I've updated two posts to deal with changes to the Google Maps API, which makes downloading Google Maps tiles more challenging.
In brief, you need to register for a key, enter a credit card number and register the key within R to download Google map tiles as of mid 2018. There is a large amount of tiles that can be downloaded for free (as of this writing), but I have changed my tutorials to use Stamen map tiles, and included code on how to register for a key and use the Google tiles (if you still wish to). The posts that I updated (that used ggmap):
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AuthorJames Paterson Archives
September 2023
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