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Regions and places in the city: gathering insights from primary and secondary data sources in light of GIScience
Publication . Tang, Vicente de Azevedo; Painho, Marco Octávio Trindade
This thesis investigates the integration of place-based concepts within Geographic Information
Science (GIScience) through mixed-methods approaches that leverage user-generated content
(UGC) and participatory mapping. The primary challenge addressed is the operationalization
of place-based knowledge within Geographic Information Systems (GIS), particularly in urban
environments where traditional data sources often fail to capture the nuanced dimensions
of places. Despite advancements in GIScience, significant gaps remain in methods that
integrate spatial and semantic aspects of places. Existing research often simplifies place-based
constructs, such as neighborhoods, neglecting important facets related to human experiences
and perceptions. To address these gaps, this thesis presents a series of studies focused on
specific research questions related to the operationalization of place within GIS. The research
harnesses the potential of both geographic UGC and participatory mapping approaches as
essential data sources and are grounded in case studies conducted in the city of Lisbon
(Portugal). By developing a framework based on transformer-based topic modeling and
spatial statistics, we were able to unravel the relationships between social media content
and place-based semantics, providing important insights into content-location relationships.
Then, we leveraged multiple UGC sources to extract and compare neighborhood boundaries,
highlighting the challenges and limitations of relying solely on UGC for retrieving spatial
projections of place-based concepts. Lastly, we employ participatory mapping to explore the
richness of residents’ perceptions of neighborhood boundaries as well as their relationships with
features of the urban form, particularly street networks. The findings of this thesis contribute
significantly to GIScience by providing innovative methodologies for analyzing and mapping
place-based concepts. The methods and implementations enhance the understanding of how
residents mentally structure their city both spatially and semantically, ultimately supporting
more informed urban planning and policy-making. In addition, the thesis critically evaluates
the strengths and limitations of both UGC and participatory mapping, underscoring the
potential for more accurate and context-sensitive GIS models that reflect the lived experiences
of residents.
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Fundação para a Ciência e a Tecnologia
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UI/BD/151247/2021