introduction to osm
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Introduc)on to OpenStreetMap (OSM)
Mayra Zurbarán With support from GEOlab and
PoliMappers from Politecnico di Milano
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OpenStreetMap (OSM) – What is it? • The most popular project of Volunteered Geographic InformaAon (VGI) → Founded by Steve Coast in UK in 2004:
hNp://wiki.openstreetmap.org/wiki/History_of_OpenStreetMap
→ Free, editable vector map of the whole world built by volunteers: hNp://wiki.openstreetmap.org/wiki/About_OpenStreetMap
h9p://openstreetmap.org
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OpenStreetMap (OSM) – How many users?
• (Jan 2017) there are more than 3 million registered users: hNp://wiki.openstreetmap.org/wiki/Stats
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OpenStreetMap (OSM) – License • OpenStreetMap is an openly-‐licensed database!
→ OSM was born from the evidence that many geodata are proprietary or copyrighted, i.e. you cannot freely use them (e.g. Google Maps) hNp://wiki.openstreetmap.org/wiki/Why_OpenStreetMap%3F
→ OSM is licensed under the Open Database License (ODbL) by the OpenStreetMap FoundaAon (OSMF)
hNp://opendatacommons.org/licenses/odbl/summary
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OpenStreetMap (OSM) – How to contribute
• Everything you need to contribute to OSM is to create an account from: hNp://www.openstreetmap.org
• EdiAng OSM? → iD: a simple, easy-‐to-‐use online editor – suitable for beginners
hNp://wiki.openstreetmap.org/wiki/ID → JOSM: a more powerful, offline editor – suitable for experienced users
hNps://josm.openstreetmap.de → Vespucci: an Android editor – suitable for fast and efficient field survey
hNp://vespucci.io → Many others! – Full list at: hNp://wiki.openstreetmap.org/wiki/Editors
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OpenStreetMap (OSM) – The data model
• OSM objects are the combinaAon of geometries and tags.
• There are 3 geometries (hNp://wiki.openstreetmap.org/wiki/Elements) : → NODE: a single point
→ WAY: an ordered list of nodes – Includes polylines and polygons
→ RELATION: a logic group of nodes, polylines & polygons
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OpenStreetMap (OSM) – The data model
• OSM objects are the combinaAon of geometries and tags.
• Tags are the object aNributes, and are composed of a key and a value: → Example: a building (polygon) which is used as a hotel has the tag
→ An object must have at least one tag, but can have any number of tags → The reference set of OSM tags (a “must” for any OSM user) is available at
hNp://wiki.openstreetmap.org/wiki/Map_Features
building = hotel
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OpenStreetMap (OSM) – The data model
• Tags are the object aNributes, and are composed of a key and a value:
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OpenStreetMap (OSM) – The data model
• Tags are the object aNributes, and are composed of a key and a value -‐ RelaAons:
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OpenStreetMap (OSM) – It’s simple! 10-‐year old kids can do it!
Mapathon at POLIMI with 200+ school kids
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The HOT Tasking Manager • The tool designed for managing collaboraAve humanitarian mapping in HOT and Missing Maps projects (hNp://tasks.hotosm.org): → The areas to be mapped are subdivided into small sub-‐areas, that can
be completed rapidly – users map independently from each other and in different areas, to avoid conflicts!
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Task – #2631 • Missing Maps: Zambia Malaria EliminaAon 46
→ hNp://tasks.hotosm.org/project/2631
Help create an UNINORTE #hashtag!
• Aper Mapping: QuanAfying the mapping done using this great tool from Pascal Neis: hNp://resultmaps.neis-‐one.org/osm-‐changesets
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State of the map – Ramani Huria
Mapping for flood resilience in Tanzania: hNp://ramanihuria.org/ Atlas available at: hNps://issuu.com/ramanihuria/docs/ramani_huria_atlas_final
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Gracias! – let’s map!
OSM user: mazucci TwiNer user: @mazucci