I do disagree with several parts of that map, though. Alamo Sea being in such close proximity to a forested environment, LS not resembling LA's geography, map appears far too vertical, etc. I have a feeling that R* will respect So Cal's geography and do a good deal of justice to it. I will say though, that their estimation of the LS streets is pretty spot-on. All the screencaps sync up very well to their numbered point on the map, so I believe that that is the single most accurate LS map approximation we've seen yet.
Right after Fitty's, of course.