[pct-l] discrepencies between mapped PCT routes

[m.karon at comcast.net (Marshall Karon)]

I remember Schaffer relating that maps are not always exactly accurate. Many
were created years ago and may not have been correct then. And, certainly
things change that may not have been updated (buildings, roads, clear cuts,
river changes, etc.). But, they are the best one has and they work just
fine. So, maybe the NG maps are better. Maybe you will find out when you get
there. It won't matter.

Marshall Karon
Portland, OR
m.karon@comcast.net

----- Original Message ----- 
From: "Bruce Harvey" <bharve@dslextreme.com>
To: "Robert Gedeon" <robert@beckersurf.com>; "List PacificCrestTrail"
<pct-l@mailman.backcountry.net>
Sent: Monday, April 05, 2004 8:04 PM
Subject: Re: [pct-l] discrepencies between mapped PCT routes


> I bought the TOPO! California series, but decided the guidebook maps are
OK
> and took the state series back unopened.  I suspect the trail trace that
> came with your software/data CD's is the same one you can download from
the
> National Geographic website.  The tracing was done by an individual TOPO!
> user, not by NG.  If you want to check, go to mapXchange on the website
and
> click on either 'download of the week' or 'Pacific Crest Trail, CA'.
>
> Some of the older USGS quads scanned to produce the TOPO! data files
didn't
> have the PCT shown when they were scanned.  Ergo the PCT map file you
have,
> which is a tracing by a private individual, was traced to the best
knowledge
> of the individual.  Where it disagrees with the guidebooks, the latter can
> be regarded as likely more accurate.
>
> ----- Original Message ----- 
> From: "Robert Gedeon" <robert@beckersurf.com>
> To: "List PacificCrestTrail" <pct-l@mailman.backcountry.net>
> Sent: Saturday, April 03, 2004 3:25 PM
> Subject: [pct-l] discrepencies between mapped PCT routes
>
>
> Hello all,
>
>
>
> I was wondering if anyone could give me factual information concerning the
> differences between the PCT route as marked in Schaffer's book (I've the
> newest editions for Southern and Northern CA, although the maps appear to
be
> the same as those in the older editions), and the PCT route as it appears
on
> some of the newer TOPOs out there.
>
>
>
> I ask because I am using National Geographic's TOPO software to get better
> elevation profiles of the trail segments, and I've noticed that the TOPOs
> included with the software include the PCT route. However, the PCT route
> mapped onto these newer TOPOs diverges from the route specified in
> Schaffer's guidebook.
>
>
>
> The actual discrepancies are minimal, and do not concern me in any "real
> world" or practical way. My question instead arises more out of simple
> curiosity, and I was wondering if anyone could explain the discrepancies.
> Not to sound anal, but I'm not interested in conjecture on this point (I
> myself with my friends can posit any number of reasons why the
discrepancies
> "might" be there). Rather, I was wondering if anyone knew for a FACT
whether
> Schaffer's route or the route shown on the National Geographic TOPOs is
more
> accurate.
>
>
>
> Anyone know?
>
>
>
>
> Thanks,
>
>
>
> Robert
>
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