Hi Frank,
I wanted first to stop imports of boundaries. Otherwise
it will be a nightmare. I will contact individually each person who
imported data in the Québec area and invite them to stop imports and
participate to the discussion.
Like in the Netherlands, I think
that it is important to centralize import of the boundary data to assure
some homogeneitiy and the possibility to revise easily. Presently,
some limits are made differently from one place to the other (ways +
boundary relation) vs (one way that make all the contour of the city).
Various sources are used wich make the boundaries to overlap. Some
limits are incompleted.
The OSMOSIS tool from the OSM France community is very usefull to see problems
with incomplete boundary relations.
See
http://osmose.openstreetmap.fr/map/?zoom=7lat=44.38955lon=-75.57996layers=B00FF0FFTFFFTitem=1010,1040,1100,1150,1160,1170,3170,4090,6010,6050,6060level=1,2,3
By the way, this shows incomplete boundary relations for many areas in Canada
an USA.
But
it does not show hidden boundaries under the blanket where only ways
are used like in Brossard and Laprairie. The polygon for Laprairie is
complete but a Nominatim search for Laprairie will give no result.
http://www.openstreetmap.org/browse/way/24790856
http://www.openstreetmap.org/browse/way/20014468
This
type of work is determinant for Nominatim searches. This dramatically
increase the usability of OSM data if done properly. The best would
probably be that each province community takes care of doing the job and
eventually update. Also, I dont think that the limits should be placed
in individual Canvec files. It would be better to
produce files for each province.
I will contact RNCAN and ask
about status of the data and their plans about this. Until now, Québec
data was available. If necessary, I will also contact people working
for the Québec government.
Pierre
De : Frank Steggink stegg...@steggink.org
À : talk-ca@openstreetmap.org
Envoyé le : Vendredi 5 octobre 2012 2h19
Objet : Re: [Talk-ca] Import des limites administratives, municipalités du
Québec
Hi Pierre,
If I recall correctly, Daniel once mentioned that the municipality boundaries
were to become part of Canvec. I don't know when that would eventually happen,
but he or someone from NRCan might confirm that. Or someone who has
connections in the Quebec government might attempt to persuade them to attach
a better license to the boundaries which have currently opened up.
As for removing the incorrect data: did you try to contact the users already,
and how did they respond? I see no problem if the data is clearly wrong,
and/or when the users cannot provide clear sources. Boundaries aren't
something you can see on the ground (except for a few individual markers). On
the other hand, if both conditions are satisfied (quality and source), then
you can't just delete existing boundaries, without discussing it with the
contributing users first. This would only be the case on the Isle of Montreal,
if I understand correctly.
As for centralizing the import: in the Netherlands we have centralized it as
well. This is giving good results, since it is clear where the
responsibilities are. Generally once a year the boundaries are updated,
because adjustments being made are becoming in effect usually on January 1st.
Regards,
Frank
Quoting Pierre Béland infosbelas-...@yahoo.fr:
Les données de limites administratives sont déterminantes pour assurer une
recherche par nom de rue et municipalité dans OSM. Dans ce contexte,
plusieurs contributeurs du Québec ont commençé à importer des données de
limites administratives pour les municipalités, dans les régions de Québec,
Îles-de-la-Madeleine, Montréal, Rive-sud, Saint-Jean-sur-Richelieu et
Labelle. De façon générale, les sources de données ne sont pas indiquées,
et il y a parfois des chevauchements (exemple entre Laprairie et
Saint-Jean-sur-Richelieu.
En faisant une recherche sur les chemins et relation de limites
administratives déjà saisis, j'ai constaté que plusieurs limites étaient
incomplètes et donc inopérantes. J'ai ainsi réparé les limites de plusieurs
municipalités sur l'Île de Montréal. Les villes de banlieu et Montréal
s'affichent maintenant correctement et il est possible de faire une
recherche à partir d'un nom de rue. Sur la Rive-sud, des limites saisies par
des contributeurs pour Brossard et Laprairie sont actuellement incomplètes
et inopérantes.
Dans l'ensemble on se retrouve avec des données disparates dont ont ne
connait pas toujours la provenance. Ces données se chevauchent, sont de
formes différentes, ce qui rendra de plus en plus difficile à assembler ce
puzzle si on poursuit dans cette direction.
Au cours des deux dernières semaines, j'ai corrigé plusieurs relations
définissant les limites de municipalités du côté de Labelle et à Montréal.
Et j'ai pu
