11. Matemaattis-luonnontieteellinen tiedekunta
TIME IN ACCESSIBILITY
MODELLING?
Weiss et al. (2018). Nature.
Location-based models
Detailed,
data intensive,
time has been
incorporated already
for long (Hägerstand 1970;
Miller 1991; Kwan 1998)
Farber et al. (2013). Ann. of AAG.
Person-based models
Operational,
broad-to regional scale,
often static analysis
13. Matemaattis-luonnontieteellinen tiedekunta
MAIN AIM HERE
Discuss about a generic framework for
dynamic, location-based accessibility
modelling
Examine the importance of temporality of
different components of accessibility
using Tallinn and Helsinki as case study
areas
19. Matemaattis-luonnontieteellinen tiedekunta
A COMPARISON BETWEEN
STATIC AND DYNAMIC
ACCESSIBILITY
People: Call Detail Records (CDR)
Transport: GTFS schedule data
Activity locations: Grocery store data (web)
People Transport
Activity
locations
Model 1 Static Static Static
Model 2 Dynamic Static Static
Model 3 Static Dynamic Static
Model 4 Static Static Dynamic
Model 5 Dynamic Dynamic Dynamic
21. Matemaattis-luonnontieteellinen tiedekunta
HOW MUCH DOES
TEMPORALITY MATTER?
What is the share of population that
reaches their closest grocery store
within given travel time, at different
times of the day?
22. A Fully atemporal model
Share of population reaching the closest grocery store
23. A Fully atemporal model
B Only people dynamic
Share of population reaching the closest grocery store
24. A Fully atemporal model
B Only people dynamic
C Only transport network dynamic
Share of population reaching the closest grocery store
25. A Fully atemporal model
B Only people dynamic
C Only transport network dynamic
D Only services dynamic
Share of population reaching the closest grocery store
26. A Fully atemporal model
B Only people dynamic
C Only transport network dynamic
D Only services dynamic
E All components dynamic
Share of population reaching the closest grocery store FROM ~10
UP TO 70 %
DIFFERENCE!!
42. DIGITAL GEOGRAPHY LAB
Tuuli
Toivonen
Enrico
Di Minin
Anna
Hausmann
Henrikki
Tenkanen
Olle
Järv
Vuokko
Heikinheimo
Tuomo
Hiippala
Supporting sustainable spatial planning
using digital data and novel methods
http://www.helsinki.fi/digital-geography
Maria
Salonen
Gonzalo
Cortés Capano
Joel
Jalkanen
Johanna
Eklund
Christoph
Fink
Elias
Willberg
Kerli
Müürisepp
Claudia
Bergroth
43. THANK YOU!
Follow us on:
http://www.helsinki.fi/digital-geography
Twitter:
@digigeolab
@TuuliToivonen