C‑DRONE
Top-down orthophoto-style view of farmland parcels captured by drone

🗺️ SURVEYING & PHOTOGRAMMETRY · LORIENT (56) · €800–3,000 PER DAY

Drone surveying & photogrammetry in Lorient

Drone photogrammetry turns a few hundred aerial photos into precision survey products: georeferenced orthophotography at 1–3 cm/pixel, digital surface and terrain models, 3D point clouds, contour lines, stockpile and earthworks volume calculations. With an RTK/PPK drone and ground control points measured by centimetre-grade GNSS, accuracy reaches 2 to 5 cm both horizontally and vertically — sufficient for most development studies, at a fraction of the cost of an exhaustive ground survey.

We cover from 1 to several hundred hectares per day depending on the required resolution, including hard-to-access sites: working quarries, landfills, riverbanks, industrial wasteland. Deliverables come in your coordinate system (Lambert 93 / RGF93, conic conformal projections) and standard formats (GeoTIFF, LAS/LAZ, DXF, GIS formats). Chartered surveyors, civil engineering offices, quarry operators and local authorities are regular clients.

Free quote — surveying & photogrammetry in Lorient

Rates

€800–3,000 per day — the range observed on the 2026 French market, including regulatory preparation, flight and delivery. The exact quote depends on the site, the deliverable and the airspace context in Lorient.

Common use cases

The local context in Lorient

Born of the French East India Company, Lorient lives facing the sea: the Keroman submarine base, Europe's largest 20th-century fortification, now hosts Lorient La Base, a world hub of ocean racing (the Éric Tabarly sailing museum, Ultim trimaran teams). Flying here is tricky: Lann-Bihoué naval air station (LFRH) covers the west of the conurbation with military zones, the arsenal and Naval Group facilities are no-fly, and Keroman fishing port — France's leading fishing port by value — remains a sensitive site.

The Interceltic Festival, drawing nearly 750,000 visitors each summer, triggers temporary bans. Local drone missions: communication for sailing teams, monitoring of private shipyards, port infrastructure inspection (with protocols), real estate and tourism over the harbour and Groix island.

Applicable regulations

Survey flights mostly take place outside built-up areas, in open category A2 or A3 (photogrammetry drones weigh 900 g to 6 kg) flying automated grid patterns below the regulatory 120 m. Long corridors or populated sites fall under the specific category (STS-01/STS-02, or an operational authorisation for BVLOS on long corridors). The operator is registered on AlphaTango and checks regulated zones on Géoportail: quarries and industrial estates are often near airfields or under military low-altitude training routes (RTBA), requiring protocols or time slots. Legally binding georeferencing (enforceable boundary plans) remains the exclusive remit of chartered surveyors, with whom we work as subcontractors.

Frequently asked questions

What accuracy can a drone survey guarantee?

With an RTK drone and ground control points, we guarantee 2 to 5 cm XYZ accuracy, verified against independent checkpoints whose residuals are documented in the processing report.

Does a drone survey replace a chartered surveyor?

No for legally binding documents (boundary demarcation, land division): that is the chartered surveyor's legal monopoly. Yes for technical studies: our deliverables feed directly into civil works design, volume calculations and environmental studies.

Does vegetation interfere with photogrammetric surveys?

Yes: photogrammetry measures the visible surface, so the canopy rather than the ground beneath. For wooded areas, we offer drone LiDAR, which penetrates vegetation and reconstructs the bare terrain.

Can this service be flown anywhere in Lorient?

Almost: Zones militaires de la base aéronautique navale de Lann-Bihoué (LFRH); Emprises interdites de l'arsenal et de Naval Group; Interdictions temporaires pendant le Festival interceltique. Depending on the exact location, the pilot picks the right framework (open or specific category) and files the required declarations — included in the quote.

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