St Martin-in-the-Fields church,Trafalgar Square,London,UK,thermogram. The colours show variations in temperature. The scale runs from white (warmest),through yellow,orange,red and purple to black (coldest). Thermography records the temperature of surfaces by detecting long- wavelength infrared radiation. Buildings reflect and produce a lot of heat,meaning that London is consistently warmer than its surrounding countryside. There has been a church at the site of St-Martin-in-the-Fields since at least the thirteenth century. Originally the church stood literally in the fields,between the cities of Westminster and London |