Urban heat · Eco-Tech Hackathon · POWERFEM

GreenTrigger

Finds the hottest streets, then tells the city exactly where to plant.

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The gap

Cities see the heat but get no instructions.

Asphalt density, shrinking canopy, and climate change make urban districts hotter every summer. Existing tools visualise temperature; none of them say what to do about it, where, or in what order.

Who hurtsResidents of heat-stressed districts, vulnerable groups during heatwaves, and municipalities allocating greening budgets blind.

The blind spotNo real-time picture of which streets are critical, and no bridge between citizens who feel the heat and the officials who fund the fixes.

The originDeveloped by POWERFEM participants for this hackathon.

The solution

From heat map to planting plan.

GreenTrigger scores every district for heat risk and converts the score into a concrete greening action plan: detect, analyse, prioritise, recommend, report, improve.

01Score the districts. Surface materials, canopy cover, and density combine into a Heat Risk Score per neighbourhood.
02Generate the actions. "District A: risk 92/100. Plant 35 trees, create 2 shaded areas, reduce asphalt."
03Let citizens push. Residents report hot spots, request shade, and vote on priorities.
04Hand the city a report. Ranked investments, printable for the next council meeting.

Larnaca · district heat risk

coolercritical

31 48 57 28 74 92 61 44

District A · heat risk 92/100 Plant 35 trees, add 2 shaded areas, reduce asphalt on the school route.

Asphalt coverage78%

Canopy cover9%

Citizen hot-spot reports23

The one-day build

The full vision mocked, the workflow real.

The complete concept uses street sensors and satellite imagery. On hackathon day those are replaced entirely by a bundled mock dataset of 8 to 10 districts, and the recommendation engine is honest rule-based logic: score bands map to tree counts and shade actions.

✓District grid coloured by Heat Risk Score from mock data.
✓Click a district: score breakdown plus the generated action plan.
✓Citizen mode: report a hot spot and nudge the district's score.
✓Printable one-page municipality report view.

The 3-minute pitch

Hook: "Your city knows exactly where it's hottest. It still doesn't know where to plant the next tree."
Open the map, click the 92/100 district, and read the generated plan out loud.
File a citizen hot-spot report live: the score updates, the plan adjusts. Close the loop from resident to council budget.

Why it wins

Judges' scorecard.

Feasibility	Strictly mock-data with rule-based recommendations; ambitious vision, honest demo.
Impact	Directs municipal greening budgets to maximum-impact zones; heat kills, shade is policy.
User-friendliness	A colour-coded map plus plain-language actions; two modes, citizen and city hall.

SDG 11 SDG 13 SDG 15 Software only Sensors and satellite mocked

Next idea: BeachGuard AI →