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According to Mapolis, the platinum maps they offer are the ones used by mapquest.
This is an excerpt from the Mapolis FAQ:
What are the differences among map types?
There are principally 3 different types of maps that we offer to the user. They are the basic, enhanced, and platinum maps. Mapopolis maps collectively cover the United States. Each county map file contains information for one county or county equivalent. The map data source for the basic and enhanced maps is the US Census Bureau's TIGER '00 database. The map data source for the platinum maps is licensed from Navigation Technologies, which also provides map data for MapQuest.
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