[Tagging] Coastline for rivers, estuaries and mangroves?

Colin Smale colin.smale at xs4all.nl
Mon Sep 3 21:40:02 UTC 2018


On 2018-09-03 23:08, Christoph Hormann wrote:

> On Monday 03 September 2018, Colin Smale wrote: This is essentially the situation we have right now.  Judgement of
> local mappers is usually fine (with the exception of political
> cases like the Rio de la Plata).  Most problems occur because
> armchair mappers misinterpret the local situation or when
> inexperienced mappers are unaware of the significance of
> distinguishing between ocean and riverbank mapping. 
> What guidance do we give to the local mappers?

What is currently written on the wiki which includes the proposal which 
is linked to from the coastline documentation.

> Given a properly formulated rule-of-thumb, why should remote armchair
> mappers come to a different conclusion to local mappers in this case?

As said this is mostly due to misinterpreting imagery. 

That can account for a few metres either way (perpendicular to the
shoreline), but not for the difference between tidal limit and a
"convenient crossing point near the sea". That is purely a personal
judgement, not misaligning imagery. After all, we are not disputing here
the location of the sides of the river, but where we draw the line from
one side of the river to the other.
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