Two's a Crowd: Crowdsourcing Addresses for OpenStreetMap in the UK
1. Two's a Crowd:Two's a Crowd:
OpenStreetMap Experience of
Crowdsourcing Addresses in the UK
Jerry CloughJerry Clough
SK53
SK53.osm@gmail.com
@SK53onOSM
Blog: Maps Matter
3. SurveysSurveys
â
Primary means of address collection
â Bicycle or Foot
â 250-1000 addresses per hour (inner
city-suburbs)
â Usually pencil & paper, perhaps with
Field Papers.
â
Data entry usually 2-3 times as long
â
Experience dramatically improves
efficiency
â Low immediate reward from mapping
â Relatively few dedicated address
mappers (~ 5% of active mappers)
GPS traces of address surveys in Nottingham &
Maidenhead. Source: OSM contributors & Mapbox
4. ResourcesResources
â Ground Surveys
â Local Knowledge
â Aerial Images
â Bing / MapBox
â Licensed solely for OSM Mapping
â Photos
â During survey
â Geograph
â Mapillary
â OpenStreetView
â National Open Data
â Ordnance Survey StreetView
â LR Prices Paid, NROSH,
Companies House
â Local Open Data
â Planning
â Food Hygiene
â Old Maps
â NLS
â OpenStreetMap Out-of-
copyright maps
5. Typical OdditiesTypical Oddities
â Addresses not located on
road different from name
â Sherwin Walk, Nott'm
â Roads with houses, but
no valid addresses
â Sherwin Walk, Nott'm
â Roads with different
names on each side
â Poultry/Cheapside, Nott'm
â Long Row/Smithy Row, Nott'm
â Multiple inconsistent
addresses
â Austin Reed, N'ham
â (OSGB, NCC, Royal Mail & Austin
Reed each has different version)
â More nesting of levels
than supported by
BS7666
â Leen Court, Nott'm
â Named terraces (Bangor, N.
Wales)
Photo: 1-6, The Garland, Leen Court, Leen Gate, Nottingham NG7 2HR
6. DifficultiesDifficulties
â Gated Developments
â Sheltered Housing
â Modern flats & houses
â Many modern social housing schemes
â Tower Blocks
â Radburn Estates
â In-fill of Victorian/Edwardian streets
â Absence of housenumbers
â Properties with names only
8. OSM Addresses in UKOSM Addresses in UK
â Largest OPEN set of
accurately located data
â Mostly to within 5 m
â Some at delivery point
â Licensed under ODbL
â Viral CC-BY-SA
â Derived data an issue
â OpenData analogue of
OSGB-derived data
â Created for:
â Geolocation
â Thematic interests
e.g., MESH Edinburgh Historical
Atlas (Richard Rodger)
â Local Maps
â General
obsessiveness
9. Distribution of Address DataDistribution of Address Data
â > 800k (August '14)
â Places
â Cambridge
â Tendring
â Wokingham
â Birmingham
â Nottingham
â Broxtowe
â Runcorn
Excludes interpolated address (~ 100k)
Areas shaded in deciles
Centroid area scaled by number
(Birmingham ~ 100k)
12. KeyPad MapperKeyPad Mapper
â Dedicated Address Mapping
â OpenSource Android app
â Supported by ENIaKOON
â German telematics firm
â Owners active OSM contributors
â Simple to use
â Data collected in OSM XML format
â Location not accurate enough
â Smartphone GPS
â Canyon effect
â Battery Life
â Other Smartphone apps
â OSMAnd
â Vespucci
14. OSM-NottinghamOSM-Nottingham
Integrates searching of OSM &
Open Data
â Browsing of open data on a
map
â
Powerful tool to aid address /
post code mapping
â Other
â Restricted to some NG postcode
districts
â Thematic display of OSM data
â Multiple raster layers
http://osm-nottingham.org.uk/
17. Motivating ContributorsMotivating Contributors
More contributionsMore contributions
â Current rely on small core
of address 'addicts'
â Steady drip of one-of
contributions
â Germany has broader
coverage
â 10-times more OSMers
â More activity in small towns
â Local pride
â More manageable task
Imports of dataImports of data
â Imported data gets stale
â Quality rarely as good
as surveyed data
â British community
generally sceptical of
value of imports
â Believed to have limited
OSM in US
18. Project initiated by
OpenStreetMap France
BANO content :
- OSMÂ : 2.2 M addresses
- opendata : 1.2M
- cadastre : 14.9M
As of August 2014
Green : OSM data
Yellow : opendata
Blue : cadastre + OSM*
Red : cadastre only
* matching roads/streets
found in OSM data.
80Â % of municipalities have
a vector based cadastre
http://openstreetmap.fr/bano
BANOBANO
19. addresses.ioaddresses.io
â Initiative of OSM-US Chapter (Ian Dees &c.)
â Repository on Github of metadata for address
open data
â Potentially thousands of available data sets at local
level in US & Canada
â Most information for US & Canda
â Also some France (BANO), Netherlands & South
Africa
20. SummarySummary
OSM UK AddressesOSM UK Addresses
â
Biggest geolocated open
dataset for UK
â Crowd-sourced
â if 2's a crowd
â Mainly ground truth surveys
â Patchy & Partial
â Not yet at critical mass
â Viral Share-alike licence
(OdbL)
â
OSM as an EnablerOSM as an Enabler
â Large test dataset
â Knowledge & skills
â Wide range of tools
covering address data
management
â Community committed to
Open Address data w/w
21. Acknowledgements
â Christian Quest, OSM-FR (BANO)
â Ian Dees, OSM-US (addresses.io)
â Simon Poole, OSM-CH (Address QA)
â Geofabrik, Karlsruhe (OSM Inspector)
â Will Phillips, Nottingham (OSM-Nottingham)
â Matt Williams (OpenPostcodeFinder)
â Harry Wood, London (discussions)
22. Acknowledgements
â Christian Quest, OSM-FR (BANO)
â Ian Dees, OSM-US (addresses.io)
â Simon Poole, OSM-CH (Address QA)
â Geofabrik, Karlsruhe (OSM Inspector)
â Will Phillips, Nottingham (OSM-Nottingham)
â Matt Williams (OpenPostcodeFinder)
â Harry Wood, London (discussions)