Patent ID: 7327897

Claim:
A method of precisely correcting geometrically distorted satellite images, using a satellite image and position and attitude values of a satellite at the time of photographing the satellite image received from the satellite, comprising the steps of: a) establishing a geometric relationship between the satellite image and a ground control point as non-linear equations comprised of position variables and attitude variables of the satellite, and respectively modeling the position variables and the attitude variables to equations of time; b) initializing the attitude variables of the satellite to the initial attitude values provided by the satellite; c) applying the initial attitude values of the satellite and position variable equations of the satellite, obtained by the modeling, to the non-linear equations to obtain position values of the satellite; d) applying the obtained position values of the satellite and attitude variable equations of the satellite, obtained by the modeling, to the non-linear equations to obtain attitude values of the satellite; and e) precisely correcting geometric distortion of the satellite image using the position values and the attitude values of the satellite obtained at steps c) and d), if a difference value between coordinates of the satellite image, calculated using the obtained position and attitude values of the satellite, and actual coordinates of the satellite image is less than a threshold value; and f) repeatedly performing the steps c) and d) using the obtained attitude values of the satellite if the difference value therebetween is equal to or greater than the threshold value.