Thank you for your reply,

I’m sorry I didn’t my make question clear. In which cases a GeoServer (2.13.0) 
WCS service can produce a GML output?

We have tried this with several coverages. But when the outputFormat parameter 
is defined as “application/gml+xml”, GeoServer responses always with an error 
“format application/gml+xml is not supported for this coverage”.

We would like to use the feature in debugging and checking purposes.

--
Ismo Lahtinen
Finnish Environment Institute (SYKE)

Lähettäjä: Andrea Aime [mailto:[email protected]]
Lähetetty: 15. helmikuuta 2019 15:32
Vastaanottaja: Lahtinen Ismo
Kopio: [email protected]
Aihe: Re: [Geoserver-users] WCS and GML

On Wed, Feb 13, 2019 at 4:05 PM Lahtinen Ismo 
<[email protected]<mailto:[email protected]>> wrote:
Hello!

The WCS capabilities response in GeoServer version 2.13.0 includes 
"application/gml+xml" as a supported output format. However,  GML is not listed 
as an output format in the documentation 
(https://docs.geoserver.org/2.13.0/user/services/wcs/outputformats.html).

True indeed. Pull requests to fix the documentation welcomed, see quickfix 
approach:
https://docs.geoserver.org/latest/en/docguide/quickfix.html


Also, it seems that when creating a new WCS layer GML is not listed as an 
available format.

Those lists only control the generation of WCS 1.0 capabilities, they have no 
other effect as far as I remember.
Quite likely, the GUI controls are not using the plugin system to get a list of 
the available formats... patches welcomed, if anyone still cares about WCS 1.0!

In which cases GML can be chosen as an output format of a WCS layer?

I'm going to venture and say, almost never? The format is text based and 
extracting anything but the
smallest set of pixels would result in a very large output.
I can think of two legit use cases (everybody feel free to add more):

  *   debugging purposes, since one can read the values of the pixels in clear 
text, along with bounds and the like
  *   "bbox based raster GetFeatureInfo", getting all values in a given bbox 
for a tabular display in a client
Cheers
Andrea

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