Drones for surveying and mapping: surveys, ZICAD and data rules €15 See the guide
C-DRONE GUIDE · 5 OCTOBER 2026
Drone photogrammetry: the authorisation timeline
A photogrammetry campaign is nothing like a ten-minute photo flight: it covers a large footprint, places targets on third-party land, captures continuously and produces files that will circulate long after the flight. Each authorisation already exists on its own; what derails projects is the order in which they are requested, who handles them and who pays. Here is the full timeline, from D-60 to the release of the deliverables.
Published on 5 October 2026 — regulations in force as of September 2026.
Why photogrammetry changes the paperwork equation
Three features specific to photogrammetry make its administrative timeline longer and more fragile than that of a standard photo shoot. First, the footprint: a grid flight plan often covers several dozen hectares, spills onto neighbouring plots, crosses a road or a municipal boundary, and may clip a control zone (CTR) or a restricted area that a single flight over the centre of the site would have avoided. Second, continuous capture: the camera fires every two seconds over the whole area, with no selective framing possible; everything under the grid is recorded, including a sensitive perimeter at the edge. Third, the lifespan of the data: a point cloud or an orthophoto is passed to the engineering firm, the notary, the local authority, sometimes published — and each of those transfers is a legal act in its own right.
It is no coincidence that the reference review by Ismael Colomina and Pere Molina, published in 2014 in the ISPRS Journal of Photogrammetry and Remote Sensing, notes that drone photogrammetry methods "challenge the current aeronautical regulatory framework" and devotes a full analysis to regulatory status before even turning to sensors (see the study). Francesco Nex and Fabio Remondino, in their review of drone 3D mapping applications published the same year in Applied Geomatics, reach the same practical conclusion: regulation directly shapes the feasibility and cost of surveys (see the study). Ten years on, the French framework has changed — national scenarios abolished, ZICAD zones created, notification lead time doubled — but the principle holds: on a photogrammetry job, the paperwork is planned before the flight plan, not after.
D-60 to D-30: qualifying the framework before quoting
The first step happens when quoting, not when the order is placed. The operator overlays the exact survey footprint — ideally the polygon supplied by the client, not an address — on three layers: the UAS restriction map on Géoportail (CTRs, P, R and D zones, maximum heights), the ZICAD layer (France's prohibited aerial data capture zones), and land use (homes, roads open to traffic, public-access buildings). This overlay determines the flight framework, which drives the rest of the timeline:
- Unpopulated area, away from homes: open category, usually subcategory A3, no prefecture paperwork. Typical of a quarry, a farm plot or bare land on the outskirts.
- Footprint in a built-up area or close to third parties: European standard scenario STS-01 (visual line of sight, 120 m maximum, class C5 drone, controlled ground area) and prior notification to the prefect through AlphaTango, at least 10 working days before the flight.
- Large linear or beyond-visual-line-of-sight footprint (road alignment, dyke, corridor): STS-02 if conditions are met, otherwise a DGAC authorisation based on a SORA risk assessment or a predefined PDRA scenario — several weeks to several months of processing, to be started at D-90 or earlier.
This diagnosis also reveals the parallel steps: agreement from the air traffic unit if the footprint touches a CTR (a few days at an AFIS aerodrome, several weeks at a major airport), a ZICAD exemption if a protected perimeter falls within the grid, and a road-occupation permit if the take-off base or targets sit on the public highway. Each has its own rules, detailed in our guide to France's prohibited aerial data capture zones (ZICAD) and in the one on prior notification of flights over populated areas. The point specific to photogrammetry: you can often trim the grid to stay out of a ZICAD or a more constrained zone, at the cost of less overlap at the edges. That trade-off is agreed with the client at quoting stage, not discovered during processing.
D-30 to D-10: land, targets and roads
This is the phase timelines most often forget, because nothing about it is aeronautical. Centimetre-grade photogrammetry relies on ground control and check points — targets laid on the ground and measured by GNSS — spread across the whole footprint, including its edges, and therefore often on neighbours' land. Placing a target on a private plot means entering it: you need the consent of the owner or the farmer, ideally in writing, with the date and length of presence. Taking off from private land likewise requires its owner's agreement. On a footprint touching ten plots, this easily takes two to three weeks, and it is the project owner — who knows the neighbours and often already has their details — who obtains it fastest.
