A Localized Landmark model based on OSM
data for Socialized Landmark based
Navigation System
Dhanajaya Thathsara, Pasindu Chandrasekara, Thejaka Mahaulpatha, Irendra
Janithra, Nimalika Fernando
Sri Lanka Institute of Information Technology, Sri Lanka
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Motivation
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Motivation
Regular societal practice Vs guidance given by navigation aids
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Anything missing?
• Navigation tool :
“Turn slightly to left to 7.1 km to
Anuradhapura –trincomalee road”
• In –person:
“turn to left near Anuradhapura
Junction, it’s a four way junction , there
‘s a big Na-tree towards left side ,
there’s a small tea shop too, you will not
miss it “
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Landmarks for path planning for local context
Sri Lanka – strong
cultural and social
significance for
landmarks
Source:
http://www.sundaytimes.lk/130120/news/peoplepower-saves-dambadeniya-era-geta-kumbuk-from-theelectric-saw-29536.html
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Source: http://www.greatmirror.com/index.cfm?navid=982
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How to model landmarks ?
• Significance of landmarks
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Prominence
Familiarity/Social background
Age
Day /night/ seasonal visibility
….
• Point Location + attributes
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Attributes
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Height
Spread
Day/Night visibility
Social significance
Cultural significance
Age group
Seasonal factors
…..
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Height
Tall
Medium
Short
Khan clock tower, Colombo, Sri Lanka
Image Source:
http://www.panoramio.com/photo/52483667
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Spread
Yes
No
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Day/Night Visibility
Day
Night
Both
Source :
http://www.mygola.com/akkaraipattud1122069/temple
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Cultural Significance
Place of worship: Buddhism
Place of worship: Muslim
Place of worship: Hindu
Place of worship: Christian
Statue: Buddhism
Tree : Religious
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Social Significance
 Amenity: Restaurant
 Amenity: place of
hangout
 Amenity: Shopping
complex
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http://imagessrilanka.blogspot.kr/search/label/Bananaleaf%20shaped%20bus%20halt%20shelter
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Represent landmarks in GIS
• Follow the OSM tag system
• Use existing tags where possible
• Introduce new tags to represent local
landmarks
Amenity: place of worship
Building: yes
Building: home
Amenity: atm
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<node id="64638681" version="4" timestamp="2013-0805T17:20:27Z" uid="1294392" user="lkmapper"
changeset="17230788" lat="6.0494692" lon="80.2151194">
<tag k="amenity" v="school"/>
<tag k="name" v="Mahinda College"/>
<tag k="opening_hours" v="Mo-Fr 07:30-13:30"/>
<tag k="url" v="http://www.mahindacollege.lk"/>
</node>
<node id="64638681" version=“1" timestamp="2013-0411T07:20:30Z" uid="1294" user=“Pasindu"
changeset="17230790" lat="6.1432876" lon="80.5678980">
<tag k=“place of worship" v=“buddhism"/>
<tag k=“statue" v=“yes"/>
</node>
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How to collect landmarks?
• Landmarks are social concepts
• Better let community collect them
• Social application
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Social application for landmark collection
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User registration
Add friends/ groups
Add, edit landmarks
Search people based
on proximity
• Path planning based
on landmarks
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Our final Solution
• Localized Landmark
Store Landmarks
Model
Use landmarks to • Landmark based path
aid navigation
planning
Clutter Free Map
Landmark based
Mobile Navigation
Application
Cross -platform
• Linear Map
Collect Landmarks • VGI & Geo-Socializing
FOSS based
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Acknowledgement & Credits
• The participation at FOSS4G is supported by a
travel grant.
• This is a study initiated by Geo-informatics
research group & OSGeoLab of SLIIT and now
being supported by a SLIIT Research Grant.
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Thank You !
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