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Fig. 13.4
Two single activity space ellipses in
dashed blue
and
solid pink
intersect underlying
Points of Interest (POIs). The POIs intersected by the dashed ellipse are
green circles
. Those
intersected by the
solid pink
ellipse are
orange squares
. POIs that do not intersect either ellipse
are
grey triangles
be able to understand what amenities and places for meeting each individual has
in his or her activity space. We overcome these drawbacks by creating a third
layer of relevant points, as suggested by geometric probability theory (Santaló
2004
).
Agents' activity spaces are qualified by the points of interest (POIs) they spatially
intersect (Fig.
13.4
). These POIs are where “optional” activities are likely to occur
(Gehl
1987
), including services, transport, and recreational areas as a proxy for how
agents use the city. POIs are landmarks for social interactions, as third places and the
activities performed in third places have been shown to be essential for relationships,
social health, and quality of life (Rosenbaum
2006
). Friends may visit POIs to dine
or to do business.
POIs are selected and digitized by the authors from
Google Maps
(2013) with
data provided by
AutoNavi,
which operates under an open-use license. Although
it is default to gauge how well this set of geographic information (VGI) reflects
actual POIs in the city, it is used as a proxy for all POIs in the city (Coleman
2010
; Neis and Zipf
2012
). The digitized set of POIs are retrieved as a keyhole
markup language (KML) file and analyzed in the Esri
ArcMap 10.1
environment.
POIs include the city's recreation spots (including parks, internet cafés, personal
wellness centers), commercial centers (restaurants and bars, stores, markets, and
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