D12

Research Abstracts on Spatial Information ScienceCSIS DAYS 2016

Map Collaging: A Framework of Location-based Services
with Heterogeneous Local Maps on Smartphones for Spatial Storytelling
Ruochen Si, Masatoshi Arikawa, Ryosuke Shibasaki
Center for Spatial Information Sciences, The University of Tokyo
Email: <si@csis.u-tokyo.ac.jp>(1) Motivation: Nowadays, web and mobile mapping
are widely used. They have powerful
location-based services (LBS), but are not detailed
or thematic in local areas like parks. Besides,
dominant mapping services, like Google Maps,
unify mapping styles and prevent maps’ diversity.
On the other hand, local areas have various
analogue maps, like illustrated maps and map
signboards, which contain detailed spatial
information and thematic local stories such as
culture, nature and history. Local analogue maps
are well designed for the particular area, but are
relatively difficult to read without LBS. This
research proposes a framework of map collaging
that combines local analogue maps and mobile
mapping to enable LBS on the images of local
analogue maps on smartphones to tell local stories
during navigation.
(2) Approach: Map collaging is made up from threehierarchies: raw data, geocoded maps, and courses(Figure 1). Raw data is the data without explicit
spatial information, like analogue map images.
Geocoded analogue maps are the raw map images(noted as the target maps) that are geocoded withgeoreferences to build connections to the mobilemapping (noted as the base maps). A course is acombination of series of geocoded analogue maps
to enlarge map collaging services areas and toenrich information. The map on the top layer in acourse is noted as the main map in the course andother maps are the background maps.
(3) Originality: Map collaging provides aninnovative platform for local storytelling andknowledge sharing with local analogue maps. It
incents cooperation among local governments,
communities and individuals in sharing local

knowledge, and broadens the access of local
knowledge on analogue maps with mobile
mapping services. It is supposed to be applied toprotect local knowledge, spread local culture andpromote local tourism.
(4) Characteristics:
・ Polylines are used as georeferences to build
mapping relations between analogue maps andthe mobile mapping, which ensures accurate
positioning along georeferenced polylines (Siand Arikawa, 2016).
・ Maps are overlaid based on focus-point
without geometric corrections. Typical focus
points include the user’s position and POI’s.
・ Spatial triggers are used to organize
storytelling among different local analogue
maps. Polyline and polygon triggers are set on
the base maps and are used to switch main
map when a user crosses the boundary of thetrigger; POI’s icons are used as point triggers
to automatically narrate the POI’s informationas the user gets close to the POI.
(5) Results: Cooperated with Kashiwa History Cluband Shiroi City Office, iOS applications
KashiwaWalk (Figure 2) and 白 井 散 策 Map
were developed and are available on App Store.
(6) Acknowledgement: We will thank to Kashiwa
History Club and Shiroi City Office for providing
valuable maps and photos, and helping to test theapplication and make the content.
(7) References:
Ruochen Si and Masatoshi Arikawa (2016)
Portable Map Signboard Collages on Smartphones
Using Polyline Georeferences. The Cartographic
Journal, 53 (1): 55-65.

Courses

Raw dataGeocoded analogue maps

Figure 1: Framework of Map Collaging

Figure 2: Main interface of KashiwaWalk- 55 -