From sensor
to BIM deliverable.

Before any site visit, we align on the precise project objectives: building type, area to be surveyed, expected deliverable (Revit, IFC 4.0, 2D drawings), level of detail (LOD 200 to 400), access constraints and construction schedule.

A preliminary visit is organized for complex missions: scanner anchor-point survey, identification of risk zones (fragile roofs, ceiling height > 8 m, cluttered interiors), validation of drone permits if needed (DGAC controlled zones, urban airspace, private overflight).

A detailed quote is sent within 48 business hours, including acquisition + processing + modeling + one revision iteration. No surprises mid-mission: everything is locked before kickoff.

The team operates with Leica BLK360 G2 scanner and DJI Matrice 4E + RTK drone. Indoors, the scanner is positioned on tripod every 6 to 10 meters depending on complexity — each station captures approximately 680,000 points per second on a 60-meter-radius sphere.

Outdoors, drone photogrammetry covers areas inaccessible from the ground: tall facades, roofs, inner courtyards, terrain. RTK guarantees absolute precision of ±3 cm on georeferenced images, with no dependency on manual control points.

Independent targets (flat and spherical 145 mm) are placed on critical zones to enable post-processing verification. Quality control runs live on tablet — if a station reveals a gap, we rescan immediately.

All scanner stations are assembled in Leica Cyclone Register 360. Registration uses both physical targets and cloud-to-cloud correlation — a double control that reduces loop-closure error to less than 2 mm on multi-story buildings.

The assembled cloud is georeferenced in Lambert 93 / NGF-IGN 69 (elevation), cleaned (passersby, vehicles, temporary furniture removed), and decimated by use case: high density (1 cm) for BIM modeling, light density (5 cm) for visualization.

A quantified technical report is generated: station count, total points, standard deviation on control targets, dimensions verified by total station. The raw cloud is delivered at this stage, without waiting for modeling.

From the georeferenced point cloud, the digital model is built in Autodesk Revit according to the LOD defined in phase 1. Walls, floors, openings, roof, load-bearing structure — every element is modeled within ±10 mm of the scan envelope.

For technical missions (industrial, MEP), network extraction is done by cloud reading: pipes, ducts, conduits, metal supports are modeled with their true dimensions and positions. Compatible with Revit MEP, Plant 3D, and IFC 4.0 export.

One iteration is included: annotations sent by email, field return for missing zones if justified, LOD adjustment or addition of specific families. The final deliverable is validated by internal double-check before handover.