The Google Maps terrain view by default has unlimited panning of the map tile. You can use LatLngBounds() to limit this, but what are the maximum and minimum co
See this post in the old Google Groups, which describes the math of the projection.
Quote:
the map doesn't start at 85 degrees, but rather the degree that makes the map square. This is can be simply calaculated as: atan(sinh(PI)) *180 / PI = 85.05112878....
Note that the tile calculation in that post is for the old API V2, but the projection should be the same.