The difference between the raw map data and an actual map has nothing to do with whether either form is stored in a computer. The computer is irrelevant. The difference is that, barring some original selection or arrangement, raw map data is nothing but an unoriginal collection of facts. A map based on that data at least has the potential to employ an original form of representation, whether the result is stored on paper or as a digital image.
Note that a "book full of nothing but facts", e.g. a telephone directory, is no *more* copyrightable in digital form than it is as a printed book--despite the fact that books are included at least as explicitly in copyright legislation as maps. The map data under discussion is no different than the entries in that phone book. The form of the work (book or map) is not enough to qualify; the expression must be *original* as well. It is the creative expression which copyright covers, not the facts. If all you have is facts, with no creative element, then copyright does not apply.