[PRCo] Re: Old topo map question

[Donald Galt]

On 1 Jun 2005 at 13:48, robert netzlof wrote:

> > Maybe copied, then.
> 
> Could be, of course. On the other hand, there weren't very many
> editions of any of the maps, often only one. So, party A sets out to
> scan a complete set, party B does the same. They're going to end up
> with the same dates because that's all there are.
> 

I thought about that, but decided to go ahead and make the unproved implication 
of copying anyway. This is the Internet, after all         :-)

Since then, though, I've done a little test - not an exhaustive test but a 
fairly good sample.

Maptech and Pmtmate both are punctilious about listing edition dates and 
reprint dates. I made a comparison - a sample, not an exhaustive check - with 
my own hard copies and found that I had a number of different reprint dates 
where Maptech and Pmtmate are in lockstep. So if they were independently 
scanned it must at least have been from the same collection(s).  

Further observation: Maptech's selection is limited to the Northeast, south to 
Virginia and west to Ohio. The CDs I have seen advertised are - south to 
Virginia and west to Ohio. 

Coincidences are possible.  I just don't I think I'll bother to buy one of the 
CDs.

Don