[OSM-talk] Fwd: Fix maritime borders of Ceuta and Melilla (Spain)

[Martin Koppenhoefer]

Am Sa., 20. Feb. 2021 um 17:32 Uhr schrieb Colin Smale <
colin.smale at xs4all.nl>:

> One other thing to watch out for: Baselines are based on interpretations
> of the coastline, which in this case is defined as low-water. In OSM the
> concept of coastline is linked to high-water. So therefore we can't extract
> or calculate maritime baselines from OSM data, except in areas where
> low-water marks are present, such as the UK, where the administrative
> jurisdiction normally extends to low-water so we get this data for free
> when the admin boundaries are imported from Ordnance Survey data. There are
> however anomalies in certain specific areas (like the Bristol Channel and
> Brighton Marina to name but two).
>


I don't know the situation in other countries, but in Italy there is a law
which has all the points of the official baseline. You cannot get it from
the coastline, it is a series of points (e.g. light houses).

Cheers,
Martin
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