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corrected XYZ -> ZXY for clarity #59

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corrected XYZ -> ZXY for clarity #59

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2 changes: 1 addition & 1 deletion 1.3/spec.md
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Original file line number Diff line number Diff line change
Expand Up @@ -121,7 +121,7 @@ of the tile, following the
with the restriction that
the [global-mercator](http://wiki.osgeo.org/wiki/Tile_Map_Service_Specification#global-mercator) (aka Spherical Mercator) profile MUST be used.

Note that in the TMS tiling scheme, the Y axis is reversed from the "XYZ" coordinate system commonly used in the URLs
Note that in the TMS tiling scheme, the Y axis is reversed from the "ZXY" coordinate system commonly used in the URLs
to request individual tiles, so the tile commonly referred to as 11/327/791 is inserted as
`zoom_level` 11, `tile_column` 327, and `tile_row` 1256, since 1256 is 2^11 - 1 - 791.

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