[mapserver-users] Specify resolution (or pixel size) in WMS requests

[thomas bonfort]

Thekla,
can you open a ticket for this one please ? I'll try to have a look at
it before the 6.2 release, but can't promise anything...

thanks,
thomas

On Mon, Jul 16, 2012 at 12:13 PM, Thekla Wirkus
<thekla.wirkus at wheregroup.com> wrote:
>
> Hello,
>
> last december 2011 Astrid wrote a mail about the behaviour of RESOLUTION and
> DEFRESOLUTION. We tested again with MapServer
> 6.2 and here are the results. The size of the symbols, texts and lines was
> not like we expected. They were often too small.
>
> Have a look at the mail from 14. december 2011
> http://lists.osgeo.org/pipermail/mapserver-users/2011-December/071077.html
>
>
> We tested with MAP.RESOLUTION=288&MAP.DEFRESOLUTION=72, SIZEUNINTS Meters,
> the scaled layers with SYMBOLSCALEDENOM 10000.
> http://localhost/cgi-bin/mapserv62b1?map=/data/umn/resolution/map/resolution_test.map&MAP.RESOLUTION=288&MAP.DEFRESOLUTION=72"&VERSION=1.1.1&REQUEST=GetMap&SERVICE=WMS&LAYERS=notscaledPoint,scaledPoint,notscaledLine,scaledLine,notscaledPolygon,scaledPolygon,Polygon_with_symbols,notscaledLabel,scaledLabel&STYLES=,,,,,,,,&SRS=EPSG:31466&BBOX=2517600,5672315,2518960,5673675&WIDTH=2000&HEIGHT=2000&FORMAT=image/png&BGCOLOR=0xffffff&TRANSPARENT=TRUE&EXCEPTIONS=application/vnd.ogc.se_xml
>
>
> The behaviour of MapServer 6.0 and MapServer 6.2 is just the same. This time
> we have a demo project where we tried the different cases. You can download
> it at:
>
> UMN:
>
> https://svn.wheregroup.com/download/mapserver_resolution.zip
>
> PDF:
> https://svn.wheregroup.com/download/mapserver_resolution_pdf.zip
>
>
>
> Results:
>
> POINTS
>     * scaled or not scaled Points/Symbols: displayed correct, scaled and
> notscaled are the same in the map
>
> LINES
>     * scaled lines: displayed correct
>     * unscaled lines: too small (1:2000, 1:5000, 1:1000), correct (1:20000)
>
> POLYGON
>     * scaled Polygone/Outline: displayed correct
>     * not scaled Polygone/Outline: too small (1:2000), correct (1:5000,
> 1:10000,1:20000)
>     * scaled or not scaled Polygone with symbols: displayed correct
>
> LABEL
>     * scaled Label: too small
>     * not scaled Label: too big (1:1000, 1:2000, 1:5000, too small (1:20000)
>
>
> For us it would be good to get this problem solved, as at the moment we
> generate a copy of the mapfile for the print with symbol- and labelsize
> multiplyed with factor 4. It would be charming to solve the print with one
> mapfile. We could do testing and maybe I could look for sponsoring too.
>
>
>
> Is there someone else interested to solve this? Is there a ticket already?
>
> Thekla
>
>
>
>
> On 14.12.2011 17:44, Astrid Emde wrote:
>
> Hello,
>
> we tried the parameter MAP.RESOLUTION AND MAP.DEFRESOLUTION with
> MapServer 6.0.1 and made the following observations.
>
> We tested with RESOLUTION=288&MAP.DEFRESOLUTION=72
>
> The size of the symbols and textes was not like we expected. They were
> often too small.
>
> We tested with and without the parameter SYMBOLSCALEDENOM
>
> 1.) without SYMBOLSCALEDENOM (none scaled, fix size) ok are:
>
>     * lines (not scaled) are dispayed correct (ok)
>     * outlines (not scaled) of polygones are dispayed correct (ok).
>     * symbols (not scaled) are displayed correct (ok).
>     * textes (not scaled) are displayed correct (ok).We tested not scaled
> texts without SYMBOLSCALEDENOM: It's displayed different weather
> MINSIZE/MAXSIZE is existing or not.
>
>
> 2.) with SYMBOLSCALEDENOM
>
> NOT ok:
>
>     * Scaled symbols are displayed incorrect - too small.
>     * Scaled lines are dispayed incorrect - too small.
>     * scaled outlines of polygones are dispayed incorrect.
>     * Scaled text are dispayed incorrect - too small.
>
> For us it would be good to get this problem solved, as at the moment we
> generate a copy of the mapfile for the print with symbol- and labelsize
> multiplyed with factor 4. It would be charming to solve the print with one
> mapfile. We could do testing and maybe I could look for sponsoring too.
>
> Is there someone else interested to solve this? Is there a ticket already?
>
> Astrid
>
> thomas bonfort schrieb:
>
> cgi controls should do the trick?
>
> http://....../?SERVICE=WMS&....&MAP.RESOLUTION=144&MAP.DEFRESOLUTION=96
>
> --
> thomas
>
> On Mon, Dec 5, 2011 at 17:43, Peter Hopfgartner
> <peter.hopfgartner at r3-gis.com> wrote:
>
> Basically, I am looking for a way to something analogous to
>
> DEFRESOLUTION in
>
> a WMS request. The standard says, that a pixel is 0.28 mm x 0.28 mm
> (25.4/0.28 ~= 90.71 DPI). I could not found a way to change this in the
>
> WMS
>
> 1.3.0 standard.
> Is there a MapServer vendor parameter, similar to the one in GeoServer,
> http://docs.geoserver.org/latest/en/user/services/wms/vendor.html#format-options
> ?
>
> Peter
>
> --
> Peter Hopfgartner R3 GIS http://www.r3-gis.com
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> --
>
>
> ---------------------------------
>
> Thekla Wirkus
> GIS-Consultant
>
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