[HOT] Senegal - Dakar Flooding Activation

hyances at gmail.com hyances at gmail.com
Fri Sep 7 04:03:02 BST 2012

¿How to mantain a relation between flood ocurrence and frontier/high?
 Sometimes in developing world construction companies arise (not stilt)
houses in areas where floods has ocurred!  I -- modestly -- think if we put
evidence of flood (hazard) frontier over time (made and know by grassroots)
could help to avoid this kind of situations.

¿Should be nodes or poligons?



2012/9/6 Pierre Béland <infosbelas-gps at yahoo.fr>

> I also agree with these propositions.
> Highway=path seems preferable to higway=footway.
> For flood hazards, Stephane propositions give the possibililty to take
> account of various hazards. The hazard_prone and hazard_type tags should
> replace the flood_prone=yes tag that is presently used.
> Pierre
>   ------------------------------
> *De :* nicolas chavent <nicolas.chavent at gmail.com>
> *À :* Mike Dupont <jamesmikedupont at googlemail.com>
> *Cc :* william skora <skorasaurus at gmail.com>; hot at openstreetmap.org
> *Envoyé le :* Jeudi 6 septembre 2012 17h42
> *Objet :* Re: [HOT] Senegal - Dakar Flooding Activation
> Hey there-
> Back from Senegal a couple of days ago and will blog soon around the
> TechCamp, the flooding and the status of OSM there
> First thanks to all those who contributed to this response: the progresses
> of the map are important and your work had a strong impact down there
> amongst the TechCamp participants as well as among GISers I met from the
> UN, Gov Agency, Academics and Techs. Furthermore it fostered the
> remobilization of the nascent Senegalese OSM community by heating things
> up.
> A few point on this tagging thread.
> * highway values most likely to be used and fit for these areas of
> Dakar, I'd like to echo Will and others on *residential*, and strongly
> support Jaakko's views on *path *(vs footway) which seems well suited for
> the most narrow streets. I would refrain when mapping remotely to use
> living_street which calls for on-the-ground knowledge and de facto right of
> way between vehicle and pedestrians. This is a tag to better explain/
> portray and push to the mappers down there. More generally, with Jaakko,
> Brian and Sev we feel a need to better articulate guide on using highway
> values below tertiary in developing countries.
> * surface values: I would use from the imagery *paved/unpaved*, a great
> deal of unpaved roads in Pikine and Guediawaye are *sand*
> * On the squares/ piazzas, I feel like Harry and would refrain from
> tagging them leisure=*pitch/ playground* and/or *parking* since those
> uses are really changing over time in the course of the day. Those usages
> also apply to a good deal of streets where as a kid, I learned playing
> street soccer and hanged out for long hours in wedding/ funerals and later
> party. I would then stick to Harry's call: highway=pedestrian and
> area=yes + drawing roads (highway=residential) along the edges of the area
> * Flooding related tags. I like the work started by Stephane and think
> that it would be worth taking advantage of this flooding to solidify and
> generate consensus on the tags
> In the mapping party we held in Dakar last Saturday, we pushed forward the
> following tags to map on the ground the worst hit areas in the view of
> building a datasest of flood prone points.
> hazard_prone=yes
> hazard_type=flood
> 2012:flood_height=
> 2009:flood_height=
> 2007:flood_height=
> We will be waiting for satellite imagery processing to get the various
> extents (OCHA tasked UNOSAT to carry out such a work with imagery requested
> through the Charter)
> Again thanks.
> Nico
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