Note that the GRB data mentions it's "voorlopig", and often, the data shows
an offset from parcel boundaries. At those places, I would expect the
boundaries to follow parcel boundaries (and I expect parcel boundaries to
be of better quality).

2016-06-01 19:01 GMT+02:00 joost schouppe <joost.schou...@gmail.com>:

> very true... 100 meters would be vast imho. A difference of 5 meters I
>> would think that is pretty much ok, although the importance of that can
>> be big when borders cross buildings.
>>
>> Exactly, I think the definition of correct is pretty narrow here.
>
>
>> More important: remember that those boundaries usually align on each
>> other, so when you make a admin level 8 smaller, you -probably- also
>> need to modify all others as well. e.g.  If you make north border of
>> Antwerp smaller, you probably need to make Belgium smaller too, AND the
>> province etc.  probably even from level 1 down to 9 if you want to do
>> this well.  At the least we will need to verify them to make sure.
>>
>> Yes, this is something to keep in mind. As long as you don't go splitting
> ways in the wrong place, that shouldn't be a problem though, right? If they
> are properly mapped, boundaries like that should reuse the same segments
> over and over again, so correct one and you correct all the others. E.g.
> http://www.openstreetmap.org/way/87806314
>
>
>
>> GRB data actually has border information if I remember correctly.  some
>> of their map layers (tiles) show the level 8 boundary (a very fine line
>> though, almost invisible).
>>
>> I think this is the one:
> https://download.agiv.be/Producten/Detail?id=1217&title=Voorlopig_referentiebestand_gemeentegrenzen_toestand_29_01_2016
>
>
>
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