Questions about SafeGraph restaurant records

Hi SafeGraph, I would like to ask a few clarification questions.

  1. How good is the coverage of restaurants? Could you give me some statistics about the coverage?

  2. How do SafeGraph assign the descriptive tags to restaurants? Is it by algorithm that generates the tags based on name or other information or is it by a worker that generates the tags?

  3. When sample the smartphone signals, does SafeGraph use stratified sampling for places that have low populations? Thanks!