Namur — Full Colorful Thermography

Aerial thermography by infrared scanner is a technique for measuring and illustrating the “radiative flux” emitted by the overflyed roofs. Thanks to these radiative fluxes, it is possible, under certain conditions, to estimate the extent of thermal loss from roofs. Thermography therefore gives an indication of the insulation state of the roofs. An aircraft equipped with an infrared scanner flew over the commune during the nights from 16 to 17 and from 23 to 24 February 2018. For the data to be correct, several conditions had to be met (good visibility, clear sky, humidity of 80 %, temperatures between -5 °C and -3 °C, winds of ± 4-7 km/h, flight altitude: 1 200 m (data acquisition resolution: 50 cm on the floor). After an overflight, the data collected made it possible to calculate a loss index for each building located in Namur commune. In order to calibrate the data, 120 citizens volunteered to test their building as a “controller”. On the nights of the flights, they took different temperature measurements inside and outside their home and completed a form regarding the characteristics of the dwelling. Roofs are then classified into 256 levels according to their average emission. Therefore, these are not real temperature values.