[Community] Default map renderer behavior, extents and pixel aspect ratio
cbc at unc.edu
Wed Mar 1 18:31:25 EET 2006
Sean Gillies wrote:
> Allowing non-square (spatial aspect ratio) pixels preserves the output
> extent, and I prefer this behavior. How do the rest of you feel?
It ought to be selectable behavior.
Disrespecting the aspect ratio in favor of image size destroys the
apparent projection while preserving the extents.
Disrespecting image size in favor of aspect ratio destoys extents in
favor of apparent projection.
People ought to be able to specify which they favor: extents or image
size to get the results they desire.
Being able to specify image size and extents sets up a potential
conflict between resolving aspect ratio and apparent projection. It's
probably a bad thing that both can be specified. But they can. So
provide intelligent choices about how to deal with the potential conflict.
In the absence of being able to specify which, MapServer takes the
scientifically correct approach, although maybe not the most visually
expected approach, of rendering projection faithfully.
Thanks for asking.
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