How is the map drawn in pokemon go? where does the data come from?

Question

Android

Question in the title: How is the map drawn in pokemon go? where does the data come from? I used to develop applications before - a beginner. It remains a mystery to me how the streets are drawn in this game, where do the sizes, coordinates come from?

Answer 1

Seems like any open source type OSM is fine, correct me if I'm wrong.