Jeff Allen wrote:
This type of linguistic atlas of American dialects is far from new. I used the US dialect work of William Labov and others (much documented by the American Dialect Society) in the late 90s and early 2000s to set up and conduct language recording for a major speech data collection project.
SPEECH DAT CAR. A Large Speech Database For Automotive Environments
Section 2.3 of the May 2000 LREC conf paper gives some specific details of the US English project which I managed.
The results of the project (a bit out of the average person's price range to purchase)
American English SpeechDat-Car
Catalog Reference : ELRA-S0115
NOTE: Other details about the standard procedures for data definition and data collection are described in other conf papers from the same project:
I wanted to buy the Labov atlas for myself when it was published - back then I recall a purchase price of $600-700, so I refrained. Today the work is even more expensive, Amazon sells it at $900+.
That's why I was more than happy to find a similar and condensed map on Aschmann's website.
[Edited at 2013-05-12 19:16 GMT]