期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2016
卷号：XL-3/W4
出版社：Copernicus Publications
摘要：Often the existing methods of texturing 3-D urban models use conventional vertical imagery and libraries of generic textures. These may be sufficient for some applications of 3-D models like training simulation, gaming, and telecommunication planning, but in engineering and cultural heritage documentation there is a need for photo-realistic modelling for maximum levels of detail and geometrical accuracy. P hotorealism and high levels of detail can be achieved through using terrestrial imagery but it is very time- consuming process particularly in large modelling projects. It is possible to improve efficiency by image capture from a moving ground based vehicle but this requires an extra process in the work flow if the initial modelling has been undertaken by aerial photogrammetric processes. Pictometry vertical and oblique images are an established technique for visual inspection of the landscape as they provide good viewing directions and high levels of detail of not just the roof tops but also many facades of the buildings. The more conventional method of collecting aerial images with for example UltraCamD, can also provide excellent views of roof tops and some of the building faces when located away from the nadir on the images. Combining the imagery provides an opportunity to maximise the capture of 3D urban models from aerial imagery. This paper will present the experiences from the research undertaken to date at the IESSG to explore the use of the Pictometry images and the UltraCamD images for 3D urban modelling. Nottingham is the study area for this research. The extraction of 3D geometry for buildings in the study area has been performed using both vertical Pictometry imagery and UltraCamD imagery. The high metric qualities of the polygons extracted from the UltraCamD images can be used as a bench mark (BM) to check the accuracy of polygons obtained from Pictometry. Planimetric and height comparisons of the extracted features from Pictometry system with the BM results have been performed. The results show that the Pictometry imagery produced good results especially in plan taking into consideration the differences in the GSD, and the two camera systems. The results of automatically texturing the models have shown that using the vertical blocks of UltraCamD or Pictometry produces very good roof textures but limited in producing high quality on the facades. The use of oblique Pictometry images in texturing can produce very good facades but in some instances not such good quality roof textures. The successful combining of vertical and oblique Pictometry images provides an excellent opportunity to produce an efficient method of high quality urban model texturing. The results do lead to investigations in to combining the aerial images with terrestrial images to further improve the quality of models particularly at the ground level. This is important as people normally view the urban environment from the pavement
关键词：Oblique; Extraction; 3D models; Pictometry; UltraCamD; Texturing
