Water-leaving radiation spectrum calculation method and device, terminal and storage medium

The invention provides a water-leaving radiation spectrum calculation method and device, a terminal and a storage medium. The method comprises the following steps: calculating a skylight reflection angle corresponding to each pixel point in a water body hyperspectral image obliquely shot by a hyperspectral camera according to an inclination angle and a field angle of the hyperspectral camera; calculating the relative radiation quantity of sky light received by each pixel point in the water body hyperspectral image according to the sky reflection angle corresponding to each pixel point; calculating a sky light spectrum received by each pixel point in the water body hyperspectral image based on the relative radiation quantity of the spectrums received at the first preset position and the second preset position within the preset difference value range of the difference value of the water-leaving radiation spectrums and the sky light; and calculating the off-water radiation spectrum of each pixel point in the wat