Hi,
I believe you can use the CQL filter parameter if you are using a GET HTTP
request but if you have a complex filter you may need to use a POST request and
the OGC filter as a parameter. I assume you need to switch to POST requests as
there is a limit on the length a URL can be and long CQL can make you hit the
limit if you are querying by polygon.
I've actually just been looking into it again last week as I need the filters
for WFS GetFeature requests; I'm assuming that is the service you are using for
your vector tiles.
In terms of constructing the correct filters you should consult the
documentation at http://docs.geoserver.org/latest/en/user/filter/index.html
However I don't know how that works in terms of layergroups where you want an
entire layer to be ignored at a given scale. I don't know if WFS even uses the
concept. I think it just returns the features within the given bbox and without
rendering dimensions I'm not sure a scale dominator would apply. Hopefully
someone else will help you there?
If the request returns a feature ID (FID) then you may be able to filter out
whole layers based on the request size in units i.e. the width and height of
your bbox.
Paul
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