[MAPSERVER-USERS] Problems calculating MAXSCALES

[Stephen Woodbridge]

Steve,

I have not checked this recently, but I think there is a fundamental 
principal that if I request a map at SCALE=20000 and some X,Y that the 
map rendered includes all LAYERs that are in the 20000 SCALE +- 1.0 for 
rounding. This was the bug that I reported in
    http://trac.osgeo.org/mapserver/ticket/2166
and I hope that that has not regressed. Was this bug fixed after 5.0.2 
that Rob is working with.

Rob,

Have you tried a later build of mapserver like 5.2 and see if the 
problem exists there?

Best regards,
   -Stephen Woodbridge
    http://imaptools.com/

Steve Lime wrote:
> It's likely the desktop product you're using uses a different pixel
> model than MapServer's center-to-center model. The code in 4.8.3 was
> incorrect so I'm not sure what we can do. A WMS extent simply isn't
> equal to a MapServer extent. The MapServer WMS and WCS code account
> for the difference between the MapServer and OGC models by
> transforming between models (shrink or expand by .5 pixels).
> 
> My opinion is that you adjust the reference scales in your mapfile
> based on the now correct output from 5.0.2.
> 
> Steve
> 
> 
>>>> On 8/13/2008 at 9:07 AM, in message
> <f3b73b7d0808130707r2df2aeeg826ed5f07dbc033a at mail.gmail.com>, "Tamas
> Szekeres" <szekerest at gmail.com> wrote:
>> 2008/8/13 Rob <gis at vanbooth.com>:
>>> If I change the (width-1) to be width, then I get scale figures
>>> that correspond to what I would expect, and what the ESRI GIS
>>> Clients hitting my WMS service seems to think that the scale
>>> should be.  From the dates in TRAC it certainly looks like this
>>> was changed between 4.8.3 and 5.0.2.
>>> 
>> I'd prefer back out r6529 and go with a double based calculation 
>> instead of it. However I'm not sure how this will affect the
>> original problem, so you should reopen this bug by pointing out the
>> problems with the current scale calculation you encountered.
>> 
>> Best regards,
>> 
>> Tamas _______________________________________________ 
>> mapserver-users mailing list mapserver-users at lists.osgeo.org 
>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
> 
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