[Qgis-user] downloading a wms geoservice from QGis

[Juliana Mori]

Hi Andreas,

for sure it would be much better to use the webservice directly but I´m
already investigating with CARTO and it seems there´s no WMS support - if I
have any update on this, I´ll share with you.

EPSG:4326 would be perfect for me, even though I know the original file is
in Magna Sirgas (EPSG:4686).



2016-11-07 19:15 GMT-02:00 Andreas Neumann <a.neumann at carto.net>:

> 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 downloading and uploading and then end up with an outdated image.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>:
>
>> 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
>>
>>
>>
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>
> --
> *Juliana Mori*
> www.julianamori.com
> +55 11 999653145
>
>


-- 
*Juliana Mori*
www.julianamori.com
+55 11 999653145
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