[Qgis-user] downloading a wms geoservice from QGis

[Andreas Neumann]

Hi Juliana,

First, I would investigate with Carto, if you really cannot embed a WMS. 
It would be much better to use the webservice directly rather than 
downloading and uploading and then end up with an outdated image.

If that does not work, you need to set a meaningful resolution. As we 
can see in your screenshot the resolution text input fields are empty. 
Also check if the projection is correct. Do you really want to save in 
EPSG:4326 or rather in a meter based system?

What kind of data are you saving? Orthoimages or maps with few colors or 
black and white? If it is orthoimages, I would use JPEG compression in 
the Geotiff, otherwise probably deflate/LZW.

Then you have to find a meaningful resolution. If you really want to 
save in EPSG:4326, you have to specify a resolution in decimal degrees. 
Try with larger values first, such as 0.05 and then, if it is too coarse 
go to smaller values.

About polygonizing raster to vector: this really depends on the content 
- and I kind of doubt it if you really get meaningful results. Maybe it 
works with few colors and homogeneous areas. It certainly would not work 
well for aerial images.

Hope it helps,
Andreas

Am 07.11.2016 um 22:05 schrieb Juliana Mori:
> Hi Andreas,
>
> thanks for your reply.
>
> I chose layer extent for extensions and current layer for resolution 
> but still doesn´t work.
>
>
>
> Should I do this in a different way?
>
> About the bigger question, no, CARTO doesn´t allow uploading geotiffs. 
> What I´ve done so far is polygonizing the rasters in QGis and 
> uploading the converted shapefile to CARTO. As you said WMS can´t be 
> converted into shape, I´m not sure this is going to work at all... 
> won´t I be able to polygonize a raster downloaded from a WMS server?
>
> All the best, Juliana.
>
>
>
>
>
> 2016-11-07 18:44 GMT-02:00 Andreas Neumann <a.neumann at carto.net 
> <mailto:a.neumann at carto.net>>:
>
>     Hi Juliana,
>
>     "Save AS" as a WMS should work fine - but you need to specify a
>     useful extent and resolution (in map units of your projection).
>     Otherwise it probably fails.
>
>     I just tested it and it works fine.
>
>     The bigger question is: will CARTO allow to upload larger Geotiff
>     files? Did you check that?
>
>     Note that WMS are always raster. You can't convert it into a shp file.
>
>     Andreas
>
>
>     Am 07.11.2016 um 21:27 schrieb Juliana Mori:
>>     Hello,
>>
>>     I have loaded a wms server to QGis, which is a raster format. As
>>     I need to use this in an external aplication (CARTO) which does
>>     not support wms, I´m trying to export the server loaded into QGIS
>>     through "save as" funcionality. But it´s not working.
>>
>>     Do you know how I can export the wms loaded to a file (raster or
>>     shp)?
>>
>>     Thanks a lot, Juliana.
>>
>>
>>     ps:: I´m working with QGis Essen, 2.14.3
>>
>>     -- 
>>     *Juliana Mori*
>>     www.julianamori.com <http://www.julianamori.com>
>>
>>
>>
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