image position deviation between a nadir scanner observation image 520 and the backward scanner observation image 530 is 1 2 in the pixel unit an image based position and attitude correction apparatus 400 of the present invention can precisely correct the position and attitude information of the camera by analyzing the image position deviation fig3 is a block diagram illustrating the image based position and attitude correction apparatus 400 in accordance with an embodiment of the present invention if the observation apparatus employing the camera 100 equipped with the three line scanner progresses forward the forward scanner observation image 510 the nadir scanner observation image 520 and the backward scanner observation image 530 are generated in order by the three line camera the generated observation images 510 520 and 530 are inputted to the image based position and attitude correction apparatus 400 the forward scanner observation image 510 is stored in a first buffer memory 410 subsequently an image matching block 430 performs an image matching on the temporarily stored forward scanner observation image 510 and the nadir scanner observation image 520 which is inputted by real time observation through the nadir scanner 120 thereby calculating image position deviations u03b4u 1 and u03b4v 1 between two images 510 and 520 in the pixel unit the image matching can be performed in well known diverse methods including an area based matching method and a feature.