[Qgis-user] downloading a wms geoservice from QGis

[Juliana Mori]

sorry, I hit enter before finishing the email... Again:

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). So, if I understood right, I need to specify a
resolution in decimal degrees, right?

I´m saving a raster image with only 3 color values (assigned by its column
"dn" which indicates if the pixels correspond to forest, no forest or no
information). Sorry, I don´t know to say if it´s orthoimage.
I´ve already polygonized the other tiff files I had from this series (but
were not from WMS) and the results were meaningful, probably because
there´re only this 3 colors.



2016-11-07 19:18 GMT-02:00 Juliana Mori <julmori at gmail.com>:

> 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 downloading and uploading and then end up with an outdated image.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
>>>
>>>
>>>
>>> _______________________________________________
>>> Qgis-user mailing listQgis-user at lists.osgeo.org
>>> List info: http://lists.osgeo.org/mailman/listinfo/qgis-user
>>> Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user
>>>
>>> _______________________________________________ Qgis-user mailing list
>>> Qgis-user at lists.osgeo.org List info: http://lists.osgeo.org/mailman
>>> /listinfo/qgis-user Unsubscribe: http://lists.osgeo.org/mailman
>>> /listinfo/qgis-user
>>
>> --
>> *Juliana Mori*
>> www.julianamori.com
>> +55 11 999653145
>>
>>
>
>
> --
> *Juliana Mori*
> www.julianamori.com
> +55 11 999653145
>
>


-- 
*Juliana Mori*
www.julianamori.com
+55 11 999653145
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20161107/89f7f3bd/attachment.html>