[OpenLayers-Users] How do we use
MaxScaleDenominator andMinScaleDenominator
Tim Schaub
noreply at geocartic.com
Fri Jan 5 13:09:46 EST 2007
> note in some projections a pixel near the top of the screen
> will be completely different than near the bottom ie. we are
> always just approximating to provide users clues about
> relative sizes of things that are warped by being made 2d.
Yes, of course - sort of. A pixel "will be completely different" in terms
of its representation on the surface of the earth. Though resolution (map
units per pixel) is a constant since we're dealing with square pixels. I
think you are referring to the ratio between a map distances and ground
distances (scale) - which can never be constant across any area on a flat
map. Our planar pixel space, however, is projected space - on this plane
there is a constant relationship between pixel units and map units.
Tim
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