Abstract: The basic principle of projective locus method to calculate local approximate epipolar image of linear array satellite stereo is discussed.A Line segment fitting approach is proposed to improve the precision of epipolar image.A new object space longitude and latitude based approximate epipolar image re-sampling approach is put forward.The proposed approach has well potential in dense image matching for generating high precision digital elevation models.Both searching range and mismatch possibility can be decreased.The experimental results show that the projective locus method is qualified for calculating local epipolar lines.The precision of line segment fitting is superior to that of traditional line fitting method.There is no y-parallax on re-sampled epipolar image with the proposed approach,which is advantageous for dense image matching.The precision of reverse calculation from epipolar image coordinates to original image coordinates is better than 0.04 pixel,which verifies the correctness of the proposed re-sampling approach.