Le jeudi 11 août 2011, "Marie-Noëlle Augendre" <[email protected]> a écrit:
> Hi, > > I'm trying to create some maps using screencopies from Geoportail: > http://www.geoportail.fr/5069711/visu2D/afficher-en-2d.htm?cg=djoxLjEqYzptZ > XRyb3BvbGUqY3Y6MS4wKnZ2OjEuMSp4eTozLjYxOTA4ODQ0MjMwODUwNzJ8NDQuMzQ1Mjk4NDM2 > NjYzMDkqczo3KnB2OjEuMCpwOmRlY291dmVydGUqbDpTY2FufDF8fA%3D%3D However, as I > cannot retrieve accurate coordinates from this website, I plan to get them > from Google Maps > http://maps.google.fr/maps?q=44.359451,3.657417&ll=44.323602,3.740158&spn=0 > .189123,0.31826&sll=46.75984,1.738281&sspn=7.619431,12.941406&num=1&z=12 > because it can give latitude/longitude for a precise point. I think the reading from the cursor position just below the map is more precise than the map itself (0,1'' is about 3m, isn't it?) > > But I dont know how to set up the coordinates/projection/mode/etc. in > the "convertir un fichier Tiff au format Geo Tiff par > géoréférencement" screen of QLandkarteGT. Is there some HowTo > somewhere? Or could you provide some explanation? On geoportail, the "réseau géodésique français 1993" is in use. From wikipedia: http://fr.wikipedia.org/wiki/R%C3%A9seau_g%C3%A9od%C3%A9sique_fran%C3%A7ais there are few cm only between this system and the WGS84, which is default for me, and easy to select using the wizard: the other sources of error are much bigger. > > Additionally, I'd like to know whether I need to assemble all my > screecopies in one huge file in order to have one map; or is it > possible to navigate to one map to the adjacent one without having to > group all of them in one. I had few separate raster map displayed together... It's maybe the easiest way to overlap the files correctly. Regards, PS: je serai peut être plus précis et compréhensible en m'exprimant en français, mais pas sur la liste... N'hésite pas à me recontacter en privé si nécessaire. -- Didier Hérisson Clef publique 0x18A22FF2151D17C2
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