Google says it will publish user location data around the world from Friday to allow governments to gauge the effectiveness of social distancing measures, brought in to stem the COVID-19 pandemic.
The reports on users' movements in 131 countries will be made available on a special website and will "chart movement trends over time by geography", according to a post on one of Google's blogs.
Trends will display "a percentage point increase or decrease in visits" to locations like parks, shops, homes and places of work, not "the absolute number of visits," said the post, signed by Jen Fitzpatrick, who leads Google Maps, and the company's chief health officer Karen DeSalvo.
For example, in France, visits to restaurants, cafes, shopping centers, museums or theme parks have plunged by 88% from their normal levels, the data showed.
Local shops initially saw a jump of 40% when confinement measures where announced, before suffering a drop of 72%.
Office use is possibly stronger than suspected meanwhile, as the decline in that area is a more modest 56%.
"We hope these reports will help support decisions about how to manage the COVID-19 pandemic," the Google execs said.
"This information could help officials understand changes in essential trips that can shape recommendations on business hours or inform delivery service offerings."
Like the detection of traffic jams or traffic measurement Google Maps, the new reports will use "aggregated, anonymized" data from users who have activated their location history.
No "personally identifiable information," such as an individual's location, contacts or movements, will be made available, the post said.
The reports will also employ a statistical technique that adds "artificial noise" to raw data, making it harder for users to be identified.
From China to Singapore to Israel, governments have ordered electronic monitoring of their citizens' movements in an effort to limit the spread of the virus, which has infected more than a million people and killed over 50,000 worldwide.
In Europe and the U.S., technology firms have begun sharing "anonymized" smartphone data to better track the outbreak.
Even privacy-loving Germany is considering using a smartphone app to help manage the spread of the disease.
But activists say authoritarian regimes are using the coronavirus as a pretext to suppress independent speech and increase surveillance.
In liberal democracies, others fear widespread data harvesting and intrusion could bring lasting harm to privacy and digital rights.
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