[mapserver-users] Data for a layer based on zoom level

[thomas bonfort]

Jesper,
I don't think there would be a reason for two layers group'd together
to not receive the TIME substitution. If that is the case it is a bug
that should be reported. As for your question, the 6.4 release got a
SCALETOKEN enhancement that should do jus what you need:
http://mapserver.org/development/rfc/ms-rfc-86.html

--
thomas

On 4 October 2013 09:11, Jesper Kempe <jesper.kempe at gmail.com> wrote:
> Hi
>
> We have bunch of data for different times loaded into a PostGIS-database.
> This data has an id that we match to a another table containing the
> geometries with a join. To get the correct data for given timestep a %TIME%
> parameter from the WMS-query is used in the where clause.
>
> CONNECTIONTYPE postgis
> DATA "the_geom from (select gid, stationname, the_geom, cout from
> highres_shapes join seadata on stationname=seaareaid where
> reftime='2013-10-03T07:59:00Z' and validtime = '%TIME%') as subquery using
> SRID=3006 using unique gid"
>
>
> The problem now is performance. The geometries used are very detailed so on
> high zoom levels it takes a bit too long to plot all the polygons. Zoomed in
> where fewer polygon are in view it takes no time to plot the image.
>
> I have created a simplified version of the geometries that is quite a lot
> faster to draw. But this polygon can only be used on the highest levels. If
> you zoom in further we need to use higher resolution.
>
> I have tried to create two layers with the same GROUP and different
> MINSCALEDENOM and MACSCALEDENOM. That works but then I cant get the supplied
> TIME-parameter in the url to be used in the db-query.
>
> The question for you guys now if there is another way I can switch between
> the two versions (ie database tables) of the geometries based on zoom level?
>
>
> Jesper
>
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