On Thu, Feb 25, 2021 at 4:22 PM Ian Turton <[email protected]> wrote:

>
> What I expected GeoServer to do was extract the required data from Layer A
> and a Layer B draw it as a single image and return it to QGIS with nothing
> in between the two layers.
>

Maybe QGIS is only asking for the bbox declared in the capabilities? I can
assure you GeoServer is completely ignoring the bbox declared in the layers,
it's informative, not mandatory. Try yourself in a layer preview (I did,
reported outcomes in the previous mail in this thread).

If it's QGIS, it would explain why you get the expected BBOX when they are
separate, but the whole thing once they are unioned (QGIS is asking for
the bbox of the whole layer).

In general, I strongly recommend running tests without an external client,
as they normally come with the client specific behavior mixed in,
you want to see what GeoServer does in face of a straight GetMap request
(the openlayers preview in GeoServer is very close to bare bones, I
normally use that).

Cheers
Andrea


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