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CityZen logo: click here.

Definition of megacity and hot spot regions: click here.

Mask for selected megacities around the world (provided by MEGAPOLI): click here (requires login)

Important links to CityZen's sister project, MEGAPOLI:

• Web page: http://megapoli.dmi.dk/
• Description of work: http://megapoli.dmi.dk/nlet/MEGAPOLI_DoW.pdf