Data used for building function recognitiion in the GBA

The data follow a three-level hierarchical classification system consisting of primary, secondary, and tertiary categories. Primary categories represent major types of urban activities, including catering, shopping, daily life services, government and social organizations, science, education and culture, medical and health services, transportation facilities, financial and insurance services, and companies and enterprises.

Secondary and tertiary categories provide more detailed descriptions of individual facilities and services. This hierarchical structure preserves fine-grained functional semantics and supports the identification of complex and mixed building functions.The building footprint data consist of polygon features delineating individual building outlines. They provide basic information on building location, shape, and spatial extent.Together, these datasets support building function recognition by combining fine-scale visual characteristics, urban accessibility and spatial structure, POI-derived functional semantics, and building-level geometric information.