[talk-ph] mangroves, tidal lands

maning sambale emmanuel.sambale at gmail.com
Sun Jul 11 08:51:49 BST 2010


@ ed,

I guess the right tag would be:
natural=wetland
wetland=mangrove
http://wiki.openstreetmap.org/wiki/Mangrove

Didn't saw that page when I tagged them last year.  Changing tags now.

On Fri, Jul 9, 2010 at 10:54 PM, Ed Garcia <eppgarcia at gmail.com> wrote:
> @maning,  I looked at your mangroves at Lian ... the coastline is actually
> traversing the mangrove area, half on land and half on ocean, but it is
> still being rendered as whole land.
>
> I believe it is because you used the landuse:forest tag  while I used
> natural:wetland tag as suggested by OSM for mangrove areas.
>
> The natural:wetland does not render as a green patch when it is on the water
> side of the coastline.
>
> shall I use landuse:forest instead of natural:wetland instead?
>
> On Fri, Jul 9, 2010 at 10:09 PM, <jeroen at bohol.ph> wrote:
>>
>> Can't find Mangrove here as a separate category. I believe normally
>> coastlines are high-high waterlines. See this picture on my (site
>> http://www.bohol.ph/picture206.html) for looks off a mangrove (near Loay,
>> Bohol); this land will submerge a high tide. Picture can be used under CC-BY
>> or CC-BY-SA if needed.
>>
>> Jeroen.
>>
>>
>> Quoting maning sambale <emmanuel.sambale at gmail.com>:
>>
>>> A proposed  water_cover tagging:
>>> http://wiki.openstreetmap.org/wiki/Proposed_features/Water_cover
>>>
>>> On Fri, Jul 9, 2010 at 3:39 PM, maning sambale
>>> <emmanuel.sambale at gmail.com> wrote:
>>>>
>>>> On Fri, Jul 9, 2010 at 11:15 AM, Ed Garcia <eppgarcia at gmail.com> wrote:
>>>>>
>>>>> Can I have your opinion on this, guys?  it is about coastal mangrove
>>>>> areas.
>>>>> It is suggested, and I agree, to map mangrove areas as inland (inside
>>>>> the
>>>>> coastline).  But I encountered the mangrove areas at Alburquerque,
>>>>>  Bohol and
>>>>> the mangroves (seen on wms Lansat) are currently lying on the ocean
>>>>> side.
>>>>> The current coastline is along the actual edge of what is definitely
>>>>> the
>>>>> actual land.  I have personally seen the coast myself when I was in the
>>>>> Albuquerque area.
>>>>>
>>>>>
>>>>> http://www.openstreetmap.org/?lat=9.6127&lon=123.954&zoom=14&layers=B000FTF
>>>>>
>>>>> Question:  Shall I move the coastline seaward so that the mangroves
>>>>> would
>>>>> apear inland?
>>>>
>>>> IMO, no.  Some mangroves in Lian, Batangas are more on the sea side.
>>>> Hence, I didn't move the the coastline.
>>>>
>>>> http://osm.org/go/4yfxfytF5-
>>>>
>>>> I've walked around these mangroves stands for two full days.
>>>>
>>>>> This would in a way state that mangroves (or tidelands) are
>>>>> land and thereby also state that coastlines for tidal lands and  flats
>>>>> are to
>>>>> be drawn using the exposed areas during the lowest low tide (not just
>>>>> the
>>>>> mean tide as this will "cut" some mangrove areas in half).   Classic
>>>>> case for
>>>>> tidal flats are in Calatagan, where the low tide exposes an  additional
>>>>> 150+m
>>>>> of "land".
>>>>
>>>> I have this similar case in Talim Bay (Lian, Batangas).  During low
>>>> tides, the inter-tidal flats (locally known as tangkulan) are in
>>>> hundreds of meters from the mean coast.
>>>>
>>>> http://farm2.static.flickr.com/1440/541589816_bf5bf812a2_b.jpg
>>>>
>>>>> Also, the above considers that some islands become "land" only on  low
>>>>> tides.
>>>>
>>>> The "if in doubt, map as land" mantra applies only if you're
>>>> unfamiliar with the area.  For everything else, it's your call
>>>> provided you have verified on the ground.
>>>>
>>>> I think we should map inter-tidal zones as lines (this needs to be
>>>>  defined more)
>>>>
>>>>
>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> website administrator:
>>>>> - www.waypoints.ph
>>>>> - reeflife.eppgarcia.com
>>>>>
>>>>> PADI Divemaster #491048
>>>>>
>>>>> _______________________________________________
>>>>> talk-ph mailing list
>>>>> talk-ph at openstreetmap.org
>>>>> http://lists.openstreetmap.org/listinfo/talk-ph
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> cheers,
>>>> maning
>>>> ------------------------------------------------------
>>>> "Freedom is still the most radical idea of all" -N.Branden
>>>> wiki: http://esambale.wikispaces.com/
>>>> blog: http://epsg4253.wordpress.com/
>>>> ------------------------------------------------------
>>>>
>>>
>>>
>>>
>>> --
>>> cheers,
>>> maning
>>> ------------------------------------------------------
>>> "Freedom is still the most radical idea of all" -N.Branden
>>> wiki: http://esambale.wikispaces.com/
>>> blog: http://epsg4253.wordpress.com/
>>> ------------------------------------------------------
>>>
>>> _______________________________________________
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>>
>>
>>
>>
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>
>
>
> --
> website administrator:
> - www.waypoints.ph
> - reeflife.eppgarcia.com
>
> PADI Divemaster #491048
>
> _______________________________________________
> talk-ph mailing list
> talk-ph at openstreetmap.org
> http://lists.openstreetmap.org/listinfo/talk-ph
>
>



-- 
cheers,
maning
------------------------------------------------------
"Freedom is still the most radical idea of all" -N.Branden
wiki: http://esambale.wikispaces.com/
blog: http://epsg4253.wordpress.com/
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