The two AT-CH-LIs?
--- Jesper Nielsen <
jesniel@...> wrote:
> I know which two tps are the closest (not counting
> the bwnazazw mess)
>
> Jesper
> ----- Original Message -----
> From: "Lowell G. McManus" <mcmanus71496@...>
> To: "Boundary Point" <boundarypoint@yahoogroups.com>
> Sent: Wednesday, March 10, 2004 5:49 PM
> Subject: Re: [BoundaryPoint] Re: How far is it?
>
>
> > If one wanted to determine the two tripoints that
> are farthest apart, one
> should
> > first determine which few pairs are the most
> likely candidates based on
> their
> > relative antipodality from each other. This would
> take some trial and
> error.
> > However, since the antipodes of most continents
> are oceanic, there
> shouldn't be
> > an abundance of likely candidates.
> >
> > Next, the few candidates might have to be
> evaluated for the effects of the
> > spheroidicity of the earth and for elevation. The
> earth is an oblate
> spheroid,
> > bulging at the Equator and flattened at the poles.
> However, the
> difference
> > between sea level diameters pole-to-pole and
> Equator to Equator is
> typically
> > stated in the range of 40 to 43 km. The
> supposedly most precise model
> pegs the
> > figure at 42,952 meters, which is less than 27
> miles. On top of this
> distance,
> > elevation could add a few more miles if one found
> a pair of relatively
> antipodal
> > tripoints both in high mountains. Elevation would
> most affect diametric
> > distance and would be much less significant
> circumferentially.
> >
> > Considering the relative paucity of land-land
> antipodes and the relative
> paucity
> > of tripoints near the poles, the variations due to
> spheriodicity and
> elevation
> > above sea level would probably be inconsequential
> in determining the two
> most
> > interdistant tripoints.
> >
> > At http://williams.best.vwh.net/gccalc.htm , you
> will find yet another
> > great-circle distance calculator into which one
> can enter the coordinates
> of any
> > two points and get their circumferential distance
> apart. This calculator
> > differs from the others in that you can chose from
> various mathematical
> models
> > of the shape of the earth, from perfectly
> spherical through a number of
> > spheroidal models. Among these last, the one
> currently accepted is
> > WGS84/NAD83/GRS80.
> >
> > Lowell G. McManus
> > Leesville, Louisiana, USA
> >
> >
> >
> > ----- Original Message -----
> > From: "acroorca2002" <orc@...>
> > To: <BoundaryPoint@yahoogroups.com>
> > Sent: Wednesday, March 10, 2004 8:31 AM
> > Subject: [BoundaryPoint] Re: How far is it?
> >
> >
> > > really
> > > i dont remember that
> > >
> > > & it is an interesting question
> > > as well as a challenging try pointing quest
> > >
> > > perhaps even 2 of each
> > > since the farthest pair of points measured
> circumferentially
> > > might not be the same points as the
> diametrically farthest pair
> > >
> > >
> > > yet exactly how to solve for either set
> > >
> > >
> > >
> > > alternatively
> > > someone may already have solved & posted answers
> for them
> > >
> > > so perhaps a prior question is
> > > exactly how to search for any such ready made
> answers
> > >
> > >
> > > &or
> > > failing that
> > > there must be some data on the geoid already
> developed &
> > > available somewhere that might be useful toward
> these ends
> > > if we knew what to look for
> > >
> > > like
> > > greatest circumference & diameter figures might
> be a good
> > > place to start
> > > since these are likely to have been worked out
> to some degree
> > > of specificity & accuracy
> > >
> > > but where & how to find them
> > >
> > > & could we in fact approach the correct answers
> via these data
> > >
> > > & if so
> > > by exactly what means could we get there from
> here
> > >
> > >
> > >
> > > but can anyone solve or advance this
> > >
> > > or even clearly see the right way to go
> > >
> > >
> > > --- In BoundaryPoint@yahoogroups.com, "L. A.
> Nadybal"
> > > <lnadybal@c...> wrote:
> > > > We discussed some time back the maximum
> distance that any
> > > two places
> > > > on earth could be from one another.
> > > >
> > > > This site claims to deliver the distances
> between two selected
> > > points:
> > > >
> > > > www.indo.com/distance/
> > > >
> > > > LN
> > >
> > >
> > >
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> > >
> > >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
>
>
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