Subject: Re: [BoundaryPoint] Re: EGLYSD class b
Date: Jan 05, 2006 @ 05:44
Author: Lowell G. McManus ("Lowell G. McManus" <lgm@...>)
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----- Original Message -----
From: "aletheia kallos" <aletheiak@...>
To: <BoundaryPoint@yahoogroups.com>
Sent: Wednesday, January 04, 2006 10:51 PM
Subject: RE: [BoundaryPoint] Re: EGLYSD class b
> nice stuff thanx
> & please look for quite a few inserts ahead
>
> --- Hugh Wallis <hugh@...> wrote:
>
>> >>thus as likely wgs84 as any<<
>>
>> definitely won't be WGS84 since that was not in use
>> until 1984 (hence the
>> "84" in its name).
>
> hahaha you certainly may disallow me & i knew dat
> about 84
> but i dont infer wgs84 should be ruled out for that
> reason
>
> on the contrary i think the relative newness &
> universality of wgs84 may especially recommend &
> automatically promote it in this special case
>
> for diametrically unlike the maritime borders of
> indonesia
> where technical & legal complications create a
> particular urgency to get all these datums clarified
> the situation at eglysd smacks of complete
> indifference & utter neglect over many decades
>
> & so i reason in the apparent absence of any evidence
> of a specified datum for this point since its creation
> in 1925 til the present
> that it either remains unspecified until today & thus
> highly subject to the wgs84 default principle
> or else that any specificity it may have acquired
> would most likely have occurred post 1984 & would thus
> very likely be in the form of wgs84 for that reason as
> well
>
> also where so many as 3 parties are involved universal
> norms tend to be preferred to local ones
>
> your indonesia text says flat out
> for its own special case but with universal
> applicability in this case
> wgs84 seems to be most sensible to adopt
> &
> all decisions should be legally agreed by all
> countries involved
>
>> I suspect that the Egypt 1907 Datum might have been
>> used
>
> but what in particular leads you to guess egypt 1907
>
> i can imagine egypt & sudan adopting it but not so
> readily libya
>
>> - but see
>>
> <http://www.fig.net/pub/cairo/papers/ts_45/ts45_01_abidin_etal.pdf>
>>
> http://www.fig.net/pub/cairo/papers/ts_45/ts45_01_abidin_etal.pdf
>> where it
>> notes, using Indonesian maritime boundaries as its
>> focus, that often the
>> datum is NOT specifically denoted in a relevant
>> treaty
>
> exactly my point as well as my guess here at eglysd
> since day 1 in 1925 & even up to the present
>
>> and discusses the
>> issues that arise as a result.
>
> yes naturally many in the worlds busiest seas but none
> in the worlds most desolate wasteland
>
>> If you don't have
>> time to read the whole
>> paper
>
> who me
> i have all the time in the world for such
> deliciousness
>
>> the following section from the summary can
>> help to understand the
>> thesis:
>>
>> "The uncertainty in geodetic datum of boundary
>> points introduces
>> complications and problems
>> in spatial management of Indonesia's maritime
>> boundaries, since it can
>> displace the boundary
>> lines from their assumed true location. The
>> displacements of boundaries in
>> WGS84 datum are
>> generally in the order of a few hundred meters, i.e.
>> about 200 to 400 m,
>
> indeed did you notice 420m was the max they cited
> later in the article
>
> sounds like your datum shift demo wants to take place
> in the indonesian jungles
>
>> depending on the
>> assumed original geodetic datum of the boundaries
>> stated in the treaties.
>> These boundary
>> displacements are spatially advantageous for
>> Indonesia in some cases and
>> also
>> disadvantageous in others."
>
> i also appreciated & hope you did too the specific
> reference in this article to the attainment of
> submeter level accuracy in pilotage by ecdis dgps in
> 2004
> which nicely fills in a blank space in our earlier
> discussion here
> http://groups.yahoo.com/group/BoundaryPoint/message/18568
>
> end inserts
> & sweet dreams
>
>
>> The following paper might be relevant to EGLYSD -
>>
> http://www.asprs.org/resources/grids/06-2003-kenya.pdf
>> - although it
>> primarily refers to Kenya it also mentions the use
>> of various datums in
>> Egypt and the Sudan.
