Locations on Daesch's maps are not always 100% faithful to the in-game maps, but they're more geographically accurate (they were somewhat approximated in the games).
As for Necropolis, the problem is that it's said to be in the location of Bakersfield in in-game text and the FO Bible timeline, while it's actually placed on the in-game map in the location of Barstow - it was moved on the map, but someone forgot to change the text files. Hence Daesch went with Bakersfield, not Barstow - because of this error both are just as valid.
The location of Broken Hills is dead wrong, though. But it should be fixed in the next version.
The tags are for the games the locations are from. 1 - FO1, 2 - FO2, 3 - FO3, T - FOT, V - Van Buren, B - FOBOS. The ones with no tags are mentioned-only.
Aside from Carbon, there's also a ghoul town of Los in FOBOS, but we have no idea which of the Los Somethingos cities of Texas it is. Anyone played FOBOS and remembers?