The GER EPS series scanners are capable of operation in the thermal region (8-12 micron) of the spectrum. Radiation in this region is dominated by emitted radiation rather than reflected sunlight and is hence a measure of the temperature of the scene. The ability to produce a gray-scale or color image of a scene where the gray-scale or color represents differences in temperature has many uses. GER thermal surveys have been used to: observe and quantify heat loss from residential and public buildings; find buried ordnance; detect the presence of vehicles under camouflage or the recent presence of vehicles and aircraft; detect the hot spots in grass or forest fires through the obscuring smoke ; detect upwelling warm spring water in cold lakes; observe the discharge and temporal evolution of coolant water plumes from power stations ; infer the presence of cracks or breaks in underground aquaducts or pipes by detecting the upwelling warm water against the cooler ground; alert the farmer to an irrigation problem; alert the citrus grower to a disease problem in his orange groves (orange trees run a temperature when under threat from pests and diseases) and many more.