Triangular-Prism Model Method for 3-D Space Description and Visibility Analysis

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This paper proposes Triangular-Prism Model Method (TPMM) for 3-D space description. TPM, considered as an extension of TIN model, consists of triangular prisms and each top triangle is surface of the ground, buildings, and other objects on the ground. Vertical walls also can be expressed with side face of prisms.<BR>TPMM simplifies visibility analysis between elements of surface model. Visibility among a group of triangular prisms can be related with visibility of a group of 2-D triangles that are projection of the prisms onto 2-D space. This paper introduces visibility sorting, where triangular prisms are sorted according to visibility from a viewpoint.<BR>The visibility sorting has been applied to true orthoimage processing where occlusions by buildings are essential. Tests with 30 aerial images of Shinjuku area resulted that occluded area around building was extracted in each true orthoimage. True orthoimages can be synthesized into one composite true orthoimage where occluded areas of one image are compensated with other true orthoimages.
社団法人日本写真測量学会の論文