[OSM-talk-fr] Limites administratives espagnoles et frontières avec la France

[Skywave]

2009/12/5 Christophe Merlet (RedFox) <redfox at redfoxcenter.org>:
> Le samedi 05 décembre 2009 à 14:56 +0100, Skywave a écrit :
>> I was talking about the comparison between Cadastre and the Spanish
>> Data, i don't have the exact data of the borderstones, but the Spanish
>> data seems to be following it more, the Cadastre data has more curves
>> but the difference is measured in centimers not meters. There are a
>> few bordersstones in the database, one by me, a couple by others, they
>> match both the Cadastre and the Spanish data. But imo if you would
>> draw a line between each borderstone it would look more like the data
>> from the Spanish source
>
> Now, I know the tag for borderstone (historic=boundary_stone) :)
> but it's not rendered by mapnik :(
>
>> And i know the difference between cadastre, CIA, and the Spanish data,
>> as they were imported by me in that region. Cadastre.fr has of course
>> also country borders as they share borders, the Spanish data i got
>> from a file sent by the importer, the CIA data should be deleted as
>> soon as possible.
>
> OK, that allright.
>
>> The data from the French cadastre is just fine for the purpose in OSM,
>> i have only slightly altered the existing Cadastral borders in the
>> Pyrenees Orientales: i cleaned out some unnecessary nodes and cutted
>> it in pieces to fit in the Spanish relations. I've deleted the
>> Andorrian-Spanish border, as it was from the CIA world databank
>>
>> http://www.openstreetmap.pl/balrog/limites-omitidos.osm.bz2
>
>
> Beware with your limits, it's not always better. It does not follow
> natural border like river
>
> Arneguy
> http://sautter.com/map/?zoom=16&lat=43.10889&lon=-1.28235&layers=00B000TFFFFF
>
> Border stone #225
> http://sautter.com/map/?zoom=18&lat=43.00806&lon=-1.14266&layers=00B000TFFFFF
> (here, french cadastre is also not really exact :/ Track way from my own
> GPS should be in France...)
>
>
>        Librement,
> --
> Christophe Merlet (RedFox)
>

My piece of border mainly existed out of Col's and peaks, not many
rivers, couple of streams probably.
The limits will probably always be different in different sources and
i presume nobody in the real world cares either about that small
surface of rock ;). Openstreetmap will never be able to really check
the whole border.
For that borderstone, keep in mind, GPS isn't very precise either.