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

🗺️ SURVEYING & PHOTOGRAMMETRY · BLOIS (41) · €800–3,000 PER DAY

Drone surveying & photogrammetry in Blois

Free quote — surveying & photogrammetry in Blois

In Blois, drone surveys support projects along the Loire: banks, flood zones, bridges and land awaiting development. Centimetre-grade orthophotos replace days of ground survey work. In Blois as across the department (41), a local pilot travels with the equipment the mission requires — free quote within one working day.

Prefecture of Loir-et-Cher, Blois terraces its old town between the Loire and its royal château, residence of seven kings and ten queens of France, famous for its François I staircase. The city lies within the UNESCO-listed Loire Valley: flights must reckon with this protected landscape, Blois-Le Breuil aerodrome (LFOQ) to the north-west, and the proximity of Chambord — whose national estate is off-limits without express authorisation. The Saint-Laurent-des-Eaux nuclear plant, 15 km upstream, imposes its prohibited zone. The Blois economy combines château tourism, pharmaceutical and cosmetics industries, and agriculture (Sologne strawberries, Cheverny and Touraine vineyards).

What the service covers in Blois

Sites and landmarks in Blois

These sites in Blois anchor the flight plans and the framing:

Rates

€800–3,000 per day — the range observed on the 2026 French market, including regulatory preparation, flight and delivery. Pricing reflects the conditions in Blois: area, access constraints, any authorisations and the delivery format.

Airspace and formalities in Blois

A photogrammetric survey in Blois covers the site in parallel flight lines: inside the restricted perimeter (Zone interdite de la centrale nucléaire de Saint-Laurent-des-Eaux en amont), the authorisation must describe that grid precisely — a technical file we prepare as standard.

Photogrammetric surveys fly in the open category over controlled sites, on automated grids below 120 m; urban footprints or sites crossed by third parties move to the specific category with a declaration. Full regulations and rates: surveying & photogrammetry across France →

Information checked against the regulations in force as of August 2026 (EU regulations 2019/945 and 2019/947, applicable French decrees).

Frequently asked questions

Surveying & photogrammetry in Blois: what budget should you plan?

Allow €800–3,000 per day — the 2026 French market range, including regulatory preparation, flight and delivery. Build the overflight-authorisation lead time for Blois into your schedule: several weeks depending on the case.

What accuracy can a drone survey achieve in Blois?

With GNSS-measured ground control points, the orthophoto and point cloud reach 2–5 cm planimetric accuracy — enough for a preliminary design survey. For legally binding documents we work under a partner chartered surveyor covering Centre-Val de Loire.

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.

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