Hi
I meant that OSM does not have an agreed way of tagging MLWS or MLW.
https://wiki.openstreetmap.org/wiki/Tag:natural%3Dcoastline
Regards
On 13/07/2019 20:53, Colin Smale wrote:
On 2019-07-13 21:33, Tony Shield wrote:
Hi
Personally think that High Water Mark and Low Water Mark are very
relevant to people and to OSM.
Yeah - tides are a nuisance and can never be predicted with total
accuracy and with Global Warming HWM and LWM will change over time.
Then there are Highest and Lowest Astronomical Tides, and then tides
which increase or decrease according to weather conditions (pressure
and wind) (New Orleans tonight is a good example). There are probably
a few others which I have forgotten....
Knowing the inter-tidal area at Hunstanton is important, as are those
in Morecambe Bay and the River Dee(North Wales/England) where paths
cross the area.
How many beaches are there on the Thames? and what is the inter-tidal
ground like - sand, shingle, mud . . . .And what and where is the
access? These questions are what OSM is about.
The OS recognises this and on their maps marks the coastline/MHW with
a dense line, but not on non-tidal waters.
OSM needs the equivalent of MLW - as far as I know its not defined
(and I do not feel competent to define) - and I think that Borbus is
on the good path.
What exactly do you mean by MLW not being defined? Do you mean that
there is not a robust definition of the concept? Or that it is
difficult to establish the exact line of MLW?
Another reason to want MLW in OSM: The "Extent of the Realm" is *for
the most part* defined as MLWS. This is the limit of the jurisdiction
of normal (local) government. Beyond MLWS, the local council no longer
has any say - it's the UK laws of the sea, as applicable to
territorial waters.
I agree that Borbus is doing good things!
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