Google maps and millions of books
Tom Elliott notes that Google "has added overview maps for full-view books in Google Book Search," and he includes an example of a history of New York with street locations marked on a Google map. A commentor on his blog post (Christopher Schmidt) notes that The History of the Peloponnesian War and other works, published online by Gutenkarte, also has "passage-by-passage mapping context."
The results are interesting, showing in particular how the scale of a text can be reflected in the scale of a map. In The Last of the Mohicans, for example the map generated by Chapter 1 shows a wide stretch of the north east stretching from New York to Lake Champlain giving a sense of the geographical scope or scale of the chapter. There is, however, the odd fact that the leader of the French forces Montcalm is misinterpreted as a place in New Hampshire or Vermont (it is difficult to tell which) whereas somehow connecting him with New France would have expanded the scope of the map usefully. Chapter 2 shows a much smaller scale map of the area around Boston, reflecting a narrowing of the narrative scope.
