[OSM-talk] 12nm territorial borders - useful or rubbish?

edodd at billiau.net edodd at billiau.net
Mon Feb 14 10:47:16 GMT 2011


>>  I've been thinking about the 12nm territorial borders on sea that
>> we have in many places, notably in Europe. Many of them seem to have
>> been auto-generated by simply placing a buffer around the coastline.
>>
>> My first question is, do they really have legal significance? They
>
> Just that it's clear that not all are automatically generated:
> at least the Finnish border at the sea between Finland and Sweden
> (and Estonia) was translated (another coordinate system) from a Finnish
> law
> containing the corner points - the zones of different countries
> even meet at three sections, and thus affect the distance from
> the shore.
>
>

the questions become
1) are the sources of the lines marked?
2) are the positions of the lines rated as to certainty?
3) how would a mapper reviewing them decide where to work next?
4) should they be rendered in mapnik?
5) should they be in a file formatted for garmin users?
6) how do we communicate the accuracy to garmin users?

i think that they are valuable pieces of information which need to be very
accurate to be useful. Currently rendered in purple on mapnik they are
more noticeable than the coastline, which may suit some purposes, but
looks quite odd on island states.






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