How are Google Maps created? I really don't know, but I am guessing that it starts at the
Google MapMaker site. Check it out.
Executive summary: Anyone with a Google (Gmail) account can add map detail to the satellite images. So, if you have intimate details about a specific area of DR, I recommend you log on and share your knowledge.
For starters, adding the directions of the many one-way streets in Sto. Dom. would be a good contribution.
Once at the website, simply zoom in to DR and start to explore. The map on this site has better detail than the regular Google map site.