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The automatic creation of 3D models of urban spaces has become a very active field of research. This has been inspired by recent applications in the location-awareness on the Internet, as demonstrated in maps.live.com and similar websites. The level of automation in creating 3D city models has increased considerably, and has benefited from an increase in the redundancy of the source imagery, namely digital aerial photography. In this paper we argue that the next big step forward is to replacedoi:10.1145/1341012.1341015 dblp:conf/gis/LeberlBGK07 fatcat:7jqvdumgbja6hkn7mooamredja