Crowdsourcing, User Generated Content i Authoritative data <a href="http://www.vector1media.com/spatialsustain/whats-the-distinction-between-crowdsourcing-volunteered-geographic-information-and-authoritative-data.html">http://www.vector1media.com/spatialsustain/whats-the-distinction-between-crowdsourcing-volunteered-geographic-information-and-authoritative-data.html</a> via marctorres<br>
<br>Raf<br>