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The main objective of this research is automatic generation of more accurate DEM/ortho-image and, by extension, to update existing DEMs and ortho-images database automatically by using high resolution satellite images. In the first part, we tested the possibility of automatic GCP and tie-point generation for DEMs and ortho-images generation. We extract Ground Control Points (GCPs) automatically from high resolution satellite image by using existing ortho-images and existing DEMs. In second part, we tested whether high resolution images can be used to update existing DEMs and ortho-images. For this, we performed automatic generation of DEMs/ortho-images by using true GCPs obtained by GPS surveying. For testing the method proposed, we used IKONOS, SPOT 5, QuickBird, Kompsat-2 high resolution satellite images. Assessment for results supports that automatic generation of DEMs/ortho-images was performed successfully. We generated a DEM from IKONOS images fully automatically by using GCPs generated from existing DEMs and ortho-images. Newly updated DEM was compared with existing data. Updated DEM shows more detailed surface, and the result of validation shows that the accuracy is similar with that of existing DEMs/ortho-images.

Research for Automatic Generation and Update of DEM/Ortho-image from High Resolution Satellite Images