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Indoor navigation has to deal with more issues as compared to outdoor navigation. Those issues include but are not limited to; needmore level of detail to process enclosing area around navigating subject or object, consideration of the context of navigation (aboutlocomotion type and its operating environment), and dealing with unconstrained indoor space for accurate results. Because of thesecomplex issues, most of the frameworks for indoor navigation support for only one single type of locomotion, i.e. either walking,driving, or flying. And this decision to select a specific type of locomotion results in restricting the use of representation of indoorspace for other types of locomotion e.g. graph-based abstraction of indoor space for driving cannot be used for flying.  In this work, we addressed the problem of supporting different types of locomotion in indoor space by determining 3D navigablesubspace for the given locomotion type based on its physical constraints. While determining 3D subspace, we focused on someissues that include indoor space representation, precision of subspace computation, and "the consideration of the context ofnavigation" (about indoor space and the locomotion type). To achieve better representation of indoor space, the subspaces aredetermined based on the connected opening spaces. And for precise subspace computation according to the given locomotion type,we used the geometric methods i.e. configuration space from robotics field. Furthermore, a semantically enriched 3D indoor virtualmodel in CityGML format and different locomotion types (flying, driving, and walking) containing information (semantics,geometry, and topology) were considered to examine the context of navigation. Last but not least, the subspacing procedure waspresented and implemented in a sound mathematical framework i.e. Multilayered Space-Event Model (MLSEM) as proposed byBecker, Nagel, and Kolbe in 2008 and 2009

isprs annals of the photogrammetry, remote sensing and spatial information sciences

SUBSPACING BASED ON CONNECTED OPENING SPACES AND FOR DIFFERENT LOCOMOTION TYPES USING GEOMETRIC AND GRAPH BASED REPRESENTATION IN MULTILAYERED SPACE-EVENT MODEL (MLSEM)