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 <[email protected]
<mailto:[email protected]>>:
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 <[email protected]
<mailto:[email protected]>>:
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with an outdated image.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
<[email protected] <mailto:[email protected]>>:
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
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