Byounghyun Yoo and Soonhung Han, Korea-China Joint Conference on Geometric and Visual Computing, Busan, Korea, pp.161-170, August 24-26, 2005.
Abstract: This paper describes a representation for the real-time mapping displacement of buildings onto the polygon model of base terrain ingeo-spatial information. Geo-spatial information used for modelingthe virtual environment of flight simulation is similar to thedisplacement map. The buildings are represented as height maps,leading to a technique with very low memory requirements and notinvolving any changes of the model's original geometry (i.e., novertices are created or displaced). In this approach, thedisplacement of buildings is mapped toward the protruding direction.As a result, the base of texture which represents the ground intopography is correctly mapped onto base polygon without anydistortion. Since the displacement of buildings is applied as theheight field, instead of depth field as in previous approaches, theprotruding shape of buildings can be correctly represented. Thisapproach can exhibit the correct occlusions between buildings andground due to parallax and correct self-occlusion. The approach canbe used to consistently add representations of buildings to originalgeometric models of underlying terrain.
Keywords: aerial photograph, digital map, displacement mapping, geo-visualization, image-based rendering