[mapserver-users] How to use MINSCALEDENOM & MAXSCALEDENOM with dynamic image size?

[John Maurer]

Thanks for the notice, Tamas. That sounds like what I need.
Cheers,
John

Tamas Szekeres wrote:
> John,
>
> I guess it might be the same problem that I've already addressed in
> http://trac.osgeo.org/mapserver/ticket/2738
>
> The related changes have already been applied in the development 
> version (SVN trunk) so you can test it.
>
> Best regards,
>
> Tamas
>
>
> 2008/12/9 John Maurer <maurerj at nsidc.org <mailto:maurerj at nsidc.org>>
>
>     Dear MapServer Users,
>     Defining a minimum and maximum scale denominator for a layer seems
>     problematic to me when the resulting image size can be arbitrarily
>     specified by the end user. For instance, doubling the image size
>     (e.g. 400px to 800px) on the same map will double the scale
>     denominator (e.g. 24,000 to 48,000)--a layer may display at one
>     image size but not the other because of this. A more useful
>     criteria would be to specify the minimum and maximum pixel size
>     for a layer (e.g. 1 km and 5 km), which is independent of the
>     image size. This must be a common problem for MapServer
>     application developers since a WMS call requires an image width
>     and height. Has anyone come up with a workaround for this? Or am I
>     understanding things incorrectly? Thanks for any help!
>     Best Regards,
>
>     -- 
>     John Maurer
>     Web/Database Applications Engineer
>     National Snow and Ice Data Center (NSIDC)
>     University of Colorado at Boulder
>     http://cires.colorado.edu/~maurerj
>     <http://cires.colorado.edu/%7Emaurerj>
>     +1-303-586-1677
>     ------------------------------------
>     "Without geography, you're nowhere!"
>
>
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>

-- 
John Maurer
Web/Database Applications Engineer
National Snow and Ice Data Center (NSIDC)
University of Colorado at Boulder
http://cires.colorado.edu/~maurerj
+1-303-586-1677
------------------------------------
"Without geography, you're nowhere!"