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.
Thanks
···
--
Lionel Roubeyrie - lroubeyrie@...1068...
Chargé d'études et de maintenance
LIMAIR - la Surveillance de l'Air en Limousin
http://www.limair.asso.fr
Lionel Roubeyrie wrote:
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.
Thanks
Lionel: I've never done that, and don't know anyone who has. Would be a valuable contribution though.
-Jeff
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.
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:
* Kategorie:Python – GISWiki
* WorldMill – GISWiki
* http://zcologia.com/news/750/keytree/
* http://sgillies.net/
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.
GDAL · PyPI
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:
* Kategorie:Python – GISWiki
* WorldMill – GISWiki
* http://zcologia.com/news/750/keytree/
* http://sgillies.net/
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Lionel Roubeyrie - lroubeyrie@...1068...
Chargé d'études et de maintenance
LIMAIR - la Surveillance de l'Air en Limousin
http://www.limair.asso.fr