Digital photogrammetric products are used in many engineering applications, and the orthorrectified aerial photographs are widely used due to the ease of handling compared to conventional maps. The Digital Terrain Model (DTM) is one of the most important inputs needed to generate the orthophotos, where the intensity and the level of detail of this DTM play an important role in determining the final accuracy of these orthophotos. DTM is usually prepared by digitization of contour lines or by using leveling points distributed within the imaged scene. With appearance of aerial laser scanning technique, it became possible to obtain a high-resolution and highly detailed DTM, but with high cost. In this paper, we illustrate the possibility of using new system in the production of DTM. This system simulates the laser scanners. These systems are image-based, low-cost, and guarantee an acceptable precision. We discuss also the effect of the density of DTMs on the visual and the geometric quality of the final orthophoto. Verification of accuracy will be achieved by the of check points that have been obtained from aerial triangulation process of the used aerial images.
Tishreen University Journal.
2017.
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