[HOT] Senegal - Dakar Flooding Activation

[hyances at gmail.com]

¿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?

Thanks,

Humberto

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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