Case Study: Vermessung AVT achieves centimeter-accurate alpine as-built mapping with Trimble Inpho Suite and MX7

How a multi-sensor data fusion approach tracks a new technique for alpine mapping

Vermessung AVT, an Austrian surveying firm, was contracted by ÖBB Infrastruktur to produce a high-precision as-built survey of the 40‑km Kundl–Baumkirchen railway corridor in the Alps. The brief required 2 cm horizontal and vertical accuracy over difficult alpine terrain—including 6 m noise-prevention walls, objects within 100 m of the tracks and a 600 m tunnel—so AVT needed to combine aerial and mobile mapping and fuse diverse data formats into a single deliverable.

AVT used a multi-sensor fusion workflow with Trimble Inpho Suite and a Trimble MX7 mobile imaging system: they established a 0.5 cm control network (30 GNSS receivers, 50 GCPs), collected 1,300 aerial images at 2 cm GSD and 20,000 MX7 panoramic images, and processed data with MATCH‑AT, OrthoMaster and OrthoVista to produce a 2 cm orthomosaic and a detailed 3D vector map. The datasets achieved ~1 cm orientation accuracy, were delivered in August 2017, received full approval from ÖBB, and opened new business opportunities and revenue streams for AVT.

Vermessung AVT

Klaus Legat

Head of Photogrammetry and Aerial Survey