Thanks Severin for turning the contents of this Burkina Faso workshop into those structured wikipages. Nico
On Sun, Jul 6, 2014 at 3:06 PM, Severin Menard <severin.men...@gmail.com> wrote: > Hi, > > When we get recent imagery over areas that have already been mapped with > Bing imagery, very often it does not have exactly the same georeferencing, > and very often we do not have any trace or not enough to fix this. > Consequently, either the contributor will offset the new imagery on the > vector data, or on the contrary will move the vector data. It results the > map becomes less consistent it was before. > > To solve this, when partnering with GISCorps to map Malakal > <http://tasks.hotosm.org/job/413> in South Sudan, I had created a grid of > offset correction points with the great offset_db plug-in for JOSM > <http://wiki.openstreetmap.org/wiki/Imagery_Offset_Database> so that > every contributor could, in two clicks, get the new imagery aligned on the > Bing imagery, easily update the data and keep the data consistency. It > worked really well. > > As we will get more and more access to recent imagery, my idea was to find > a way to repeat this without relying to the previous action of a single > person and spread the use of the offset_db plugin. Recently, in a workshop > with various contributors in Burkina Faso, I tested a workflow involving > the Tasking Manager and it worked also well. > Next step is now to involve the crowd to this process. I created an OSM > wikipage both in French and English (any correction by native speakers > would be appreciated) : > http://wiki.openstreetmap.org/wiki/OSM_Tasking_Manager/Offset_db > > and created a job for Bossangoa (http://tasks.hotosm.org/job/578) in > Central African Republic, because our partners from the HIU kindly provided > a recent NextView Imagery. > > Once you catch the workflow, you will see it is really quick to create > offset corrections points and the outcome (the data consistency) are really > substantial. > > Please join! > > Sincerely, > > Severin > > _______________________________________________ > HOT mailing list > HOT@openstreetmap.org > https://lists.openstreetmap.org/listinfo/hot > > -- Nicolas Chavent Humanitarian OpenStreetMap Team http://hot.openstreetmap.org/ Mobile (FRA): +33 (0)6 52 40 78 20 Email: nicolas.chav...@hotosm.org Email: nicolas.chav...@gmail.com Skype: c_nicolas Twitter: nicolas_chavent
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