The issue with latitudes greater than 85.05 is the error inflicted by
the projection. As latitude increases, so does the error and as the
latitude approaches the poles, the error goes to infinity. It's easy
to understand that if you think of what the real globe does with
longitude lines as you approach the pole. If you were standing on the
exact pole, you could put your foot on every line of longitude. The
map projection, "World Mercator" uses parallel lines of latitude and
longitude to display a flat Earth. At the pole, the map would be so
stretched as to not show anything useful.
Here are the coordinates for tile "0,0" at zoom level "0" - the entire
world as one tile. This is why you're seeing what you see in the
limits:
LATN: 85.051129
LATS: -84.928321
LNGE: 178.593750
LNGW: -180.000000
NAMEX: 0
NAMEY: 0
PXE: 255
PXW: 0
PYN: 0
PYS: 255
Does it make any better sense now?
-John Coryat
http://maps.huge.info
http://www.usnaviguide.com
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