Soda or Pop?

what is this carbonated beverage? 

Do you call it "pop"?  "soda"?  a brand name soda pop? I ran across a linguistics map showing who calls it what:

Read about it at the Strange Maps blog, The Pop Vs Soda Map.  They cite an article by Luanne von Schneidemesser, PhD in German linguistics and philology (University of Wisconsin-Madison) showing who calls "carbonated beverages" what.  They note that von Schneidemesser is a senior editor of the Dictionary of American Regional English.  

For More Information

• Schneidemesser, Luanne von. "Soda or Pop?" (first page in pdf)  Journal of English Linguistics, 1996 Dec; 24 (4): 270-87.  [article that is basis for blog post]
  
• Strange Maps.  The Pop Vs Soda Map. August 18, 2008.