Geoscience Reference
In-Depth Information
Fig. 13.11 The ratio of POI usage for friends vs. random pairs shows that friends are more likely
to use the same POIs if they live on the periphery of the city. These POIs are denoted in red ,where
up to 2.8 % of their usage is linked with friendship
POI. In other words, although the downtown core attracts more people, the majority
seem to be mutual strangers, while in the suburban area POIs serve as intentional
meeting points. We interpret this finding with care, as there are fewer POI points
on the periphery of the city, thus reducing the granularity and precision to capture
activity spaces found in the city's outskirts. For instance, an activity space in the
shape of a narrow line can be captured via the dense, granular points in downtown,
but such a detailed structure could not be defined in the periphery, since there are so
few cell towers and POIs to delineate a more precise activity space.
In summary, friends and even second-degree friends tend to use common points
of interest in the city. Additionally, high-degree users (i.e., those with many friends)
tend to be associated with downtown locations (central business district), but those
with many social triangle friendships center in a neighborhood east of the central
business district. The downtown core hosts many heterogeneous social groups
instead of small tightly knit social clusters.
13.5
Discussion
We leveraged social/spatial data from call data records in a new way that emphasizes
social relationships embedded in urban physical space. In this section, we respond to
our initial hypotheses regarding how dyads (pairs), social network personas, triads
(groups of three), and communities use the city.
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