Move doc from wiki to repo, closes #85

2015-07-01 07:01:50 -07:00
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+Return pixel resolution of tiles at a given zoom level
+
+#### Using the function
+
+Take a common tile with zoom, z=2,
+
+![2/3/2](https://viz2.cartodb.com/tiles/quantile_breaks/2/3/2.png)
+
+To determine the resolution of these pixels,
+
+```sql
+SELECT CDB_XYZ_Resolution(2)
+--- Returns a float, 39135.7587890625
+```
+
+#### Arguements
+
+CDB_XYZ_Resolution(z)
+
+* **z** integer