>>
>> Googling "latitude longitude datum egypt" will
>> provide a host of other links
>> too numerous to reproduce here that will provide a
>> wealth of additional
>> information.
>>
>>
>>
>>
>> _____
>>
>> From: BoundaryPoint@yahoogroups.com
>> [mailto:BoundaryPoint@yahoogroups.com]
>> On Behalf Of aletheiak
>> Sent: Wednesday, January 04, 2006 8:33 PM
>> To: BoundaryPoint@yahoogroups.com
>> Subject: [BoundaryPoint] Re: EGLYSD class b
>>
>>
>> there is no mention in any of the relevant ibs
>> numbers that the 1925 italian
>> egyptian
>> agreement establishing this tripoint or the 1934
>> italo british egyptian
>> agreement
>> reaffirming it included any official maps or even
>> specified any official
>> datum or datums
>>
>> various british french american & north african maps
>> of the 1930s thru 1960s
>> tho are said
>> there to reliably depict the various borders
>> convergent here at eglysd
>>
>> & one cant conclude the datum is elusive for it
>> might well just be the
>> common &
>> nonelusive default datum of
>> none specified
>> & thus as likely wgs84 as any
>> in which case the try or rather the result would
>> indeed be a very loose
>> class b
>> as represented by the little man in the gully in the
>> first pic
>> or more likely a tight class c at probably 14 meter
>> range
>> but if this is not correct
>> then there remains some possibility of a class d or
>> even class e
>>
>> for there also remains an outside chance that the
>> tripoint is in fact marked
>> whether by an official durable marker
>> since some other parts of these remote borders are
>> so marked
>> or even by just some little cairn or something these
>> folks could have missed
>> since there is also no evidence that they were
>> really studying the border
>> alignments or
>> trying for the tripoint in any other way than just
>> for the lat long
>> intersection
>>
>> --- In BoundaryPoint@yahoogroups.com, "aletheiak"
>> <aletheiak@y...> wrote:
>> >
>> > wow
>> > nicely done
>> > & a pleasure to see the shots back on goal & the
>> discussion back on target
>> again
>> >
>> > & since all 3 ibs numbers
>> > 10 & 18 & 61
>> > join brownlie in indicating this tripoint is
>> unmarked
>> > or at least was unmarked as recently as 1979
>> > it is hard to argue with the bona fides of their
>> perfect gps readings
>> > no matter what datum they may have been using
>> >
>> > but since even they are only claiming 14 meter
>> range at best
>> > & were having difficulty getting it
>> > i think i would credit them only with a class c
>> > as in seeing the objective for certain with their
>> eyes
>> > somehow
>> > at some point
>> > in their overall visitation process
>> > rather than a class b
>> > as in necessarily having been at the exact spot
>> with their bodies
>> > for i think that honor would remain to be won
>> > in this unusual circumstance
>> > by someone with a better quality gps receiver
>> >
>> > --- In BoundaryPoint@yahoogroups.com, "Jesper
>> Nielsen" <jesniel@i...>
>> wrote:
>> > >
>> > > Thanks to the unknown visitor to Borderbase, who
>> submitted the entry
>> > >
>> > >
>> > >
>> > > http://www.confluence.org/confluence.php?lat=22
>> > > <http://www.confluence.org/confluence.php?lat=22
>>
> <http://www.confluence.org/confluence.php?lat=22&lon=25>
>> &lon=25> &lon=25
>> > >
>> > >
>> > >
>> > > Jesper
>> > >
>> > >
>> > >
>> > > --
>> > >
>> > > Borderbase - your online guide to international
>> borders and tripoints
>> > >
>> > > http://www.nicolette.dk/borderbase
>> > >
>> >
>>
>>
>>
>>
>>
>>
>> _____
>>
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