Both the statistical method and the fractal theory were used to numerically
construct the simulated images of natural terrains. The IR feature model o
f natural tereains was established by using the principle of heat transfer,
and a simple algorithm was proposed to calculate the IR irradiance of comp
lex terrains. The IR images of natural terrains were simulated by embodying
the numerical results of infrared radiation in the generated geometrical p
ictures of natural terrains.