since both the canadian commissioner & deputy never heard of
nad27canada
& since nad27 unqualified is the same as nad27conus
i feel even more confident now that the datum used for the nad27
ibc coords was indeed nad27conus rather than nad27canada
& that our final estimate for true bcidwa of 18 inches due north of
the 1909 idwa disk center
plus or minus 6 inches
is not only as correct as can be
but is also not about to be improved upon any time soon
--- In
BoundaryPoint@yahoogroups.com, "Dave Patton [DCP]"
<dpatton@c...> wrote:
> At 01:39 PM 2004/08/01, Dave Patton [DCP] wrote:
> >At 12:58 PM 2004/08/01, aletheiak wrote:
> > >dave
> > >
> > >just to sum up now as much as possible
> >
> > > > I have sent an email to the IBC asking what version of
NAD27
> > > > they have used, but haven't yet received an answer.
> > > > I assumed NAD27 CONUS.
> > >
> > >right
> > >& since no news is good news
> > >i am even more prepared now than i already was to
assume this
> > >with you too
> >
> >I'm still waiting. The person I emailed has been out of the
> >office. I spoke to the secretary of the commissioner last
> >week, and she is going to try and get the person I emailed
> >to contact me this coming week, after the long weekend.
>
> I have spoken to both the Canadian Commissioner and
Deputy
> Commissioner of the IBC:
> - neither one was aware that there are variations of NAD27
> - neither one knows what variation the IBC website boundary
> coordinates are using
> - neither one knows the answer to the "straight lines vs
> curved parallels" issue for the history of the boundary
> west of the Rockies
>
> The Deputy Commissioner confirmed that regardless of any
> coordinates listed as "official" on their website, the
> boundary is defined by the monuments.
>
> The Deputy Commissioner said that if a monument was
destroyed,
> such coordinates would be one of the last things used in
> replacing the monument. They would use nearby existing
> monuments, and records with information such as distance
> between monuments, bearings, etc.
>
> I have sent another email to the Deputy Commissioner with
> the datum and 'straight vs parallel' questions, and he is
> going to forward it to the US IBC office, to see if they
> have any further information.
>
> I don't expect to hear back for a while, as both the Canadian
> and US commissioners just left for a two-week inspection tour
> of part of the boundary. I don't know which part of the
> boundary, but they do this periodically as part of the planning
> for the boundary maintenance, and they don't walk, they use
> helicopters.
>
>
>
>
> --
> Dave Patton
> Canadian Coordinator, Degree Confluence Project
> http://www.confluence.org/
> My website: http://members.shaw.ca/davepatton/