Drone photogrammetry in France: flight plan to checked deliverable

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October 2026latest revision of this guide

• Primary sources: Légifrance, EUR-Lex, Géoportail, DGAC.
• Every figure linked to its source, dated in the last chapter.
• Dated updates: you always read the latest version.

Who it is for

• Surveyors and survey firms, French or foreign, adding drones to their work in France and needing a repeatable, checked method
• Professional drone operators selling orthomosaics, terrain models, point clouds or volumes in France who must defend their accuracy
• Engineering consultancies, earthworks contractors and quarry operators who produce or receive surveys in-house
• Project owners and international clients commissioning a survey in France who need to write a tolerance and check it

In pictures

Illustrative photos, published by their authors under free licences.

Contents of the complete guide

1. Photogrammetry or not: the decision table before any flight plan (free extract below)
2. GSD and flying height: the formula and full calculations
3. The flight plan: overlaps, lines, timing, nadir, oblique and façades
4. Georeferencing: French legal system, ground control, check points, RTK and PPK
5. Preparing the mission: the flight rules on one page, and where to read them
6. Acquisition on site: light, wind, settings and checklist
7. Processing: the generic chain and its hold points
8. Accuracy checks: RMSE, the French 2003 accuracy classes, ASPRS standards
9. Deliverables, formats and processing report
10. Volumes: how to compute them, and their limits
11. Common mistakes, from quote to delivery
12. Six templates to copy
13. Sources and consultation dates

Included: 19 checklist items and 19 decision or reference tables.

Introduction

A drone photogrammetry survey rarely fails on processing day. It fails earlier: a flying height chosen out of habit that misses the promised resolution on sloping ground, overlaps too tight along a wood, a purely vertical flight plan that makes the model bulge in the middle, ground control points all lined up along the access road, no independent check points, heights delivered above the ellipsoid instead of in the French levelling datum. The software still produces a sharp orthomosaic and a flattering report. The error only shows when the surveyor overlays the survey on their plan, when the engineer computes a volume, or when the client compares two campaigns.

This guide sets out the complete method, from choosing the sensor to signing the delivery record, for a survey flown in France. It is written for those who produce surveys (drone operators, surveyors, quarry and contractor teams) and for those who commission and must check them, including foreign firms working to French requirements. Each step is worked through with the actual calculation (flying height, photo base, line spacing, motion blur, accuracy class thresholds), and it ends with six templates ready to fill in.

The guide is up to date as of 31 October 2026: texts reread on that date, studies checked through their DOI. The legal side of the trade (ZICAD data-capture bans, large areas, data ownership) is covered by the "Drone surveying and mapping" trade edition; managing construction monitoring as a client is covered by the "Construction monitoring by drone" guide.

Photogrammetry or not: the decision table before any flight plan

What photogrammetry actually measures

Photogrammetry measures no distances. It finds the same details in hundreds of overlapping photos taken from different positions, and computes from them the position of each camera station and the 3D position of each detail. Everything it produces follows from that: a point only exists in the model if it is visible, textured and seen from at least two positions (in practice many more).

Three practical consequences:

• It sees the surface, not the ground under vegetation. Under trees or tall scrub, the model shows the top of the canopy. A digital terrain model (DTM) under woodland is not a photogrammetric deliverable.
• It needs texture. Plain metal roofing, smooth render, water, snow, glass or fresh uniform asphalt give few matching points, hence holes or noise.
• It needs stable light. Moving shadows, passing clouds and backlight change the look of the same surface from one image to the next and degrade matching.

In return, one flight yields an orthomosaic, a surface model and a textured 3D model with an ordinary camera. On well-textured mineral surfaces (quarries, earthworks, roads, tiled roofs, stone façades) it is often the most economical route to checked centimetre-level accuracy.

The decision table

The site's free guides cover the two most common trade-offs: drone LiDAR or photogrammetry and drone photogrammetry or terrestrial laser scanning.

The four values to fix before talking about drones

A survey is defined by four values, written down before the first flight; confusing them is behind most disputes.

1. Ground sampling distance (GSD): the size of one pixel on the ground. It decides what detail is visible. It says nothing about position.
2. Target accuracy, separately in planimetry (x, y) and height (z), measured on independent check points. It decides what can be measured.
3. The coordinate reference system, in three parts: geodetic system, map projection, height datum. It decides what can be overlaid.
4. Deliverables and formats: orthomosaic, point cloud, DSM, DTM, mesh, drawing, volumes. They decide what the client can open and use.

A fine GSD does not imply good accuracy, and good accuracy is useless in the wrong system. To fix them, ask the client one question first: "What will you measure or decide with this file, and in which software?" The rest of this guide takes the four values in the order they come up on site.

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Frequently asked questions

What does “Drone photogrammetry in France: the method, from flight plan to checked deliverable” contain and how much is it?

For €39 VAT included (€32.50 excl. VAT), you get drone photogrammetry in France: the method, from flight plan to checked deliverable: 12 chapters online, about 31 printable A4 pages and 6 ready-to-copy templates, to produce or commission a drone photogrammetry survey in France that delivers what it promises: decide whether photogrammetry is the right sensor, work out flying height from the required ground sampling distance, set overlaps and camera angles, georeference in the French legal reference system (RGF93, Lambert-93, NGF-IGN69) with ground control points, independent check points, RTK or PPK, run acquisition and processing, measure accuracy on check points against the French accuracy classes of the Order of 16 September 2003 and the ASPRS standards, and deliver the right formats with a verifiable report.

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Yes: Stripe generates the invoice and emails it. You can enter your company name and VAT number at checkout. Seller: Lacangel Group (VAT FR21995268018); prices VAT included.

Is the guide kept up to date?

Yes. The guide's page is updated when the rules change; your access stays valid and you always read the latest version.

Which texts is the guide based on?

On the official texts in force (EU regulations, French decrees and codes), cited and dated with their links: you can check every rule at its source, which is authoritative. C-DRONE is an independent publisher.

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• Drone photogrammetry: how much does a 3D model cost?
• Ground sampling distance (GSD) in drone photogrammetry: choosing it project by project, price
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• Checking a Drone Photogrammetry Deliverable: Processing Report, Check Points, Tolerances
• Drone photogrammetry deliverables: orthophoto, DSM/DTM, point cloud, 3D mesh
• Drone photogrammetry software: 2026 comparison (free and paid)

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