Post on 13-Jan-2016
Die Interaktion zwischen Crowdsource-Daten
und Regierungsdaten.
Können wir die Einbahnstrasse überwinden?
Simon PooleSwiss OpenStreetMap Association
OpenStreetMap is ...
a free and open crowd-sourced database of geographic information
NOT an online map provider a ecosystem of applications and service
(commercial) providers a consumer of open data
Examples of OGD in OSM
U.S. Geological Survey (USGS) French Cadastre Communal administrative borders Switzerland Public transport stops Switzerland (DIDOK)
rollstuhlkarte.ch
DIDOK List
roughly 30'000 public transport stops data is submitted to the BAV by the PT
operators contains location information, UIC id is used by the SBB, Google, OSM and many
others
Short Walk
OSM
Longish Walk :-)
Government Data is sometimes ...
WRONG
DIDOK Errors
Positional errors in original 2010 import ~15%
Roughly 20'000 stops have been “verified”
Feedback from the use of OGD in crowd-sourcing projects has the potential to support detecting
and removing errors.
Barriers
Interest is data quality for the data owner relevant and
important? does the “improver” even want to make his
work available (competitive advantage)? Legal
crowdsourcing projects typically have restrictive and potentially viral licences (CC by-SA, ODbL ..)
OGD licences don't necessarily have terms that require improvements to be made available
The OSM Licence Mixer
Solutions?
Everybody uses OdbL :-) OSM allows additional distribution licences Technical separation of edits (corrections) to
imported data Only use OSM as a hint that data may have to
be resurveyed/collected
rollstuhlkarte.ch by Thomas Ineichen
didok.osmd.ch DIDOK – OSM comparision by Michael Spreng
sosm.ch Swiss OpenStreetMap Association
Simon Poole simon@poole.ch