[talk-ph] mangroves, tidal lands

maning sambale emmanuel.sambale at gmail.com
Fri Jul 9 08:43:29 BST 2010


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
>>
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>>
>>
>
>
>
> --
> 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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