Optical satellite remote sensing imagery is acquired by receiving the reflection of the sun incidence rays

the earth surface radiation and atmospheric dispersion by sensor.If the satellite’s observation from side-viewing

the relative position between sun and the satellite changes with date

geography position and local time

however

if all the conditions are proper

the sun and the satellite could be symmetrical which is similar to the specular reflection observed on the ground.In this case

the brightness of acquired image is much higher than normal situation

and the reflection energy acquired by the satellite is too high because of the non-uniform reflection of earth’s surface.Sometimes the image is too supersaturated to use.This paper studies the influence on the quality of remote sensing image

which is caused by the satellite observation direction and sun illumination direction.After analyzing the influence with SPOT imagery data

it is found that the satellite and sun are probably in the specular reflection position

when satellite observes the area between north latitude 32°and 45° with large inclination angle to left side off the track during the date from May to September.This situation will have negative influence on satellite remote sensing imagery.