🗺️ SURVEYING & PHOTOGRAMMETRY · BLOIS (41) · €800–3,000 PER DAY
Drone surveying & photogrammetry in Blois
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 Blois
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 Blois.
Common use cases
- Topographic survey of land ahead of a development or subdivision project
- Stockpile volume measurement in quarries or recycling platforms
- Centimetre-grade orthophoto of a municipality for its GIS
- Digital terrain model for hydraulic or flood-risk studies
- Erosion monitoring of riverbanks, dunes or coastal cliffs
- 3D modelling of a building or monument for a digital twin
The local context in Blois
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). Typical drone missions: tourism promotion (with authorisations), real estate, construction monitoring, agricultural and vineyard imaging of the Blésois, structure inspection on the Loire.
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 Blois?
Almost: Zone interdite de la centrale nucléaire de Saint-Laurent-des-Eaux en amont; Aérodrome de Blois-Le Breuil (LFOQ); Domaine national de Chambord à proximité (survol soumis à autorisation). Depending on the exact location, the pilot picks the right framework (open or specific category) and files the required declarations — included in the quote.
Other drone services in Blois
- Aerial photography in Blois from €300
- Aerial video in Blois from €500
- Real estate drone services in Blois from €250
- Weddings & events in Blois from €400
- Roof inspection in Blois from €200
- Facade inspection in Blois from €300
- Aerial thermal imaging in Blois from €500
- Construction site monitoring in Blois from €250
- Precision agriculture in Blois from €8
- Security & surveillance in Blois from €600
- Immersive FPV video in Blois from €700
- High-access cleaning in Blois from €500
- Drone pilot training in Blois from €350
- All services in Blois
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