ICRC GIS officers - 24/08/2010Frédéric Bonifasfredericbonifas@gmail.com

OpenstreetmapGeneral

What is Openstreetmap ?

Openstreetmap ?

● Collaborative project to create a free and open map of the world

● Database of geographical vector data● Wiki-style editing

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Why does OSM exist ?

● Most other maps are non-free (eg : hard to get Google MapMaker for Kyrgyzstan)

● Vector data for custom maps is difficult to obtain

● Users can improve the map

● Fast updates

● Commercial maps have intentional errors to prevent copy

● Many areas of the world are mapped poorly

● Specialty maps

● Innovative uses

Innovative use ? OSM cake !

History

● Aug 2004 : Creation of OpenStreetMap● March 2006 : OSM on Garmin GPS● Dec 2006 : tracing over Yahoo aerial imagery

allowed● July 2007 : First international conference (State

of the Map)● 2008 : TIGER import in the US● July 2010 : OSM used by MapQuest and Bing

Technical side

Data primitivesNode : basic elementLatitude & longitudeUsed for POIs

Way : ordered interconnection of nodesUsed for linear features

Closed Way : first and last nodes of the way identicalUsed for areas

Relation : group of any primitives with associated rolesUsed for relationships between objects and abstract objects

Attributes

● Attributes for differentiation of each data primitive

● No restriction on tags assigned to elements : use any attributes you want !

● Frequently used attributes are documented → http://wiki.openstreetmap.org/wiki/Map_Features

Map Features

Which features ?

● Streets and roads● Boundaries● Landuse● Hydrography

● Buildings● Road signs● Amenities and shops● Pedestrian and bicycle informations● Public transport

Community

Who is participating ?

● Citizens and associations

● Private societies

● Google, Yahoo !● AND● Cloudmade, Geofabrik, Camptocamp

● Organizations

● Local governments● NGOs

Important growth

290000 contributors1,9 billion GPS points740 million nodes60 million polylines

Mapping parties

State of the Map

Governance

Needs● Represent the OSM community● Money and servers management● Legal aspect

Structures● OpenStreetMap Foundation● Local chapters● Humanitarian OpenStreetMap Team