Just see wiki.openstreetmap.org/wiki/Tag:hazard=flooding Regards, Illia.
Cornelia Scholz via Tagging <tagging@openstreetmap.org>: > Hi all, > > Many thanks for the responses and feedback! :) Here a few comments: > > - The aim would be to collect information on historic floods and community > knowledge of hazard exposure. I work for the Red Cross Climate Centre on > hazard assessments in typically data scarce areas (e.g. East Sudan). While > in many western countries most flood areas have high-quality flood maps > derived from scientific flood models, in those areas we lack this > information. There are of course global flood models, but they lack > verification and validation on a local level in many areas I am looking > into. Especially there, being able to capture information of historic, true > flood extents and community knowledge is crucial to fill those data gaps > and improve disaster risk reduction efforts. > - I reviewed existing tags and tag info, but I thought it lacked some > uniformity. While with boundary=hazard and the added value there already > exist approved natural hazard tags which I find make more sense to add in > here. > - The OpenHazrdMap was set up as Wiki Page but wasn`t followed through and > no voting or approval for suggested tags was carried out. > > Please let me know what you think, and whether you would approve to adding > the flood value 'flood' as value to the key 'hazard' (to be used in > combination with the tag boundary=hazard). > > All the best and many thanks, > Cornelia > > > On Fri, Jun 16, 2023 at 9:13 AM Jez Nicholson <jez.nichol...@gmail.com> > wrote: > >> Noted. >> >> >> I was [over]reacting to the section from OP about return periods. >> >> If this proposal is specifically about areas of historical flooding >> rather than areas deemed at risk of flooding then they *can* be observed >> on-the-ground. >> >> On Fri, 16 Jun 2023, 01:08 Andy Townsend, <ajt1...@gmail.com> wrote: >> >>> On 15/06/2023 20:47, Jez Nicholson wrote: >>> >>> Whilst it is a great idea to capture local knowledge about flooding, >>> especially where it is currently not available, I am concerned that this >>> doesn't have on-the-ground verification. >>> >>> I don't think that anyone has suggested that - at least not in this >>> thread? >>> >>> The original email said "The location and extent of these hazard areas >>> is often well known by local communities with knowledge of past events." >>> >>> When I talked about "what is currently flooded based on current >>> measured level and previous observations" I meant exactly that - >>> recording that when a river level at a known point reads X, land at Y (in >>> the vicinity of X) will also be flooded. >>> >>> >>> Flood risk areas are predictions generated via modelling software and it >>> depends on which software you use, and the quality of the input data. >>> >>> Indeed - the Environment Agency in the UK (and other agencies elsewhere) >>> make extensive use of this sort of model, but I suspect that mapping this >>> sort of thing goes bit beyond what can usefully done within OSM, though of >>> course it can be combined with OSM data by a data consumer to create "risk >>> maps". >>> >>> >>> The current hazardous areas get away with it by mapping areas marked out >>> by signage. Sure, the signs may have been placed following predictions, but >>> they are physically there to be seen. >>> >>> I suspect that this isn't true for all "boundary=hazard" in OSM at the >>> moment (picking one at random, the signage for >>> https://www.openstreetmap.org/way/500428513 and the wider >>> https://www.openstreetmap.org/relation/15680620 doesn't look especially >>> extensive - see >>> https://www.abc.net.au/radio/programs/australia-wide/australia-wide/13490888#:~:text=Wittenoom%20is%20the%20largest%20contaminated,site%20in%20Western%20Australia%27s%20Pilbara. >>> ) >>> >>> Best Regards, >>> >>> Andy >>> _______________________________________________ >>> Tagging mailing list >>> Tagging@openstreetmap.org >>> https://lists.openstreetmap.org/listinfo/tagging >>> >> _______________________________________________ >> Tagging mailing list >> Tagging@openstreetmap.org >> https://lists.openstreetmap.org/listinfo/tagging >> > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging >
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