[Qgis-user] downloading a wms geoservice from QGis
Andreas Neumann
a.neumann at carto.net
Mon Nov 7 13:27:08 PST 2016
So - have you tried setting a resolution and extent? The resolution
input fields need to have values. Empty fields don't work. And no - QGIS
can't autodetect it. It does not know the native resolution of WMS services.
Andreas
Am 07.11.2016 um 22:23 schrieb 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
> <mailto: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
> <mailto: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 with an outdated image.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 <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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>> --
>> *Juliana Mori*
>> www.julianamori.com <http://www.julianamori.com>
>> +55 11 999653145 <tel:%2B55%2011%20999653145>
>
> --
> *Juliana Mori*
> www.julianamori.com <http://www.julianamori.com>
> +55 11 999653145 <tel:%2B55%2011%20999653145>
>
> --
> *Juliana Mori*
> www.julianamori.com <http://www.julianamori.com>
> +55 11 999653145
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