[gdal-dev] Trying to get a WMS image with GDAL

[Jukka Rahkonen]

Adri CS <acsantome <at> gmail.com> writes:

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> Hello everybody,
> I'm basically a noob with GDAL and I'm tasked to get a WMS using GDAL.
> The only experience I have  with GDAL is opening a raster and getting the
metainfo from it. I did it following the GDAL API Tutorial.
> Okay, for the WMS, I'm reading http://www.gdal.org/frmt_wms.html but I'm
having a really difficult time to start in C++.
> 
> Is there a tutorial like the GDAL API Tutorial where I can start from? Or
the process of fetching the WMS is the same as for a raster?

Hi,

You are reading the right document. Take the onearth_global_mosaic example
and modify the xml file to use server
http://vmap0.tiles.osgeo.org/wms/vmap0 and layer "basic" 
and then you will soon get an image like this 

http://vmap0.tiles.osgeo.org/wms/vmap0?REQUEST=GetMap&SERVICE=WMS&VERSION=1.1.1&WIDTH=459&HEIGHT=351&LAYERS=basic&TRANSPARENT=TRUE&FORMAT=image%2Fjpeg&BBOX=-180.0,-137.64705882352942,180.0,137.64705882352942&SRS=EPSG:4326&STYLES=
with gdal_translate as in the example.

By the way, OSGeo is running a misconfigured ancient MapServer 5.6.5 with a
wrong OnlineResource as can be seen 

http://vmap0.tiles.osgeo.org/wms/vmap0?REQUEST=GetCapabilities&SERVICE=WMS&VERSION=1.3.0

Using the advertised URL gives an error msLoadMap(): Unable to access file.
(/var/www/tiles/vmap0/.map)

-Jukka Rahkonen-