The FLIR SC6000 High-Speed thermal camera has a spectral range of 1.5-5.0µm with a thermal range of -20 to 350°C and accuracy of ±2°C. It was used to produce thermal imagery by The Geoinformation Group which was later distributed by the Landmap project.
The thermal data is generally captured between 7pm to 11pm to avoid solar activity which would produce false readings and when most houses would be heated, in cold (less than 10°C) dry weather so that the temperature differential between indoors and outdoors is maximum.