IAAC × Infrared City Hackathon 2026

See the heat
before it kills.

HeatGuard is a real-time thermal comfort decision tool for outdoor festivals. It maps who is at heat-stroke risk, where — and tells you exactly where to place shade structures to save the most lives.

Infrared SDK · Open-Meteo · OpenStreetMap · Mapbox
The evidence

Heat is already
killing crowds.

Heatwaves are the deadliest extreme weather event in Europe. Festivals are ground zero — open sky, no shade, peak sun, maximum crowd density.

61,000
excess deaths · 2022 European heatwave · more than all other weather disasters combined
41°C
UTCI heat-stroke threshold · physiological limit reached in under 20 min of full sun exposure
−9°C
UTCI drop a targeted shade structure delivers · moves people from danger to safe
How it works

Physics-based heat mapping,
cell by cell.

Temperature alone doesn't tell you who's at risk. HeatGuard computes UTCI — the Universal Thermal Climate Index — a WHO-referenced metric that models the human body's actual heat load.

①
Weather — Open-Meteo API
Hourly dry-bulb temperature, relative humidity, wind speed & direction, direct + diffuse solar radiation for the exact festival dates.
②
Thermal comfort — Infrared SDK
Infrared's UTCI engine runs a full outdoor comfort simulation at 5 m resolution across the festival site, accounting for building shadows and solar geometry.
③
Surface correction — OpenStreetMap albedo
Every cell's UTCI is corrected for ground material. Asphalt (+5.5°C), concrete (+3.5°C), gravel (+2°C), metal (+6.5°C) — all scaled by real-time solar intensity.
④
Shade placement — sliding-window optimisation
A 25 m² window slides across 1,800+ candidate positions. Each is scored by how many cells it moves from above the 41°C stroke threshold to below it. Top 20 positions are recommended.
What drives the recommendation

Every placement weighs
10 independent factors.

✓
UTCI thermal comfort
Infrared SDK · physiological felt-temperature per cell
✓
Surface material albedo
Asphalt +5.5°C · concrete +3.5°C · gravel +2°C · metal +6.5°C
✓
Solar radiation intensity
Open-Meteo GHI · surface heat scales to zero at night
✓
Building shadow geometry
92 OSM structures · height-accurate shadow casting
✓
Tree canopy
1,859 trees · woodland polygons sampled at 14 m spacing
✓
Crowd density (stage proximity)
Inverse-distance weighting from 7 stage locations
✓
Wind safety threshold
Placements flagged if peak wind > 8 m/s · structure collapse risk
✓
Festival boundary
40-vertex OSM island polygon · water cells excluded
+
Pedestrian flow (path network)
OSM highway graph · dwell probability per segment
+
Shade structure cost optimisation
Fewer large vs. more small — min fabric per person protected
Ready to analyse

Donauinselfest
2026

Vienna · Donauinsel · 26–28 June 2026 · 250,000 visitors · 5.4 km strip

Fetching hourly weather from Open-Meteo for Jun 26–28
Running Infrared UTCI model at 5 m resolution across 45,000+ cells
Applying surface albedo correction (asphalt, gravel, concrete, metal)
Ranking 1,800+ shade placements by stroke-risk reduction

Select a festival

Choose an event to run the full thermal comfort analysis. Risk projections are calculated from real weather forecasts.

Donauinselfest
Vienna, Austria · Donauinsel · Jun 26–28, 2026 · 4.5 km festival strip
250,000
visitors
161k+
at stroke risk (peak)
+20
structures recommended
Critical risk
→
Glastonbury Festival
Somerset, UK · Jun 25–29, 2026 · 210,000 capacity
210,000
visitors
Coming soon
Untold Festival
Cluj-Napoca, Romania · Aug 7–10, 2026 · 350,000 capacity
350,000
visitors
Coming soon

Analysing Donauinselfest

Real-time thermal comfort pipeline ·

Loading…
—
people at heat stroke risk
UTCI >41°C · immediate danger
—
at heat exhaustion risk
UTCI >35°C · medical attention needed
+—
protected after shade intervention
−9°C under structure · from danger to safe
Event hour 14:00
12:0015:0018:0021:0023:00
Forecast · Open-Meteo
Data sources
Weather (Open-Meteo live)
Fetching island boundary…
Buildings — loading…
Trees — loading…
Top shade placements
Click to place vertices · Double-click to finish