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C-DRONE GUIDE · 3 AUGUST 2026

Cool schoolyards and playground de-paving: the drone thermal and canopy audit, method and price

In midsummer, the surface-temperature gap between a tarmac playground and a shaded, planted corner can exceed 15 to 20 °C — exactly when children are playing there, at the hottest point of the day. "Cool schoolyard" and de-paving programmes, backed by France's Fonds vert and run by many municipalities, intermunicipal bodies and départements managing secondary schools, replace asphalt with permeable ground, trees and shaded areas. For the elected official or technical department having to choose which of twenty playgrounds to treat first, two questions remain: which is most urgent, and did the works actually deliver once finished? A thermal drone flight, paired with a canopy reading, answers both in a single outing.

Published on 3 August 2026, reviewed on 10 August 2026 — regulations in force as of August 2026.

What a thermal flight and a canopy reading show

The flight is best flown in early afternoon, when the sun is high and the gap between surfaces is at its widest. The onboard thermal camera produces a surface-temperature map of the whole playground: dark asphalt in the sun, sand or stabilised ground, shade cast by trees and covered walkways, permeable surfaces already laid. A visible-light pass adds a canopy reading: the share of the yard actually shaded at midday break time, distinct from the planted area shown on the plan — a newly planted tree shelters no one for several years.

The stakes for children are documented: a 2020 study by Antoniadis, Katsoulas and Papanastasiou published in the journal Atmosphere notes that pupils spend nearly a third of their school time in the playground and are physiologically more heat-sensitive than adults, making schoolyard thermal design — natural and artificial shade, light-coloured surfacing — a health issue and not merely a comfort one (see the study on Google Scholar).

Prioritising a school estate, then proving the works paid off

For a municipality or département managing dozens of schools, a comparative flight over several playgrounds in the same campaign gives an objective ranking — peak temperature recorded, shaded share, exposure — to prioritise which cool-schoolyard projects to schedule, rather than working through them by building age or parent-association pressure. This mapping pairs naturally with the audit of school-estate roofs and the municipal tree inventory, often commissioned under the same estate-management logic, and extends to playground scale the approach already described for urban heat islands at neighbourhood scale.

Once de-paving works are done — permeable ground, trees, shade structures — a second flight under matching conditions (same solar hour, same season) proves the effect: a before/after temperature gap in degrees, a shaded-area gain in square metres. Those figures, presentable to the council or to parents, often carry more weight than a simple before/after photo when justifying the spend and the next batch of playgrounds to transform.

This kind of audit also has a place in the project's funding case: cool schoolyards are one of the operations eligible for France's Fonds vert under renaturation and climate-change adaptation, and a quantified baseline — rather than a qualitative description — makes both the grant application and its follow-up easier to process. De-paving a playground also counts towards a municipality's de-artificialised surface area, an indicator closely tracked since the zéro artificialisation nette (net-zero land take, ZAN) target; the map produced by the drone flight, with its before/after measurement of permeable surface, serves that purpose directly.

A simple technical flight, prepared with children in mind

Technically the mission stays simple: a schoolyard rarely covers more than one or two hectares, and a flight of a few dozen minutes covers it in both thermal and visible light. The regulatory framework is that of any flight over a built-up area — see our guide on prior notification for a flight in a populated area — and the flight is best scheduled without pupils present (Wednesday afternoon, a weekend or school holidays), which simplifies both safety and children's privacy; our guide on overflying people and private property details that framework. The drawback is that an empty yard does not reflect real use; in practice, the temperature map and canopy reading stay perfectly valid without children present, since the heat of the asphalt and the shade of the trees do not depend on break time. Where a school still wants occupied-yard footage for communication purposes, a short separate pass during break time can be added to the same visit, kept strictly to wide shots with no identifiable close-ups.

Three-dimensional drone thermal imaging applied to public spaces is an active research field: a study by Alkaabi, Senghore and Rhman El Fawair published in 2022 in Frontiers in Built Environment describes using drones to 3D-map the thermal environment of buildings and pedestrian spaces, in support of more heat-resilient urban planning (see the study on Google Scholar) — the same logic applies, at playground scale, to guide design choices.

Deliverables and 2026 prices

The typical deliverable combines an orthophoto of the yard, a georeferenced surface-temperature map and an effective-canopy indicator at midday-break time, with a note ranking the areas to treat first. Orders of magnitude observed in France in 2026 (excl. VAT):

Files are delivered in formats the parks-and-gardens department or the design office can use directly (georeferenced GeoTIFF, GIS-compatible export), with no proprietary software required. The service sits within our thermal imaging and aerial mapping offer; request a quote stating the number of schools, playground area and whether a cool-schoolyard project is already under way or still being scoped.

Frequently asked questions

Do we need to wait for the trees to grow before flying a check-up?

No. The temperature map changes as soon as permeable surfaces and artificial shade structures (canopies, covered walkways) are in place, so an immediate post-works check makes sense. Shade cast by young trees only becomes significant after several years, so a medium-term follow-up usefully complements that first check.

Can the flight happen during school hours, with pupils present?

That is not recommended. The mission is scheduled without pupils present — Wednesday afternoon, a weekend or school holidays — to simplify safety and privacy; the heat and canopy map stays perfectly valid without children in the yard.

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Put it into practice

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