ok
it is an even better conundrum now that i presumably have the
right data
again
& only part of the difficulty lies in how many significant digits to
trust from each source
but trusting only the fewest & most reliable decimal places
the data on the tablet do place the 1909 disk something on the
order of 3 meters south of true caus
risking an additional decimal place
the gap shrinks to something on the order of 2 meters
so there is reason to believe the supposedly authoritative 1909
bcidwa disk stands 2 or 3 meters south of true bcidwa
& yikes again
for that is a third or a half of the full width of the clearcut
& your visuals
on the other hand
particularly 7 & 13 & 14
seem to show the bcidwa marker either perfectly on caus
if we can trust the clearcut edges as being uniformly true
which of course we cant
or
if anything
they appear to place this marker a tad north of true caus
rather than any distance south of it at all
so there is also contrary if weaker reason to believe the
geocoords are still insufficiently accurate
& your gps accuracy range of 5 meters wont help resolve this
apparent contradiction
but there is something in your experience that might resolve it
would you happen to have an unpublished photo like number 8
but taken from directly behind the obelisk apex at close range
including the clearcut down thru bcidwa & up to the horizon
or regardless of whether you made such a photo
do you recall trying to eyeball all 3 markers at once in this way
& what you saw when you did
probably just an overgrown clearcut & nothing else
i realize
but that is the only question i can think of pursuing at this point
to more nearly pinpoint true bcidwa & upgrade the validation
--- In
BoundaryPoint@yahoogroups.com, "aletheiak"
<aletheiak@y...> wrote:
> never mind
>
> i figured out what was wrong
>
> the correct monument numbers are 194 & 195
> not 195 & 196
> dohhh
>
> back to the cruncher & i will report in again with real findings
> asap
>
> --- In BoundaryPoint@yahoogroups.com, "aletheiak"
> <aletheiak@y...> wrote:
> > --- In BoundaryPoint@yahoogroups.com, "Dave Patton
[DCP]"
> > <dpatton@c...> wrote:
> > > I've posted the narrative and photos detailing my
> > > recent visit to the British Columbia/Idaho/Washington
> > > (BCIDWA) tripoint and 49N 117W degree confluence on
> > > the Degree Confluence Project website:
> > >
> >
>
http://www.confluence.org/confluence.php?lat=49&lon=-117&visi
> > t=4
> > >
> > > Hopefully the combination of the narrative and photos
> > > will answer some of the questions raised in the prior
> > > thread I started about BCIDWA(and BCIDMT).
> > >
> > > I'll leave it to 'the experts' to determine what class
> > > of tripoint visit this is ;-)
> >
> > me too
> > as there are several difficulties here beyond my ability to
> resolve
> >
> > first
> > tho i did get a good look at your excellent report last night
> > the confluence page seems to have seized up this morning
> > so i cant get back to it now to double check the data
> > tho i trust it will soon be restored
> >
> > but in any case
> > when it was working
> > i was able to copy these nad83 coords for the 1909 disk
> > as presented on the 1998 tablet
> > nlat 48d59s57s110
> > wlong 117d01m56s715
> >
> > & tho the bcidwa monument does appear to be situated near
> the
> > middle of the clearcut & therefore nearly smack dab on caus
> > these coords dont compare well to the nad83 coords for the
> > neighboring markers published by the ibc
> >
> > namely
> > marker 196 to the east
> > nlat 48d59m57s6
> > wlong 116d59m28s0
> > & marker 195 to the west
> > nlat 48d59m57s2
> > wlong 117d01m43s6
> >
> > if all 3 sets of coords are correctly stated
> > the bcidwa marker would lie some distance west of 195
> > yikes
> > as well as about 30 feet south of the clearcut
> > yikes again
> >
> > so something is clearly & seriously out of whack there
> >
> > but maybe i should wait til you get the report on line again
> > so i can at least compare your gps readings to these coords
> > just to get an idea which ones might be off
> >
> > in any event
> > forgetting the coords for the moment
> > & based on your pix & descriptions alone
> > it certainly looks like at least class c
> >
> > > If it's in some way important to the visit class, I
> > > did touch the monument, the USGS brass cap, the US GLO
> > > brass cap, the LSAW plaque, and the ground all around
> > > the monument.
> > >
> > > --
> > > Dave Patton
> > > Canadian Coordinator, Degree Confluence Project
> > > http://www.confluence.org/
> > > My website: http://members.shaw.ca/davepatton/