aha & far better
we just ask the egypt border force if it happens to have gps era survey data on this
southernmost egly marker at any level of exactitude
& extrapolate eglysd from it
aha
of course
--- In BoundaryPoint@yahoogroups.com, aletheia kallos <aletheiak@y...> wrote:
>
> yikes i have been so gulled into thinking we are
> dealing with a set of normal boundaries here at eglysd
> & that they will be behaving like any others
> like
> for example
> by my just assuming
> that the only convergent of the 3 that has been
> somewhat normally demarcated would have therefore
> necessarily been datumized
>
>
> but obviously all 3 of these eglysd boundaries are
> about as nonnormal & neglected as can be
> not only in point of their general remoteness &
> wildness
> but also in point of their muslim indifference
>
>
> for i have just realized that tho we can certainly
> expect to find some documentation of the 1927 egit
> demarcation commission somewhere & possibly even its
> survey plats
> the mapping of desolate wastelands even today is
> rarely if ever done to a large enough scale for a
> datum to become noticeable
>
> & for good reason
>
> for in such extreme deserts as we are talking about
> here
> even more than on any ordinary multipointing try
> a shift in datum would tend to be of no practical
> consequence & thus purely academic at best
>
> indeed only in the gps era could a datum ever have
> mattered in such remote areas
> & what it matters for even now seems to be only a
> matter of entertainment & curiosity value
> rather than anything really practical that i can think
> of
>
> & therefore
> i hypothesize
> even the semi european 1927 egit demarcation
> commission
> could very easily have deliberately dispensed with &
> neglected to specify a datum on their plats or
> anywhere in their report
> & likewise the 1938 proces verbal on the 9 marker
> modifications
>
> for monument coords in undatumized integral degminsec
> or roughly 100 foot squares
> would have served everyone just fine in all 3 of these
> delimitation areas
> including all along egly
> which is the least remote of them
> & even if these coords wandered or erred by another
> second or even several for any reason
> well who would ever have cared or noticed anyway
> so long as the monuments hove into view when being
> looked for
>
> & intervisibility of monumentation was reportedly very
> important if not the whole deal on egly
> as far inland as the demarcation went anyway
>
>
> i am also reminded that as recently as 20 years ago
> usgs topos in scales equal to the largest known
> nonurban egyptian & libyan ones
> namely 1 to 100k
> allowed 50 meters of fudge
>
> & the state of 1927 survey & mapping art at least
> doubled that standard potential deviation
>
> so there is really little reason to suppose anyone
> cared about the datum then
> or even has cared ever since
>
> or dont you agree
> now that we have looked at it again
>
>
> it may well be that all 3 countries have gone to
> completely modern gis systems in the meantime
> but that is still no reason to conclude that their
> borders have ever been expressed in so exacting a way
> bilaterally or trilaterally
>
>
> so now that i have had all this time to research &
> think about it
> more to the point than datum chasing
> it seems to me
> as well as the best we can probably really hope to do
> in any case now
> would be to simply find the true longitude of the
> nearest 25th meridian egly rock in any datum
> using a pilotage gpsr of course for submeter accuracy
> & extend that meridian to its intersection with the
> 22nd parallel in the same datum
> to nail the correct or at least the most likely & best
> available square meter
> in any datum anyone likes
>
>
> & then btw compare this with wgs84 if it isnt already
> expressed that way
> so as to correctly classify the 22x25 confluence photo
> try that set off & indeed has kept inspiring this
> entire tryfull caravanserai of delights
> as well as place the extrapolated tripoint position
> within its frame & in relation to the subject in the
> photo
>
> like how close really was that dude anyway
>
>
> & this closest & most necessary reference rock
> most likely number 178 of the original 1927
> demarcation
> is indicated by the ibs to be on the 25th meridian
> around 487 miles due north of eglysd
> or in other words at around the 29th parallel
>
>
> & of course the down side of this method is that we
> will probably have to actually go there to africa to
> do it ourselves
> rather than being able to expect to have the answer
> delivered to us from an archive
>
> but at least i think we have probably dispelled one
> more probable mirage
> which is that you cant get there from the archive in
> this case
>
>
>
>
>
>
>
>
>
>
>
>
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