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## #1 2008-08-08 13:43:43

**Barguast****Member**- Registered: 2008-07-24
- Posts: 4

### Complex mathematical question... Help!

Okay...

If I have a viewport of the Slippy map (Mercator projection) which is 'w' pixels wide, and 'h' pixels high, and we're at zoom-level 'Z', what is the range of x and y Mercator coordinates?

For example, if the viewport is 256 x 256 and we're at zoom level 0, then there should be a range of 360 x-coordinates (-180 to 180 degrees), and 360 y-coordinates (also -180 degrees).

I know, a bit of a strange question. Please reply if you have any questions (or answers for that matter!)

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## #2 2008-08-08 14:34:43

**Barguast****Member**- Registered: 2008-07-24
- Posts: 4

### Re: Complex mathematical question... Help!

Nevermind, I figured it out;

x-span = 360 * (width / (256 * (2 ^ zoom)))

y-span = 360 * (height / (256 * (2 ^ zoom)))

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