The thermal image was taken during the night of March 16, 2007, by BlueSky International Ltd. and was overlaid with a local map of the neighborhood to quickly identify which homes are energy efficient and which are not.
An interactive map is available here. Basically, the bluer the house, the more efficient it is. Those in the red are displaying higher power/energy waste.
“The sole aim of the project is to assist residents with properly insulating their properties,” the Haringey Council reports on its website.