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<font face="Times New Roman">Not sure if the ticket is just for the
documentation or also for the program option. I would like to have
the option for native MapServer too: I find it easier to use for
map layout than WMS SLD.</font> I always considered the MapServer
parser the best thing of MapServer.<br>
<br>
Jan<br>
<br>
On 2011-02-17 16:18, Lime, Steve D (DNR) wrote:
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<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">I’ll create a ticket to do so. When MapServer was
originally written there was a companion program for imagery
(imgserv) that<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">was implemented using the Erdas Imagine C
toolkit. I followed their lead at the time and it’s stuck…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">“Would it make sense to add an option for
MapServer to treat extents the same way as GDAL?” Sure, it’s
called WMS…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">Steve</span><span style="font-size: 11pt;
font-family: "Calibri","sans-serif";
color: rgb(31, 73, 125);"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
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medium medium; border-style: solid none none; border-color:
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<p class="MsoNormal"><b><span style="font-size: 10pt;
font-family:
"Tahoma","sans-serif"; color:
windowtext;">From:</span></b><span style="font-size:
10pt; font-family:
"Tahoma","sans-serif"; color:
windowtext;"> Jan Hartmann
[<a class="moz-txt-link-freetext" href="mailto:j.l.h.hartmann@uva.nl">mailto:j.l.h.hartmann@uva.nl</a>] <br>
<b>Sent:</b> Thursday, February 17, 2011 9:18 AM<br>
<b>To:</b> Lime, Steve D (DNR)<br>
<b>Cc:</b> Mohamed Saâd HESSANE;
<a class="moz-txt-link-abbreviated" href="mailto:mapserver-dev@lists.osgeo.org">mapserver-dev@lists.osgeo.org</a><br>
<b>Subject:</b> Re: [mapserver-dev] Implementation of
the msCalculateScale<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Interesting. Could this be added to the
documentation? It's important when you are scaling at pixel
level. Would it make sense to add an option for MapServer to
treat extents the same way as GDAL?<br>
<br>
Jan<br>
<br>
On 2011-02-17 16:07, Lime, Steve D (DNR) wrote: <o:p></o:p></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif";">It’s due to how
MapServer interprets extents. It uses a pixel-center model
so you end up using width or height minus one in
computations because</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif";">an extent is
from the center of the UL pixel to the center of LR pixel
(you lose the “one” from the outside) . I’ve attached a
graphic I created some time</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif";">ago that
illustrates the difference between a MapServer extent and
the model GDAL and WMS use.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif";"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif";">Steve</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif";"> </span><o:p></o:p></p>
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medium; border-style: solid none none; padding: 3pt 0in 0in;
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<p class="MsoNormal"><b><span style="font-size: 10pt;
font-family: "Tahoma","sans-serif";">From:</span></b><span
style="font-size: 10pt; font-family:
"Tahoma","sans-serif";"> <a
moz-do-not-send="true"
href="mailto:mapserver-dev-bounces@lists.osgeo.org">mapserver-dev-bounces@lists.osgeo.org</a>
[<a moz-do-not-send="true"
href="mailto:mapserver-dev-bounces@lists.osgeo.org">mailto:mapserver-dev-bounces@lists.osgeo.org</a>]
<b>On Behalf Of </b>Mohamed Saâd HESSANE<br>
<b>Sent:</b> Thursday, February 17, 2011 4:41 AM<br>
<b>To:</b> <a moz-do-not-send="true"
href="mailto:mapserver-dev@lists.osgeo.org">mapserver-dev@lists.osgeo.org</a><br>
<b>Subject:</b> [mapserver-dev] Implementation of the
msCalculateScale</span><o:p></o:p></p>
</div>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Good morning everybody.<br>
I don't understand how the msCalculateScale function in
mapscale.c is implemented.<br>
As far as I know, the scale is calculated from the relation :
inches_in_screen / inches_in_reallity.<br>
inches_in_screen : depend on the DPI and the width of the map;<br>
inches_in_reality : depend on the map.extent, and the pixel
size.<br>
So why the "width-1" at the line 96? For me just "width" is
more correct. Perhaps I'm wrong.<br>
The branches 4.X have just "width" in their implementations
(line 125).<br>
So why the center pixel is removed from calculation?<o:p></o:p></p>
<pre><o:p> </o:p></pre>
<pre><o:p> </o:p></pre>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>mapserver-dev mailing list<o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="mailto:mapserver-dev@lists.osgeo.org">mapserver-dev@lists.osgeo.org</a><o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="http://lists.osgeo.org/mailman/listinfo/mapserver-dev">http://lists.osgeo.org/mailman/listinfo/mapserver-dev</a><o:p></o:p></pre>
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