Hi Tim, like I said, I want to "convert" a filled contours map generated with Basemap (example here : http://imagebin.ca/view/3nYnN3.html) to a polygon shapefile (vector). The filled contours are from a regular points grid which can already be saved into a point shapefile (via ogr python bindings) and I use QGIS to render it. Now I search to get the filled result into a shp file to pass it through "ogr2ogr -f KML" and render it with GoogleEarth. I know I can do all this process with the QGIS-GRASS interface, but I must limit softwares dependencies 'cause it'll be placed on a web server, and I think Python it's the best choice for doing that :-) After multiple tests, I can retrieve the polygons points coordinates via matplotlib.Patch and save them in a shp file. Now I have troubles with "real" coordinates and meta-datas, but nothing impossible :-)
Tim Michelsen a écrit : >> Looks like I've done a mistake with my last post, sorry Eli... >> I know how to save datas to a shapefile with the OGR library but only >> for points datas. >> > > > >> I'll appreciate if somebody can point me how to save a filled contour >> map basemap into a polygon shapefile, can't find any example with google. >> > What do you really want to save here? > A basemap with a contour surface overlayed can be viewed as a assembly > of various layers. So this is like the result of the gis operations when > you launch the map composer to finish your map. > > If you want to create a raster file from the contour part plotted over a > basemap I think the python bindings of gdal will get you started. > http://pypi.python.org/pypi/GDAL/ > I succeded into writing a tiff file from a gdal array. > > I don't know how to write a vector file from python with ogr or shapely. > But these questions are better to be asked on the gdal list.: > > So about interpolating to a contour look at shapely. Writing should be > accomplished with ogr. > > That said, I only have testing "experience" with writing geodata with > python. > > The overkill may be to invoke the respective GRASS command by a script. > > I would appreciate if you would tell us what you use by the end. > > Kind regards, > Timmie > > > When it comes to python and GIS the first stop seems to be: > > * http://gispython.org/ > * http://lists.gispython.org/mailman/listinfo/community > > Some more links: > * http://de.giswiki.net/wiki/Kategorie:Python > * http://de.giswiki.net/wiki/WorldMill > * http://zcologia.com/news/750/keytree/ > * http://sgillies.net/ > > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's challenge > Build the coolest Linux based applications with Moblin SDK & win great prizes > Grand prize is a trip for two to an Open Source event anywhere in the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > Matplotlib-users mailing list > Matplotlib-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-users > > > -- Lionel Roubeyrie - [EMAIL PROTECTED] Chargé d'études et de maintenance LIMAIR - la Surveillance de l'Air en Limousin http://www.limair.asso.fr ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
