2012/9/6 Richard Fairhurst <rich...@systemed.net>: > Je serai heureux d'ajouter réprojection Lambert->spherical Mercator à > Potlatch 2.
Salut Richard > L'accès aux images avec cookie sera moins facile, mais on peut créer un > proxy cadastre_tools (sur dev.osm.org peut-être). Malheureusement quand > j'essaie > > richard@errol:~/cadastre$ ./cadastre_client.py 399409.28@165107.11 > 405833.71@171964.30 3800 Caen 14 caen_city.png > > le resultat est entierement blanc > (http://richard.dev.openstreetmap.org/caen_city.png). Peut-etre vous pouvez > m'aider? This is because you use the coordinates in the previous projection system Lambert 4 zones in your request. Since almost 2 years, the WMS works with Lambert CC 9 zones projections. I say "projections" because it works with different values in 9 zones depending on the French département number (not a latitude). The script cadastre_client.py is too old (2008). I would recommend a more recent script which seems to be simpler to use : "cadget" (http://wiki.openstreetmap.org/wiki/WikiProject_Cadastre_Fran%C3%A7ais/cadget) Using a centralized wms proxy is the 3rd solution but I don't know if the main cadastre.gouv.fr will support this. The problem is if you request multiple municipalities in parallel, one for each of the P2 client. I think that currently only one session (cookie) is allowed per IP (to be checked). Probably you will have to open/close the session for each request and I don't know how the WMS will react on this if you have 50 or 100 users calling the cadastre layer at the same time (and not speaking about the performance). Another point is that you will have to introduce a dialog first in P2 asking the municipality name. Since the municipality names are not always unique within France (or even within the same département) or syntax might be different, you could receive an answer from cadastre.gouv.fr containing a list of municilities and their correct cadastre ID. Then you should ask the user to select one of them. If the current view does not correspond to the municipality projection (don't forget, we have 9 zones), the result might be a blank image. You can find more details about the special WMS protocol on the wiki (http://wiki.openstreetmap.org/wiki/WikiProject_Cadastre_Fran%C3%A7ais/Aspects_techniques_du_cadastre_en_ligne). I could expand it with the details about how to retrieve CODE field (the municipality ID within the cadastre system). What I'm saying here is only for the municipalities in vector format and for French départements in Europe land (including Corsica). About one third of the municipalities are not vectorized and the http requests work a bit differently. Also the overseas départements use other projections (http://wiki.openstreetmap.org/wiki/WikiProject_Cadastre_Fran%C3%A7ais/Formats_et_projections). Pieren _______________________________________________ Talk-fr mailing list Talk-fr@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-fr
