Namur - Full Color Thermography

Aerial thermography by infrared scanner is a technique that makes it possible to measure and illustrate the "radiative flux" emitted by overflying roofs. Thanks to these radiative fluxes, it is possible, under certain conditions, to estimate the extent of thermal losses from roofs. The thermography therefore gives an indication of the insulation status of the roofs. A plane equipped with an infrared scanner flew over the town during the nights of 16 to 17 and 23 to 24 February 2018. For the data to be correct, several conditions had to be met (good visibility, clear skies, humidity of 80%, temperatures between -5°C and -3°C, wind from +/- 4 to 7 km/h, flight altitude: 1200 m (data acquisition resolution: 50 cm on the ground). After an overflight, the data collected made it possible to calculate a loss index for each building located in the municipality of Namur. In order to calibrate the data, 120 citizens volunteered to test their building as a ‘witness’. On the nights of the flights, they took various temperature measurements inside and outside their homes and filled in a form concerning the characteristics of their homes. Roofs are then classified into 256 levels according to their average emissions. Therefore, these are not actual temperature values.