The comments are also fun 🙂
Some older news but maybe useful for some people:
The IR-map is a joint project of 21 towns and villages of the region of Antwerp, with the support of the Flemish community. This map gives an indication of the heat loss from the rooftops at the time the shooting occurred. (four cold nights, at the beginning of March 2009) and is no absolute scientific instrument.
Only available in Belgium, region of Antwerp.
[ source ]