We have proposed a method of stereovision applied to urban areas, which consists in using surface models in stereovision . Using surface models is possible, not only to correct disparity errors and thus get a more accurate stereorestitution, but also to reconstruct a complete scene. In this paper we describe experimental tests of the method comparing the corrected and fit stereo output of our method with an accurate DEM obtained by an analytical plotter. We show that an average of 0.2 pixel precision of disparity can be achieved on a real complex scene by our method. Potential error sources are also discussed.