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

[Thekla Wirkus]

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
>>> _______________________________________________
>>> mapserver-users mailing list
>>> mapserver-users at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>> _______________________________________________
>> mapserver-users mailing list
>> mapserver-users at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>

-- 


---------------------------------

Thekla Wirkus
GIS-Consultant

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