Thanks for pointing to this one, certainly much more useful and general than adding natural=mangrove.
Mike Limerick At 03:27 PM 11/07/2008, Ulf Mehlig wrote: >There is a "wetland" proposal which includes wetland=mangrove. > >http://wiki.openstreetmap.org/index.php/Proposed_features/Wetland_areas > >In the area where I am working at the moment > >http://www.openstreetmap.org/?lat=-0.85&lon=-46.991&zoom=9&layers=0B0FTF > >(almost) all the coastline is drawn along the outer border of mangrove >forests, so it is considered as "land". I tagged mangroves at > >http://www.openstreetmap.org/?lat=-0.8964&lon=-46.6742&zoom=12&layers=0B0FTF > >as natural=wetland tentatively ... I would like to see the wetland tag >voted/approved/rendered -- it could help to map a not-so-small part of >tropical coastlines correctly! > >BTW, there is a mangrove island in this area rendered correctly in >Osmarender but not in Mapnik, in spite of a multipolygon relation which >is correct in my opinion: > >http://www.openstreetmap.org/?lat=-0.95206&lon=-46.66697&zoom=15&layers=0B0FTF > >Ulf > >On Wed, 2008-07-09 at 22:21 +0100, Mark Williams wrote: >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA1 >> >> natural=marsh? >> (from Map Features) >> >> I would expect to find coastline on the open-sea border of this. >> >> Mark >> >> Mike Collinson wrote: >> > I agree with Stephen's comments and add that I follow the rule "if in >> > doubt, map it as land" since we don't have the luxury of being able to map >> > average high water marks or highest spring tide mark that a government >> > agency might use. If it is something that I can walk out and see most of >> > the day or year, then I think it should be mapped as land as a navigation >> > aid. >> > >> > It might also be worth considering a natural=mangrove area tag. Our >> > current system is biased towards temperate climates. I've hesitated so >> > far as it is often very difficult, either on the ground or from imaging >> > data, to map the inland extent. >> > >> > Mike >> > >> > At 03:27 AM 9/07/2008, Stephen Hope wrote: >> >> The northern coast of Australia has many Mangrove marshes at river >> >> mouths, some of them extending many kilometres away from the dry shore >> >> line. PGS shows these areas as sea, because they are not dry land - >> >> and that is were the coastlines would have been imported from. Note >> >> that "being submerged for half the year" doesn't mean the trees are >> >> covered with water, just the mud under them. The tree tops would be >> >> above water all the time, I suspect. >> >> >> >> We've (mostly) tagged them as land, with the coast being on the sea >> >> side of them. Technically they may be water covered (or partially >> >> water covered, usually about 6 inches deep), but if you can't swim or >> >> boat in them and plants and trees grow there it's land as far as I'm >> >> concerned. They certainly are not ocean. Marshes in the UK are also >> >> treated as land from the coastline point of view, even were they edge >> >> an ocean. >> >> >> >> See >> >> http://www.openstreetmap.org/?lat=-16.9642&lon=145.7843&zoom=13&layers=B00FTF >> >> for an example near Cairns. More examples are further up the coast. >> >> >> >> Stephen >> >> >> >> >> >> 2008/7/9 Alan Millar <[EMAIL PROTECTED]>: >> >>> I came across an interesting area which I don't know how to map or tag. >> >>> >> >>> http://www.openstreetmap.org/?lat=22.066&lon=89.047&zoom=9&layers=B00FTF >> >>> >> >>> This is the Sundarbans mangrove forest on the border of India and >> >>> Bangladesh. The map doesn't look like much, but look at the map with >> >>> aerial photos like in Potlatch edit mode and it starts to get >> >>> interesting. >> >>> >> >>> I read that it is submerged for up to half of the year. The Yahoo aerial >> >>> photos clearly show the forest areas, so I assume they were taken at a >> >>> low-water period. Google Maps shows it as land. >> >>> >> >>> Our oceantiles file has it as land, but our coastlines treat it as sea. >> >>> Our coastlines stop at the farmlands which border it. During the high >> >>> water period, I suppose our coastlines make sense. >> >>> >> >>> Does anyone have any recommendations of how to treat an area like this? >> >>> Any similar geography already mapped somewhere? Thanks >> >>> >> >>> - Alan >> >>> >> >>> >> >>> >> >>> ________________ >> -----BEGIN PGP SIGNATURE----- >> Version: GnuPG v1.4.6 (GNU/Linux) >> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org >> >> iD8DBQFIdSv1JfMmcSPNh94RAty+AJ9voJsnb9ym6eiFMB9dNJFaHg5WpACfUWAO >> we9MgNpK8v5miRbnCw+4tU4= >> =tGCg >> -----END PGP SIGNATURE----- >> >> >> _______________________________________________ >> talk mailing list >> [email protected] >> http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk >-- > Ulf Mehlig <[EMAIL PROTECTED]> >----------------------------------------------------------------------- > > >_______________________________________________ >talk mailing list >[email protected] >http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
