Thanks Pierre for this heads up on this two days workshop that sounded really interesting. Excellent day to all,
Best, Nicolas On Tue, Nov 3, 2015 at 10:43 AM, Pierre BĂ©land <pierz...@yahoo.fr> wrote: > #DigiRevCMI New Information Technology Tools in 21st Century Politics > http://www.cmi.no/news/?1585-digital-revolutions > > My presention yesterday was the opportunity to review that last major > OpenSteetMap / HOT Responses in the context of disaster and to show the > various management aspects of such interventions plus quality problems / > management in the context of such responses. > https://twitter.com/pierzen/status/661120335845138432 > > I presented briefly the Semantic analysis I started of the 2015 Nepal > response. Looking at the OSM Planet File for 2015-04-24 (before the > Response) and 2015-06-07 (After the response), I measured how the objects > are related to OSM features. This important measure of quality, completes > other quality measures of OSM data. It also gives us a global measure of > quality, and can help us monitor the progression of the crowdsource effort > and detect rapidly some tagging problems. The first step is to relate > parents / childs (ie. relation, way, node) and find the tags that describe > each OSM Feature. > > Either before or after the Nepal Response, only 1% of the objects cannot > be related to a feature such as highway, building, amenity, etc. No key / > value combination listed on the OSM Map Features wiki page (plus specific > HOT disaster keys). A 1% error shows a high ontologic precision of the > data produced. Data with no feature, is Invisible data. Either, there was > syntax error in the key / value, no tag, or a contributor simply added a > name or note. We need to look more closely at such patterns and find ways > to correct them rapidly. > > To show how we can focus on this "Invisible Data" and cure it, I created > the JOSM NoFeature Mappaint style. It can be selected from the JOSM > Mappaint Preferences. https://josm.openstreetmap.de/wiki/Styles/NoFeature. > This Style shows the key-value combinations I selected for my OSM data > analysis. I invite HOT Validators to use this style and test it while > validating data. > > We also have access to dynamic data (ie data created, modified, > deleted). I will analyze more in detail and try to identify patterns. > Monitoring semantic quality of data produced can help to correct rapidly, > revise instructions, etc. > > This two day workshop is a great opportunity to discuss with other Digital > Humanitarian Network contributors and thanks to Per Aarvik from SBTF and > Bergen Universiy who organized this workshop. > > Pierre > > _______________________________________________ > HOT mailing list > HOT@openstreetmap.org > https://lists.openstreetmap.org/listinfo/hot > > -- Nicolas Chavent Projet OpenStreetMap (OSM) Projet Humanitarian OpenStreetMap Team (HOT) Projet Espace OSM Francophone (EOF) Mobile (FRA): +33 (0)6 52 40 78 20 Mobile (CIV): +225 78 12 76 99 <nicolas.chav...@hotosm.org> Email: nicolas.chav...@gmail.com Skype: c_nicolas Twitter: nicolas_chavent
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