Based on the theory of the relief effects on passive microwave radiation

we think that it is necessary to do the experiments in the field by observing the different topographic landscapes we design and compare the data we observe with the simulations of relief effects modeled by AIEM.The result shows there are 10-15 K bias of brightness temperatures affected by the tilted angles between flat terrain and mountainous terrain.When the frequencies are less than 10 GHZ

the relief effects of terrain elevation becomes weakening.Therefore

we certified that microwave polarization paths and directions have obviously changed due to the surface geometrical property

such as shape and the orientation of hills.