“OpenStreetMap is a free editable map of the world made by people like you!”

AGI NORTH 23 April 2009

About Tim

Tim WatersFreelance GIS Consultantand Web Developer

Long time OpenStreetMap contributor & evangelist

Leeds UK

blog: http://thinkwhere.wordpress.com

tim@geothings.net

latest: http:www.MapWarper.net

VGI

Volunteered Geographic Information (VGI) is the harnessing of tools to create, assemble, and disseminate geographic data provided voluntarily by individuals (Goodchild, 2007).

Some examples of this phenomenon are Wikimapia, OpenStreetMap, and Google MyMaps.

These sites provide general base map information and allow users to create their own content by marking locations where various events occurred or certain features exist, but aren’t already shown on the base map.

VGI is a special case of the larger Web phenomenon known as user-generated content.

Straight outa Wikipedia.............there's more pictures later.

VGI

1. Potential of VGI to expand/complete/improve existing databases, infrastructures, & archives;

2. Potential of VGI to enable us to gather/produce new forms of spatial information that use local knowledge to inform previously un-answerable questions, unknowable phenomenon, and new social and political practices. (“new knowledge practices”)

Power of Volunteered Geographic Information

Concerns:

what drives people to do this, how accurate are the results, will they threaten individual privacy, and how can they augment more conventional sources

Basics:Web2 – web search, Google, communitiestechnologies, GPS cameras, network, computersCrowd sourcing

price, closed of NMAs (OS licences) Push factor

OpennessEasyAmateur---

Future with NMAs etc. Decline in world mapping. Remote sensing and VGI filling in the gap.Mapping economically determined. None in developing world. Expensive to keep up to date.

AND Map2.0

WIKIMAPIA

Go

og

le Earth

!

http://Geocodr.netA geocoder that uses k-means clustering of geotagged images

Flickr Shapefiles

ARGH!!!! Just show me some nice maps

Maps!

You can get the data. downloads.cloudmade.com

Berlin

Copenhagen

Amsterdam

Madrid

NYC

Baghdad

Sydney

Pretoria

Kinshasa

Map what you like

Germany 2006Germany 2006

Germany 2007Germany 2007

Germany 2008Germany 2008

Most other maps are non-freeVector data for custom maps is difficult to obtain

licencesUsers can improve the mapFast updatesCommercial maps have intentional errorsMany areas of the world are mapped poorlySpeciality mapsInnovative uses

OSM in a nutshell

Mapping data is not free

Not free as in freedom

Maps CopyrightMaps Copyright

The maps are based upon Ordnance Survey material with the permission of Ordnance Survey on behalf of the Controller of Her Majesty's Stationery Office © Crown copyright. Unauthorised reproduction infringes Crown copyright and may lead to prosecution or civil proceedings. Luton Borough Council. 100023935, 2006

The Ordnance Survey map data included within this web site is provided by Luton Borough Council under licence from the Ordnance Survey in order to fulfil its public function to act as a local authority. Persons viewing this mapping should contact Ordnance Survey copyright for advice where they wish to licence Ordnance Survey map data for their own use

Full of mistakes, car centred

Mistakes cannot be corrected

Cannot re use or reprint

Coverage economically determined

Change happens

inflexible

Katrina

100,000 users100,000 users330 million nodes330 million nodes800million trackpoints800million trackpoints1 Billion Tags1 Billion Tags

Donate data & free data

Tiger / Line

Other Sources:DonationsGaza, people donated to buyimagery for OSM

Yahoo allow use of imagery

Landsat

http://www.MapWarper.net

Or, just D.I.Y!Mapping party

Mapping Parties Galore!

Mapping Party Field Trip7 June SundayPatley Bridge

Mikels Case Study - Brighton

How to do it?Editors, online.

Do it from home!

Case Study:

Mikel in Brighton

Mapping Party, September 2006

OSM Brighton, December 2006

Summer 2007

TodayWinter 2007

Today

1.0

His Process

Download existing data to GPS

Print Out Map for Notes, Bicycle

Network Diagram

Upload GPS Tracks to Computer

Upload Tracks

Draw Over Them

Editing in Potlatch, rollbacks, history

Tech

The OSM-”Tool Chain”

API(Rails)

Potlatch(Flash)

JOSM(Java)

Database

...

