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Pinwheel, a new site created by Flickr cofounder Caterina Fake, lets users post virtual notes anywhere.
Small ground-based transmitters that mimic GPS satellites help receivers find their position with high accuracy.
A missile-targeting technology is adapted to process aerial photos into 3-D city maps sharper than Google Earth’s.
Phone app Waze uses real-time information shared by drivers to tweak its directions and traffic advice.
Software lets citizens snap and geographically tag urban blight.
Businesses are quietly buying mobile-phone data to discover the paths that consumers take.
Nobody knows how to get around a city like a taxi driver. A new method for creating online maps taps into that expertise.
Unhappy customers often tweet their gripes—now AT&T is mining those complaints to improve its service.
Ads targeted to a person’s location are an advertiser’s dream. The reality is more complicated.