Subject: Re: [BoundaryPoint] dcmdvan & mdvawv retries continued
Date: Sep 23, 2004 @ 22:43
Author: Lowell G. McManus ("Lowell G. McManus" <mcmanus71496@...>)
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----- Original Message -----
From: "aletheia kallos" <aletheiak@...>
To: <BoundaryPoint@yahoogroups.com>
Sent: Thursday, September 23, 2004 2:49 PM
Subject: [BoundaryPoint] dcmdvan & mdvawv retries continued
>
> so
> to sum up & then proceed
>
> the best available & indeed authoritative positions
> if not of these 2 tripoints themselves
> then at least of the low water marks convergent upon
> them
> is as presented by usgs mapping
>
>
http://www.topozone.come/map.asp?z=18&n=4311741.00001324&e=316164.999969563&datum=nad83
>
>
>
http://www.topozone.com/map.asp?z=18&n=4355975&e=265574&s=50&size=l&datum=nad83&layer=DRG25
>
> so the geocoords need to be carefully lifted from the
> paper copies of these topos
> & then used as the primary gps targets
> for the monument based alignments to then pan across &
> home in on
>
> & we need to hope mike schwartz has a gps receiver
>
> or that someone who does also attends
>
> or can you confirm that right off mike
>
>
> also
> special to brian
> can you confirm that the superfine coords you give for
> these points at the corner corner
> namely
> dcmdvan
> nlat 38d56m03s2 x wlong 77d07m12s6 nad27
> &
> mdvawv
> nlat 39d19m16s1 x wlong 77d43m09s4 nad27
> are the same ones you pulled from the paper topos
> & that your tenths of seconds are as significant as
> they appear to be
>
> as i recall
> you took special care with all these at the time
>
> & i am inclined to base the tries directly upon them
> since i already believe they are as right as can be
> rather than bothering to check or redo your work
>
> but i would appreciate any confirmation
>
>
>
> & to continue
>
> the dcmdvan alignment will be straightforward &
> attainable within centimeters if we find the marker
>
> as i still believe we will
>
> & nothing more needs to be said about it til we try it
>
>
> but the mdvawv alignment is still unknown
> & perhaps unknowable
>
> & we also dont know what authority we could possibly
> consult that would be better than ourselves & our own
> best judgments about it
>
> so far we have 4 choices for the bearing of the
> tripointing stitch from the extant vawv terminus
> each of which will produce a different line
> all of them presumably of slightly different lengths
> & each leading to a different putative tripoint
> position
>
> but we should probably carry all of these forward
> & be open to possible others as well
>
>
> the bearing of the extant legal vawv terminal segment
> is ne36d40m22s
> & i believe it continues to be the leading candidate
>
> the bearing of a line running perpendicular to the
> bank appears to be roughly ne10 degrees
>
> the bearing of a line running perpendicular to the
> river center line appears to be roughly due north
>
> the bearing of a line running directly toward the
> visible ridge continuation above the maryland bank
> appears to be roughly nw10 degrees
>
>
> & there are still a few more numbers i should be able
> to crunch
> so as to tie the topo based coords in with the survey
> based coords
>
> & that should be revealing but will take a while
>
> so please stand by
> &or chime in with anything else
>
>
> of course all four stitch candidates will ultimately
> head off into the white water in different directions
>
> but we could follow them at least to the edge of the
> water & then project them mentally from there
>
> for the time being at least
>
>
> both tries are still looking real for columbus week
> give or take a few days
>
> any further additions corrections comments help
> attendance etc etc would of course be appreciated
>
>
>
>
>
>
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