Hi,
I'm using TMS with the VectorTile extension rather than WFS. I believe
this is the recommended method as it simplifies the data for smaller
scales and delivers a much smaller dataset. I've had a quick look, and
it seems that CQL isn't supported by this setup :(
For now, I've found that I'm able to specify min/max resolutions in
OpenLayers, and have split the layer groups into several groups that I
can turn on/off based on the resolution. Eg. housing is a layer group,
roads another etc. This means more requests to the server, but I can
live with that as the TMS is going via GeoWebCache so it's no big strain
on resources.
Thanks for your help though. Hopefully filtering support will come with
time, but the hack I'm using at the moment will do for now at least.
On 24/07/17 11:59, Paul Wittle via Geoserver-users wrote:
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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