Image terrain radiation correction method and device

The present invention provides an image terrain radiation correction method and a device. The method comprises the following steps: reading a solar zenith angle and a solar azimuth angle of an image to be corrected; calculating and obtaining slope, aspect and a reference shadowing factor by using a digital elevation model; calculating and obtaining a sky observation factor according to the slope,and calculating and obtaining a solar effective incidence angle according to the solar zenith angle, the slope, the aspect and the solar azimuth angle; extracting a shadow zone of the image to be corrected, correcting the shadow zone by using the reference shadowing factor, and determining a shadowing factor; calculating and obtaining an atmospheric correlated radiation amount by using a radiationtransmission model; and according to the solar zenith angle, the sky observation factor, the solar effective incidence angle, the shadowing factor and the atmospheric correlated radiation amount, calculating and obtaining ref