[mapserver-users] Doubling of labels on high resolution maps

[Jan Hartmann]

No, neither maxsize nor partials works. I guess that's just the way QGIS 
requests large WMS-images.

There is a "tile_metatile_level" configuration directive that should 
solve this problem:

https://mapserver.org/output/tile_mode.html

but it does not seem to work for WMS layers.

So I used the underlying PostGIS layer in QGIS, and that works OK, of 
course. Not sure if this is a bug in MapServer, though.

Thanks for your help,

Jan

On 10/16/2019 5:55 PM, Rahkonen Jukka (MML) wrote:
>
> Hi,
>
> Print composer is probably making tiled requests from WMS. That is 
> compulsory for any bigger maps because the default maxsize on the 
> Mapserver side is 2048x2048 pixels 
> https://mapserver.org/uk/mapfile/map.html. It is easy to increase the 
> maxsize but I do not know if print composer as a client can be aware 
> of that.
>
> Partials FALSE may help, but based on the screenshot it is possible 
> that print composer is making requests with some overlap.
>
> -Jukka Rahkonen-
>
> *Lähettäjä:*mapserver-users <mapserver-users-bounces at lists.osgeo.org> 
> *Puolesta *Travis Kirstine
> *Lähetetty:* keskiviikko 16. lokakuuta 2019 18.24
> *Vastaanottaja:* Jan Hartmann <j.l.h.hartmann at uva.nl>
> *Kopio:* MapServer-users <mapserver-users at lists.osgeo.org>
> *Aihe:* Re: [mapserver-users] Doubling of labels on high resolution maps
>
> There are a few options you could add to your label but I would start with
>
> MINDISTANCE 200
>
> PARTIALS FALSE
>
> See
>
> https://mapserver.org/mapfile/label.html
>
> On Wed, 16 Oct 2019 at 10:37, Jan Hartmann <j.l.h.hartmann at uva.nl 
> <mailto:j.l.h.hartmann at uva.nl>> wrote:
>
>     Hi,
>
>     I'm trying to generate high resolution print maps with QGIS, based
>     on a MapServer WMS layer. When displayed in the regular QGIS
>     application with 72dpi, all looks fine. When using the Print
>     Composer based on the same Mapfile, but with 300dpi, some labels
>     are duplicated (not all). Some duplicates are clipped. The two
>     versions can be seen here:
>
>     https://maps.hisgis.nl/marken_072dpi.png
>     https://maps.hisgis.nl/marken_300dpi.png
>
>     Below the Mapfile.  Any idea what goes wrong here?
>
>     Jan
>
>     map
>     name Markegrenzen
>
>     web
>       metadata
>         "wms_title" "Markegrenzen"
>         "wms_srs" "EPSG:28992 EPSG:3857"
>         "wms_extent"  "13000 301000 279000 620000"
>         "wms_enable_request" "*"
>       end
>     end
>
>     extent 13000 301000 279000 620000
>     units meters
>     size 400 400
>     resolution 300
>     defresolution 72
>
>
>     projection
>       "init=epsg:28992"
>     end
>
>     z
>     layer
>       name Markegrenzen
>       status on
>       type polygon
>       connectiontype postgis
>       connection "dbname=ov options='-c search_path=horigheid,public'"
>       data " the_geom from (
>             select gid,the_geom,naam from markegrenzen
>         ) as foo using unique gid using srid=28992
>       "
>       labelitem "naam"
>       class
>         style
>             outlinecolor 255 0 0
>             width 1
>         end
>         label
>             color 255 0 0
>             size 4
>         end
>       end
>     end
>     end
>
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