Swiss highways maintenance planning (U-Plans) requires a complete mapping of the existing lanes, related objects and a buffer of 50-100m at each side of the road. Since 2009, Helimap System has been involved with federal authorities to provide a non invasive technique to provide such type of data with high level of accuracy: 2cm in Z and 3cm in XY.
Based on low altitude airborne mission (<100m AGL), it was possible to achieve such accuracy level with a point density of ~150-200pt/m2 and orthoimagery with pixel size of 2cm. If airborne data is really suitable for Swiss alpine environment (alpine), it is not possible to map tunnels or lower part of bridges. That has to be done after by static which require raod closure. The following paper describes how we fill this gap using the 3 Lidar techniques to provide a complete set of data combining the best of each on an existing highway. High bridges are scanned with static stations, lower part of bridges above or below highways and details of the pavement and objects (signs, electrical boxes…) are scanned with mobile scanners and Airborne cover all the rest and serves as reference to fit mobile in poor GPS sections.