Peter,
I have found that if the map size (width and height in pixels) aspect
ratio does not exactly match the map extents (map units) aspect ratio
the map extents are adjusted.
I'm working with MapScript and to get exact scale pdf map I have to set
map size first and then extent and then scale to get good results.
I hope this helps.
*Worth Lutz*
------------------
On 07/24/2014 06:49 AM, Peter Hopfgartner wrote:
I'm generating dynamically Map Object, with with a certain extent, in
the concrete example
629396.05065523,4984079.9894638,655192.92565523,5019084.3644638
In generated Map object uses the WMS client functionality to call WMS
services. Anyway, the BBOX get's slightly changed, so that the
original scale of 1:100000 gets changed to approx 1:100103, since it
calls the WMS services with
629382.807906257,4984062.02007212,655206.168404203,5019102.33385548
as can be taken from the web server log files:
mmm.mmm.mmm.mmm - - [24/Jul/2014:12:25:58 +0200] "GET
/author/services/ows.php?PROJECT=ancitel&MAP=catasto_reti&LANG=xw&OGSTAT=ot3cp0i7qmph4guuof75702m70&RESOLUTION=96&LAYERS=dtm,uso_lombardia,strade_lombardia,g_limiti_amministrativi,g_label,g_0707,g_0704&REQUEST=GetMap&SERVICE=WMS&FORMAT=image/png%3B+mode%3D8bit&STYLES=,,,,,,&HEIGHT=1323&VERSION=1.1.1&SRS=EPSG:32632&WIDTH=975&BBOX=629382.807906257,4984062.02007212,655206.168404203,5019102.33385548&TRANSPARENT=TRUE&EXCEPTIONS=application/vnd.ogc.se_inimage
HTTP/1.1" 200 678803 "-" "MapServer/6.4.1 libcurl/7.19.7"
This change in scale is beyound te axpected tolerance in this
particular use case, where technical data must be plotted in a PDF file.
Any help is appreciated. Obvioulsly, I can fetch the WMS services in
my code and overlay them "by hand". Anyway, for a couple of reasons
this was the preferred approach.
Regards,
Peter
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