I want to create a navigation software and I need strong maps.
How can to export Google maps data and understand them for creating new navigation software?
Is it illegal?
I want to create a navigation software and I need strong maps. How can
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You cannot export Google maps data. In fact you aren’t even allowed to cache them:
All google maps usage must be through the appropriate google maps API which specifically forbids turn-by-turn navigation if that is where you were going with this.
As an alternative you can try openstreetmap.org and check out their API usage policy
Basically you can download the entire planet as vectorized data from various planet.osm mirrors