sent from a phone

> On 13. Mar 2019, at 15:44, Sergio Manzi <s...@smz.it> wrote:
> 
> Have mappers walked along the whole world coastlines? Have they descended all 
> world's rivers by canoe? Have all Mumbay, New York, Rome, Shanghai, etc., 
> streets and alleys been walked by volunteers mapping their location and 
> names? All the peaks escalated?


I don’t know about New York or Shanghai, but in Rome the mappers have indeed 
walked the streets, usually multiple times since 2004. Definitely not based on 
imported data. Neither are rivers or the coastline, these features are derived 
from aerial imagery (not an import).

Ciao, Martin 
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