“…Definitions of the five categories are as follows: - Room‐like space: This category includes all the indoor spaces that are similar to rooms, which connect to the corridor or other room‐like spaces through doors or openings, such as a room, lift, stair, escalator, etc.
- Corridor: Corridors are the passageways in indoor scenes, such as a hotel or office building, from which doors lead into rooms.
- Atrium: Atriums are defined as large open spaces within buildings (e.g., the open space in a shopping mall in Figure 3). They are often several stories high and have a glazed roof or large windows, and located immediately beyond the main entrance doors (in the lobby).
- Indoor POIs: An indoor POI is a location in indoor space where information regarding a particular place, service, facility, or event is available, in contrast to traditional POIs located in outdoor environments (Claridades & Lee, 2020). Indoor POIs are necessary to support various indoor applications and services, including route navigation, facility management, and evacuation simulation.
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