To produce an orthophoto, georeferenced aerial images and a digital reference surface model are needed. Orthophoto projects aim to deliver a seamless orthophoto mosaic produced from single rectified images. It has a defined scale and can be used similarly as a planimetric map. The case study and the final project are outlined below.įigure 1: Depiction of buildings in a traditional orthophoto (left) and a true orthophoto (right).ĭifferences between traditional and true orthophotosĪn orthophoto is a photo or an image that is corrected for projection distortions. Based on the findings, the team decided to use a true orthophoto based on an automatically generated digital surface model.
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The resulting orthophotos were then compared against a traditional orthophoto in terms of aesthetic appearance and the manual work needed. One approach used a combination of a digital terrain model and a vector digital building model, and another approach used an automatically generated digital surface model. The authors set out to explore whether that really is the case based on a study of the production of a true orthophoto of the Municipality of Ljubljana, Slovenia.īefore producing a true orthophoto for the entire municipality of Ljubljana, Slovenia, the authors first tested various approaches in a smaller area in order to find the most economical workflow. However, there is still a widespread belief that the production of a true orthophoto is expensive and demanding. In orthophoto projects of dense urban areas, true orthophotos are preferred over traditional orthophotos because they put building roofs into the correct horizontal position.
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