
The following samples based on data provided by OpenStreetMap:
eu_1200.png
eu_2400.png
us_1300.png
us_2900.png
shanghai_3500.jpg

OpenStreetMap is open data, licensed under the Open Data Commons Open Database
 License (ODbL) by the OpenStreetMap Foundation (OSMF).  You are free to copy,
 distribute,  transmit  and  adapt  OpenStreetMap data, as long  as you credit 
 OpenStreetMap and its contributors.  If you alter or build upon our data, you 
 may distribute the result only under the same licence.

http://www.openstreetmap.org/copyright
