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

[Rahkonen Jukka (MML)]

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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