I didn’t want to hijack this thread http://boards.straightdope.com/sdmb/showthread.php?t=326707
in which is discussed glaring errors in geography made by authors, playwrights, screen writers, and so on.
So what have you seen done correctly? I’ll nominate three novels by Lee Killough, cop stories set about seventy years in our future. The main setting of the stories is my home town, Topeka, Kansas. There are of course* new* buildings and places that don’t yet exist. But when she mentions street names or existing buildings, or the Topeka Cemetery, she puts them in the right places.