Improvement in the Accuracy of DEM for Orthophoto Generation by Reverse Projection Method

Abstract

Recently, generation of the orthophoto using digital aerial photograph is performed for the maintenance of spatial information data for wide areas by middle scale. For orthophoto generation, digital elevation model (DEM) by the stereo matching methods is widely used. For the efficiency of orthophoto generation, mismatching should be removed and accuracy should be improved effectively in stereo matching process.
With this motive, new method which is called “Reverse-Projection Method” to remove mismatching points on DEM generation is proposed. The most remarkable points of the method are its ability to detect mismatching points and improve accuracy of DEM using only neighbor stereo models on the strip or the next strip, and the effectiveness of the method is discussed in this paper.