If a target, a vehicle or the take-off base occupies a public road, a parking permit (cerfa 14023) is needed from the road manager, plus a temporary traffic order (cerfa 14024) if traffic has to be altered. Processing can take up to two months: on a road survey, this lead time becomes the critical path of the whole project. Finally, if the site is an operating facility — logistics platform, factory, construction site — its prevention plan or safety coordination comes on top, with its own notice period.
The prior notification to the prefect, when required, must be filed at least 10 working days before the flight — around D-15 in calendar days — with a window of several days to absorb a weather postponement. For a repeated campaign (monthly earthworks monitoring, stockpile survey), a single notification can cover several flights over a period, which lightens later campaigns.
After the flight: processing, ZICAD check and release
On a photogrammetry job, the obligations do not end at landing. Article L. 6224-1 of the French Transport Code does not only prohibit capturing a ZICAD: it also covers recording, transmitting, storing, using and disseminating the data. In practice, three checks are needed at processing. First, verify that the raw images and the orthophoto do not spill onto a protected perimeter — a grid trimmed at quoting stage can still capture an edge through the oblique field of view. If so, discard the images concerned and clip the deliverables before anything is sent. Second, deal with personal data: faces, number plates and private gardens visible on a 2 cm/pixel orthophoto fall under the GDPR, and blurring or reducing resolution is agreed with the client according to the intended use, as explained in our guide to GDPR and anonymising drone data. Third, set the dissemination rules by contract: a point cloud intended for an engineering firm is not in the same situation as an orthophoto published on a local authority website or attached to a public inquiry.
The dissemination clause protects both parties: the operator, who no longer controls the files once delivered, and the client, who might in good faith publish an image covering a protected zone. It sets the permitted uses, the intended recipients, the publishable resolution and the obligation to consult the operator before any wider publication. The data should also be stored traceably (date, footprint, flight plan) to answer any later inspection.
Who does what, who pays: the usual split and 2026 prices
The administrative steps are almost all free; what is billed is preparation time and the lead times they impose. The healthiest split, as seen on jobs for land surveyors and engineering firms:
| Step | Handled by | Typical lead time | Paid by |
| Flight framework check, map, ZICAD | Operator | At quoting | Included in preparation |
| Prior notification (STS-01) | Operator | 10 working days min. | Included |
| CTR agreement | Operator | A few days to several weeks | Included, lead time to plan for |
| ZICAD exemption | Operator, with client documents | Several weeks | Flat preparation fee |
| Owner consents, access to plots | Client | 2 to 3 weeks | Client |
| Roads (cerfa 14023/14024) | Client or mandated operator | Up to 2 months | Any fee: client |
| SORA/PDRA authorisation | Operator | Weeks to months | Dedicated quote line |
Ranges observed in France in 2026, excluding VAT: €150 to €400 of regulatory preparation for a simple survey in an unpopulated area; €300 to €700 with prior notification and a CTR agreement; €400 to €900 to prepare a ZICAD exemption or a road file; a full SORA file runs into thousands of euros and is only justified for a recurring or large-scale campaign. Flight time and processing come on top, depending on area and required accuracy.
The paid guide Drones for surveying and mapping: surveys, ZICAD and data rules turns this timeline into printable checklists, with template dissemination clauses and landowner consent forms. For a specific project, request a quote with the footprint polygon, the required accuracy and the deadline: that is what lets the timeline be built backwards from the very first reply.
Frequently asked questions
Who files the requests: the client or the drone contractor?
Aviation paperwork (prior notification, CTR agreement, specific-category file, ZICAD exemption) is filed by the operator, the only holder of the AlphaTango number. Land agreements, access to plots and road paperwork fall in practice to the client or its project manager, who knows the owners and managers. The contract should spell this out.
Can an orthophoto already delivered become illegal to share?
Yes, if it covers a ZICAD without an exemption: article L. 6224-1 of the French Transport Code also covers storing, transmitting and disseminating the data. Posting the orthophoto on a portal or attaching it to a public file prolongs the offence. Hence the value of a ZICAD check at processing, before delivery, and of a dissemination clause in the contract.
Put it into practice
- Drone surveying & photogrammetry: rates and cities covered from €800
- Surveying & photogrammetry in Béziers Occitanie
- Surveying & photogrammetry in Cannes Provence-Alpes-Côte d'Azur
- Surveying & photogrammetry in Bourges Centre-Val de Loire