Hi,
With Mapserver it has been possible not to name the rootlayer by using a workaround of using an empty name for the MAP. Rootlayer will then have only a title but no name. Nowadays it is configurable in an easier way https://github.com/mapserver/mapserver/issues/5404.
Myself I have never used named rootlayer in our services and we haven’t received any complaints from our users because of that.
-Jukka Rahkonen-
Lähettäjä: Jody Garnett <jody.garnett@…403…>
Lähetetty: keskiviikko 29. toukokuuta 2019 12.36
Vastaanottaja: Jonathan Moules <jonathan-lists@…4460…>
Kopio: GeoServer geoserver-devel@lists.sourceforge.net
Aihe: Re: [Geoserver-devel] Optional flag to remove root Layer in WMS Capabilities documents
···
That is really neat! Thanks for the background, when do we get a foss4g presentation on your database?
Based on the research do we want to have the option remove root in all cases?
root → groups → layers
group → layers
layer
I assume you are filling what was formally the root SRS list in the “top-level” layer definition in each case?
–
Jody Garnett
On Tue, 28 May 2019 at 17:08, Jonathan Moules <jonathan-lists@…4460…> wrote:
I believe most WMS clients can already handle no-root-layers, at least if they interact successfully with ArcGIS Server WMS’, which don’t always provide one. For instance try the getcap for:
https://www.geoseer.net/rl.php?ql=1c9ad6b795c81a3a
or
https://www.geoseer.net/rl.php?ql=20e92da97bb6ff7b
This seems to only be true of the /ImageServer/ endpoints. ArcGIS /MapServer/ endpoints have a root layer.
Thredds, QGIS Server and MapServer also have a root layer.
{Jody} … it is just very unusual to see a WMS service configured this way (with a single layer).
From a purely statistical perspective, most WMS services only have have a single layer. Of 116,762 public WMS services in my database, 62,442 have exactly one (1) named layer. Just 54,320 have > 1 layer. That’s across all types of WMS Server.
Note that I only keep “named layers” (layers that have a “name” set and can thus be requested via GetMap), and I don’t keep nested-layers relationships.
Cheers,
Jonathan
On 2019-05-21 08:32, Andrea Aime wrote:
On Tue, May 21, 2019 at 9:27 AM Mauro Bartolomeoli <mauro.bartolomeoli@…1268…> wrote:
Hi Jody. The most interesting use case is when you are asking for a layer group and you get the group as root and the subgroups and layers as child nodes (so not really a single layer, but a tree with a single root, that is not the GS default root, but the group itself).
I would not make it active by default, because I suspect many GeoServer aware WMS clients could stop working.
Yeah, I agree with the idea in general, but best to have it off by default, don’t think I’ve seen a WMS with a single root layer so far. The layer group case should work instead, after all, it’s still a tree, but even in that case, some clients
would break on upgrade if we move from root->group->layers to just group->layers
Cheers
Andrea
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