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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

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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

Source: http://www.sundaytimes.lk/130120/news/people-power-saves-dambadeniya-era-geta-kumbuk-from-the-electric-saw-29536.html

Source: http://www.greatmirror.com/index.cfm?navid=982

Sri Lanka – strong cultural and social significance for landmarks

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How to model landmarks ?

• Significance of landmarks– Prominence – Familiarity/Social background– Age– Day /night/ seasonal visibility– ….

• Point Location + attributes

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Attributes • Height• Spread• Day/Night visibility• Social significance• Cultural significance• Age group• Seasonal factors • …..

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Height

TallMediumShort

Image Source: http://www.panoramio.com/photo/52483667

Khan clock tower, Colombo, Sri Lanka

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Spread

YesNo

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Day/Night Visibility

Source : http://www.mygola.com/akkaraipattu-d1122069/temple

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DayNightBoth

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Cultural Significance

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Place of worship: BuddhismPlace of worship: MuslimPlace of worship: HinduPlace of worship: ChristianStatue: BuddhismTree : Religious

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Social Significance

Amenity: Restaurant

Amenity: place of

hangout

Amenity: Shopping

complex http://imagessrilanka.blogspot.kr/search/label/Banana-leaf

%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

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Amenity: place of worship

Building: yes

Building: home

Amenity: atm

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<node id="64638681" version="4" timestamp="2013-08-05T17:20:27Z" 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="2013-04-11T07:20:30Z" 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

• User registration• Add friends/ groups• Add, edit landmarks• Search people based

on proximity• Path planning based

on landmarks17/09/2015

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Our final Solution

• Localized Landmark ModelStore Landmarks

• Landmark based path planning

Use landmarks to aid navigation

• Linear MapClutter Free Map

• VGI & Geo-SocializingCollect Landmarks

Landmark based Mobile Navigation

Application

Cross -platform

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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