Abstract
Localization services available on today's mobile devices are proprietary and leverage a limited set of sources of location information. Integration of new location estimation methods is therefore cumbersome, requiring adaptation to the specific interfaces of the proprietary location service. In addition, location-based applications are tightly interwoven with the location service that is typically provided by the operating system, hence these applications require significant restructuring to be able to run with another location service. To address these problems, we propose a modular localization service architecture that consists of location-based applications, an integrated location service enabling a fusion of so-called elementary location services, and resources for generating location information. A unified style of interaction among these components is enabled by a set of well-defined Application Programming Interfaces (APIs). The practicability and advantages of the proposed design is demonstrated by outlining how the APIs can be realized using modern types of component interactions.
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