Good morning,thanks a lot for your reply. It is difficult to see for me how
you could see "by field survey" where administrative boundaries run. This is
impossible, as they are not a physical feature. Therefore, the only valid
reference are the official data. I agree that OSM is quite good, but there are
definitely instances where the borders deviate by "a few metres" or more –
which, for certain purposes, makes a big difference. Indeed, so far I have
corrected mistakes by hand, based on the cadastre. As the only valid data one
could imagine when it comes to administrative boundaries are the official ones
(be it from the cadastre or from ING) it would still, in my opinion, be better
to import those into OSM rather than correcting manually here and there.
On Tuesday, May 7, 2019, 9:58:05 AM GMT+2, Lionel Giard
<[email protected]> wrote:
Hello,
To me this dataset is not necessarily better than what we have in OSM (as we
corrected some border by field survey .... where this dataset is wrong). I
would never "replace" blindly all existing geometry by this one. I think we can
say that we are more or less correct (i never saw errors of more than a few
meters) - and i find it better to improve the current boundaries by hand :
checking the official sources, the reality on the ground, ... For example, i
had a part of a street that i surveyed recently where the addresses changed of
municipality (to have the whole street in the same municipality and not cut it
before the last three houses). We are correct in OSM, but not yet in the
official data (as they don't update often enough). Technically, it is not the
official source for administrative boundaries in Belgium, as the official
source is the Cadastre - which is also open - but it is not yet accurate enough
(even if they are improving it a lot recently).
Le mar. 7 mai 2019 à 09:21, K W via Talk-be <[email protected]> a écrit
:
EN: Good morning, from time to time I make adjustments in OSM where the
boundaries between municipalities in OSM are not exactly following the official
data. However, this is a tedious process, and it would be nice, of course, to
have the exact data for all Belgium municipalities (and former municipalities –
"deelgemeenten"/"sections") in one go.Now, I have seen that it is possible to
download the official border polygons from the site of the National Geographic
Institute for free: IGN - produits - Données numériques . The only problem is
that I have no clue whatsoever how this could be done technically, i.e. to
replace the existing municipal boundaries in OSM by the correct polygons from
IGN. Could anybody help with this?
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NL: Goedemorgen, af en toe maak ik correcties in OSM waar de grenzen tussen
gemeenten in OSM niet precies de officiële gegevens volgen. Maar dat is een
moeilijke procedure en het zou natuurlijk leuk zijn om de precieze gegevens
voor alle Belgische gemeenten (en vroegere gemeenten – "deelgemeenten") in een
keer te hebben.Nu heb ik gezien dat het mogelijk is om de officiële
grenspolygonen van de webpagina van het Nationaal Geografisch Instituut gratis
te downloaden: http://www.ngi.be/FR/FR1-5-2.shtm. Het enige probleem is dat ik
geen idee heb hoe je dat technisch moet doen, dus hoe de huidige
gemeentegrenzen op OSM te vervangen door de correcte polygonen van het NGI. Zou
iemand kunnen helpen?
FR: Bonjour, du temps en temps je fais des corrections dans OSM où les
frontières entre les communes dans OSM ne suivent pas les données officielles.
Mais cela est un processus pénible et il serait agréable, bien sûr, avoir les
données exactes pour toutes les communes belges (et communes anciennes –
"sections") d’un seul coup.Or, j’ai vu qu’il est possible télécharger
gratuitement les polygons officiels des frontières du site de l’Institut
National Géographique: http://www.ngi.be/FR/FR1-5-2.shtm. Le seul problème est
que je n’ai aucune idée comment faire cela techniquement, c’est à dire comment
remplacer les frontières communales existantes dans OSM par les polygons
corrects de l’IGN. Est-ce que quelqu’un pourrait aider ?
DE: Guten Morgen, ab und zu bringe ich Korrekturen in OSM an, wo die Grenzen
zwischen den Gemeinden in OSM nicht genau den offiziellen Daten folgen. Aber
das ist natürlich ein mühsamer Prozess, und es wäre natürlich schön, die
genauen Daten für alle belgischen Gemeinden (und früheren Gemeinden –
"Teilgemeinden") auf einmal zu haben.Jetzt habe ich gesehen, dass es möglich
ist die offiziellen Grenzpolygone auf der Webseite des Nationalen
Geographischen Instituts gratis herunterzuladen:
http://www.ngi.be/FR/FR1-5-2.shtm. Das einzige Problem ist, dass ich keine
Ahnung habe, wie man das technisch machen müßte, mit anderen Worten wie man die
Gemeindegrenzen, die in OSM derzeit existieren, durch die korrekten Polygone
des ING ersetzen könnte. Kann mir da jemand helfen?
Many thanks/hartelijk dank/merci beaucoup/vielen
Dank!_______________________________________________
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