[mapserver-users] QGIS vs Mapserver someone use wrong scale ?

[Martin Kofahl]

Hi Andrea,
the inaccuracy may rest upon the resolution defined in your mapfile. By
default, MapServer uses RESOLUTION 72, I think. This is not quite correct
for OGC WMS, because this standard assumes a pixelsize of 0.28 x 0.28 mm²
which is ~90.7 dpi. Not sure if you can set floating point resolutions in
MapServer. Try setting RESOLUTION 90.7 or 91 in your mapfile.

Best regards,
Martin


2013/2/11 Andrea Peri <aperi2007 at gmail.com>

> Hi,
>
> I set a class rule to show the label in this interval scale:
>
>       LABEL
>         COLOR 175 109 134
>         OUTLINECOLOR 255 255 255
>         OUTLINEWIDTH 1
>         MAXSCALEDENOM 300100
>         MINSCALEDENOM 1
>         ....
>
> After I try to test it with QGIS, but I see calling it with qgis the
> show of labels in the scale are not so linear as I could guess.
>
> infact
>
> the label ARE NOT SHOWED at 1:299.990
> the label ARE NOT SHOWED at 1:300.000
> the label are showed at 1:300.001
> the label are showed at 1:300.010
> the label ARE NOT SHOWED at 1:300.050
> the label are showed at 1:300.090
> the label ARE NOT SHOWED at 1:300.100
> the label ARE NOT SHOWED at 1:300.110
> the label ARE NOT SHOWED at 1:300.150
>
> So seem the limit of
> 1:300.100 I set in the mapfile is not so exactly used.
>
> But I'm not able to understand if is a wrong QGIS calculation of scale
> value or is a MapServer trouble.
>
> Any hint is welcome
>
> --
> -----------------
> Andrea Peri
> . . . . . . . . .
> qwerty àèìòù
> -----------------
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