then I tried
mapserv?map=mapfile.map
&layers=ALL
&mode=MAP
&mapxy=12+45
&buffer=30
&mapsize=500+500
&SCALEDENOM=45000
The mapserver just calculated out an extreme large extent and the region
where I am interested in is rendered as small as just one point. (larger
SCALEDENOM -> larger extent)
According to http://mapserver.org/cgi/controls.html the mapsize or imgsize
should only affect the pixel size of output image. The "buffer" should work
with mapxy for limiting map extent. But changing the "buffer" in above
example did not affect the map extent.
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