Renderer

Mapnik

tiles@home

osmarender,pdfatlas,

...

planetdump

MySQL

Viewer

SlippyMap

(OpenLayers)

“Google”tiles

“Google”tiles

Editors

http://api.openstreetmap.org/api/0.4/way/35

<way id='7972254' timestamp='2007-09-24T12:36:29+01:00' user='chippy' visible='true'> <nd ref='59608510' /> <nd ref='59608509' /> <nd ref='59608516' /> <nd ref='59608515' /> <nd ref='59608514' /> <nd ref='59608513' /> <nd ref='59608512' /> <nd ref='59608511' /> <nd ref='59608510' /> <tag k='created_by' v='JOSM' /> <tag k='building' v='retail' /> <tag k='name' v='White Rose Shopping Centre' /> <tag k='amenity' v='shopping_centre' /> <tag k='note' v='huge building' /> </way>

RESTful API

Trackpoints

Nodes

Ways

highway = residentialname = Chestnut Laneoneway = truesurface = flags

highway = primaryname = Otley Roadref = A660

Tags!

http://wiki.openstreetmap.org/index.php/Map_features

amenity = hospitalname = Saint Jamesemergency = yesPOIs

Areas

leisure=nature_reserve

simple data format

tagging for metadata

standard map tiles

Volunteers.

OSM donation driveOver $22,500 raised in 3 days for new server in early February

Goal was $15,000servers

api 0.6downtime

API 0.6

Changesets

user id

version numbersDiffs can be applied

Licence

Now:Creative Commons by Share Alike

Future:Open Database Licence

CC = everything is shared alikeOdbL = only the database should be shared

Both allows commerical use

healthy ecosystem

toolsrendererseditorsroutersapplications

Potlatch

JOSM

Merkaartor

Mapnik

ORS

Many mobile apps

Freemap Slovakia & contours

Cycle Map

OpenPisteMap

Open Street Bugs

healthy ecosystem

toolsrendererseditorsroutersapplications

Ecology

System

Iteration

Gets better & stronger

Folksonomy

But with standardised conventions.

Votingmapping realityproposedadoption

iteration

landuse=vineyard vslanduse=farmcrop=grapes

Edit Wars

Taking a leaf.Tapping the crowd.

Map Maker from Google.

AND Map2.0

Peoples Map (dot dot dot)

QualityIs it any good?

OSM is sometimes the ONLY source for mapping dataMap ActionDeveloping World

How good it the data? − Positional accuracy− Completeness− Attribute accuracy and completeness− Consistency − Semantic accuracy− Temporal quality (up-to-date-ness)

http://tools.geofabrik.de/mc/Map Compare

Dair Grant

Errors in Google / Teleatlas

Errors in OSMbut, they can be fixed :)

OSM 193 bugs per 10km2

Google 89 bugs per 10km2

http://blog.fortiusone.com/2008/12/12/openstreetmap-vs-googleteleatlas-street-coverage/OpenStreetMap vs. Google/TeleAtlas Street Coverage

The size of the circles are proportional to the values for both, so small circles equal poor coverage and large circles equal good coverage. The overlap of the circles shows who appears to be doing better (orangey/brown showing means that osm is doing better, blue google). OSM is the top layer so a tie will have OSM looking better, but you can click the layers on and off to see both views of the coverage.

The data is very interesting. Quickly comparing the roads layers against OSM in Kenya show

good correspondence where there is Yahoo aerial imagery to trace against — if OSM had access to the same imagery,

I imagine we’d be pretty much equivalent country-wide. MapMaker is slightly more complete in central Nairobi; I put that down to Google

having full time employees in Nairobi who work on MapMaker

Green = OSMPurple = Mapmaker

http://povesham.wordpress.com/2008/08/07/osm-quality-evaluation/ UCL Muki Haklay http://www.ucl.ac.uk/~ucfamha/OSM%20data%20analysis%20070808_web.pdf

OSM VS OSCoverageBlue = OSM better

Meridian 2 and OSM – Motorway comparison

http://povesham.wordpress.com/2008/08/07/osm-quality-evaluation/ UCL Muki Haklay http://www.ucl.ac.uk/~ucfamha/OSM%20data%20analysis%20070808_web.pdf

Positional accuracy

On each tile, 100 points sample with evaluation of distance between OSM and Meridian 2

Can see significant differences: from about 3m to over 8m

Area Average difference (m)

Barnet 6.77

Highgate 8.33

New Cross 6.04

South Norwood 3.17

Sutton 4.83

Total 5.83

http://povesham.wordpress.com/2008/08/07/osm-quality-evaluation/ UCL Muki Haklay http://www.ucl.ac.uk/~ucfamha/OSM%20data%20analysis%20070808_web.pdf

The analysis shows that, where OSM was collected by several users and benefited from some quality assurance, the quality of the data is comparable and can be fit for many applications.

The positional accuracy is about 6 metres, which is expected for the data collection methods that are used in OSM. The comparison of motorways shows about 80% overlap between OSM and OS .

The challenges are the many areas that are not covered – currently, OSM has good coverage for only 25% of the land area of England

12 Months ago...http://povesham.wordpress.com/2008/08/07/osm-quality-evaluation/ UCL Muki Haklay http://www.ucl.ac.uk/~ucfamha/OSM%20data%20analysis%20070808_web.pdf

Thanks!

Tim Waters http://thinkwhere.wordpress.com

tim@geothings.netPub?

Field Trip!7 June SundayPatley Bridge