Thermography is a remote sensing technique, performed by acquiring images in the field of infrared radiation.
Infrared radiation is electromagnetic radiation with a frequency band of the electromagnetic spectrum lower than that of visible light, but greater than that of radio waves, having wavelength between 700 nm and 1000 nm.
Infrared radiation is often associated with the concepts of "heat" and "thermal radiation", because every object with temperature above absolute zero spontaneously emits radiation in this band.
Thermal surveys are preferably carried out at night because, this way, only the thermal radiation emitted by the investigated surfaces will be recorded, depending on their absolute temperature, without the influence of the energy flow coming from the sun.
A thermal survey is planned by overflying the survey area according to parallel strips, with a 60% longitudinal overlap between images and overlapping of 20
