Geopositioning of SPOT-5 Stereo Images Based on Line-of-Sight Calibration

The rigorous geometric model of SPOT-5 images is introduced firstly,and a new geopositioning method based on line-of-sight rectification is proposed.Then,we deduce the bundle adjustment of line-of-sight calibration.Test results using SPOT-5 images show that using a little GCPs the systematic error can be reduced effectively after adjusting the look angles,and the object positioning accuracy can be impoved.Comparative experiment shows that line-of-sight rectification can provide similar position accuracy in case of 5 control points,with direct correcting of orbit and attitude error in case of 10 control points.