dave i also just realized your best guessed position for true
bcidwa
of about half an inch north of disk center
if i have understood everything right
is still based only on hearsay
granted it is the testimony of a local & an expert
but i dont think we have actually confirmed even class c yet
by any objective criteria
the disk could be substantially farther off line in either direction
than either of us has previously supposed
so until we tie the monument positions together
we cant even presume class d
you may not yet have actually seen true bcidwa
since you may not yet actually know where it is
you have at least a very earnest class e tho
that can never be doubted
--- In
BoundaryPoint@yahoogroups.com, "aletheiak"
<aletheiak@y...> wrote:
> ok
> i was imagining you actually had a sight line
> or else actually performed great circle distance computations
> based on the published or empirically determined geocoords
for
> all 3 markers
> on which to base your estimated half inch offset
> & to claim a correspondingly measured class b visit
>
> so evidently it was not quite so punctilious as i had thought
>
> but still
> you are certainly looking at no less than a very close class c
visit
>
>
> also it may be worth noting that if the 1909 idwa marker really
> was set exactly on the 49th parallel as i believe your informant
> reported
> however improbably so
> given the state of survey art as of that date
> it would not have fallen south of caus
> as he apparently also concluded
> but north of it
> by both the nad27 & the nad83 ibs coords
> yikes
>
> & that would mean the disk center isnt in the usa at all but in
> canada
> yikes
> & that true bcidwa isnt half an inch north but some unknown
> distance south of the disk center
>
> which direction is frankly hard to believe
> tho thats what the data as presented are adding up to saying
>
> so happily we still have somewhere to go in fine tuning this
one
>
> usgs bulletin 466 for starters
> since the bible promises it somehow ties the markers together
>
> --- In BoundaryPoint@yahoogroups.com, "Dave Patton [DCP]"
> <dpatton@c...> wrote:
> > At 02:32 PM 2004/07/21, aletheiak wrote:
> > >were you actually able to sight along the caus line from
> marker
> > >195 to marker 194 across the face of the 1909 idwa
terminal
> marker
> >
> > No - that's impossible given the terrain in the area.
> >
> > >or exactly how did your discovery of this eccentric point
> location
> > >take place
> >
> > Information from a conversation with a surveyor who, in part,
> > is using information from the old USGS bulletin. It was a brief
> > conversation, and I don't have the bulletin, and the surveyor
> > was going from memory, so don't rely on any specifics.
> >
> > As I said, it raised in my mind the theoretical possibility,
> > but now I think it's not a valid concern, because the state
> > boundaries are terminated at an 'imaginary' point where the
> > line meets the Canada/USA border, regardless of where the
> > monument is located.
> >
> >
> >
> > --
> > Dave Patton
> > Canadian Coordinator, Degree Confluence Project
> > http://www.confluence.org/
> > My website: http://members.shaw.ca/davepatton/