[MapServer-dev] MVT and WMS STYLES and FILTERS

[Seth G]

Hi Jukka,

It would work in exactly the same way as a WMS request. So filtering would only be done if a LAYER has been created with multiple GROUPs for styles, and features are filtered in a group out as part of CLASS expressions. For example if there is a GROUP "primary_roads" that only displays primary roads then adding &STYLE=primary_roads to a request would only return primary roads in the MVT request. This would match the content of the WMS request. The client would still be free to use an empty default style using &STYLE=

It would be nice if the MapServer tile mode also allowed MVT as an output format https://mapserver.org/output/tile_mode.html - this matches more the way GeoServer works, rather than using the WMS interface. 

Seth

--
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On Thu, Jan 18, 2024, at 8:42 PM, Rahkonen Jukka wrote:
> Hi,
>
> Will there be any way to prevent filtering if someone wants to cache 
> the MVT tiles with MapCache, for example? Should the admin write an 
> unfiltered STYLE for that purpose? Geoserver seems to consider that one 
> tile for all the styles is an advantage 
> https://docs.geoserver.org/main/en/user/extensions/vectortiles/tutorial.html 
> but I have not tested how Geoserver really behaves.
> Is the aim of filtering to minimize the size of the vector tiles?
>
> -Jukka Rahkonen-
>
> -----Alkuperäinen viesti-----
> Lähettäjä: MapServer-dev <mapserver-dev-bounces at lists.osgeo.org> 
> Puolesta Even Rouault via MapServer-dev
> Lähetetty: torstai 18. tammikuuta 2024 14.21
> Vastaanottaja: Seth G <sethg at geographika.co.uk>; MapServer Devs 
> <mapserver-dev at lists.osgeo.org>
> Aihe: Re: [MapServer-dev] MVT and WMS STYLES and FILTERS
>
> Hi,
>
> It seems reasonable to me that STYLE and FILTER are taken into account 
> by the MVT output to WMS (principle of least surprise). MVT is just an 
> alternate output format (the fact that you can style it on client side 
> is orthogonal IMHO)
>
> Even