Based on the experiment of Indoor simulation in the laboratory

this paper applied the thenmal radiationdirectionality model to verify its effectiveness on pixel scale. When the corresponding ground surface is primarilycomposed of three dimensional structure and is of heterogeneous temperature in a pixel

the observing data and analysisshow that the directionality of radiant temperature of one pixel is due to the geometrical construction and thetemperature difference between the sub-components in the pixel. In the indoor simulation experiment of threedimensional heterogeneous surface

it proved that the thermal radiation directionality model worked well in temperatureinve川ng on pixel scale.