出現頻度が高いほど緑色が濃い。ロシアや中国よりもインドが濃いのは英語圏だからみたい。
Inside Google Book Search: Earth viewed from books:
I love data. That was no small factor in my decision to join Google. I started a month ago and have already learned a lot, but I wanted to try and put together many of the components I've learned to solve an interesting problem. So, last week I made one up: map the world, based on the frequency of its locations mentioned in books.
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