How do you translate GTileLayer X/Y/Z coordinates in to LatLon
coordinates?

I tried this:
Lat = ( -180 * y / Math.pow( 2, z ) ) + 90
Lon = ( 360 * x / Math.pow( 2, z ) ) - 180

For points around New York at zoom level 8, Lon seems close (possibly
accurate), but Lat is way far away (someplace in northern Canada).

Do all tiles span the same number of degrees for a given zoom level?
Or does the span change based on latitude?

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