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A comment on Snapchat Seeks to Raise as Much as $4B in IPO. Parent comment

Re:Snapchat Seeks to Raise as Much as $4B in IPO by bogomipz on Wednesday October 26, 2016 @07:07PM (#12801561)
Can you elaborate a bit on how they use SLAM? I was my (mis?)understanding that SLAM required a pre-existing map. If this is true what are the source of the maps? Are the maps built from previous users's snaps?
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