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Author Topic: Where is the geographic centre of South Africa?  (Read 11489 times)

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Offline desert dueler

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Re: Where is the geographic centre of South Africa?
« Reply #40 on: September 15, 2011, 01:53:57 pm »
i will accept 1x invite for the ride to the centre and thanks  :biggrin:

 

Offline Heimer

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Re: Where is the geographic centre of South Africa?
« Reply #41 on: September 15, 2011, 01:54:55 pm »
http://thenookbnb.blogspot.com/2008/06/city-of-kimberley-northern-cape-south.html

here you go lads, there is a plaque and all:



Well Done D'Dueller - I knew it had to be somewhere.

Those co-ords go into my list of stop over places.

- Maybe Robc wants to go place a geocache there for us...

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Offline Pistonpete

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Re: Where is the geographic centre of South Africa?
« Reply #42 on: September 15, 2011, 01:56:17 pm »
Map Studio reckon its around Kimberly.
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Offline Heimer

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Re: Where is the geographic centre of South Africa?
« Reply #43 on: September 15, 2011, 01:58:28 pm »
Map Studio reckon its around Kimberly.

Yep - and now you can send them this pic and tell them exactly where.  :thumleft:  :laughing4:

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Offline Heimer

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Re: Where is the geographic centre of South Africa?
« Reply #44 on: September 15, 2011, 02:01:46 pm »
It seems to be a fairly well visited spot next to the R64 between Kimberley and Schmidts Drift
« Last Edit: September 15, 2011, 02:08:32 pm by Heimer »

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Offline Pistonpete

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Re: Where is the geographic centre of South Africa?
« Reply #45 on: September 15, 2011, 02:05:22 pm »
Map Studio reckon its around Kimberly.

Yep - and now you can send them this pic and tell them exactly where.  :thumleft:  :laughing4:
Was on it....he's going to print it & pin on the office board! ;D

Now to phone the farmer....Rob!!
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Offline RobC

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Re: Where is the geographic centre of South Africa?
« Reply #46 on: September 15, 2011, 02:18:19 pm »
Thanks... but St Lucia is not the eastern most point afaik. Can make a huge difference in the exact point! :deal:
Plus it was only calculated on one line... I want the North South vectors to be brought in to the calculation as well. >:D
I am getting pretty close... :mwink:

Voila! From my calculations it is -28.59, 24.49 or in other words Barkly West! at the end of Letetsie street! :mwink:
« Last Edit: September 15, 2011, 02:40:37 pm by RobC »
 

Offline Fudmucker

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Re: Where is the geographic centre of South Africa?
« Reply #47 on: September 15, 2011, 03:20:32 pm »
http://www.mathematische-basteleien.de/geocentre.htm

I prefer #3 as that is cartographicaly correct using longitude/latitude lines.
Wich I approximated in my map I posted.
Will do an actual check on MD's wall map in her office lunch time... :mwink:

You are not considering Marion Island and Prince Edward Island Gough Islands  - both part of South Africa and SOUTH of Agulhas
Gough is WEST of the Greenwich meridian and both are .
From a continental South African perspective, the centroid method (centre of gravity) method is best.

CORRECTION: Gough Island is a UK dependancy with a leased site for a South African Weather Station.

FYI:
Marion Island and Prince Edward Island were claimed for South Africa by a South African Navy force from the HMSAS Transvaal on 29 December 1947 and 4 January 1948 respectively. On 1 October 1948 the annexation was made official when Governor-General Gideon Brand van Zyl signed the Prince Edward Islands Act, 1948. Because the United Kingdom relinquished its claims on the islands to South Africa, no other nation has made a claim on the islands, and they have been occupied continuously since 1948 by South Africa, the status of the islands is not in dispute.

In terms of the Act, the islands fall under the jurisdiction of the Cape Town Magistrate's Court, and South African law as applied in the Western Cape applies on them. The islands are also deemed to be situated within the electoral district containing the Port of Cape Town; as of 2006[update] this is ward 55 of the City of Cape Town.
« Last Edit: September 15, 2011, 03:46:15 pm by Fudmucker »
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Offline Laban

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Re: Where is the geographic centre of South Africa?
« Reply #48 on: September 15, 2011, 03:23:14 pm »


Not even with seconds to spare!!

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Offline Trumpet

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Re: Where is the geographic centre of South Africa?
« Reply #49 on: September 15, 2011, 03:28:41 pm »
I'll check out the veracity of that board with David Morris - the current archeologist at the McGregor Museum whose a family member! However I doubt it's that wrong or that far out - all research indicates it's about 80 km from Bloem going west on the R48, so this looks to be pretty close!
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Offline RobC

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Re: Where is the geographic centre of South Africa?
« Reply #50 on: September 15, 2011, 03:35:42 pm »

You are not considering Marion Island and Gough Islands - both part of South Africa!
Gough is WEST of the Greenwich meridian and both are SOUTH of Agulhas.
From a continental South African perspective, the centroid method (centre of gravity) method is best.
Continental SA is all I am worried about... the ground we can cover on our bikes... not swim! >:D :mwink:
I find the COG method to be irrational, the center of a square/oblong makes trigonometric sense to me... ::)
 

Offline The Rock

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Re: Where is the geographic centre of South Africa?
« Reply #51 on: September 15, 2011, 03:41:02 pm »

You are not considering Marion Island and Gough Islands - both part of South Africa!
Gough is WEST of the Greenwich meridian and both are SOUTH of Agulhas.
From a continental South African perspective, the centroid method (centre of gravity) method is best.
Continental SA is all I am worried about... the ground we can cover on our bikes... not swim! >:D :mwink:
I find the COG method to be irrational, the center of a square/oblong makes trigonometric sense to me... ::)
it doesnt work like that. you are not trying to find the center of a shape that has any axis of symmetry. see post #29. SolidWorks doesn't lie!

but hey, maybe my lecturers were wrong....
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Offline RobC

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Re: Where is the geographic centre of South Africa?
« Reply #52 on: September 15, 2011, 03:46:40 pm »
but hey, maybe my lecturers were wrong....
No problem... we can visit all the points using the different calculation styles I suppose. :thumleft:
 

Offline Fudmucker

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Re: Where is the geographic centre of South Africa?
« Reply #53 on: September 15, 2011, 03:49:57 pm »

You are not considering Marion Island and Gough Islands - both part of South Africa!
Gough is WEST of the Greenwich meridian and both are SOUTH of Agulhas.
From a continental South African perspective, the centroid method (centre of gravity) method is best.
Continental SA is all I am worried about... the ground we can cover on our bikes... not swim! >:D :mwink:
I find the COG method to be irrational, the center of a square/oblong makes trigonometric sense to me... ::)

SA may be 'square', but oblong it isn't!  :mwink:
This isn't a new argument - the trig method just appears to be the simplest method working with verifiable numbers.
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Offline RobC

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Re: Where is the geographic centre of South Africa?
« Reply #54 on: September 15, 2011, 03:52:03 pm »
SA may be 'square', but oblong it isn't!  :mwink:
This isn't a new argument - the trig method just appears to be the simplest method working with verifiable numbers.

then give us your co-ordinates Yoda... ::)
 

Offline White Rhino

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Re: Where is the geographic centre of South Africa?
« Reply #55 on: September 15, 2011, 04:18:33 pm »
Cool, so the geographic centre is the midpoint between the Latitudinal Northern and Southern boundaries intersected with midpoint of the Western and Eastern Longitudinal edges of a country and not the central point of equal distribution as KillRoy suggested. I withdraw my submission for the Pulitzer  :'(

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Offline The Rock

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Re: Where is the geographic centre of South Africa?
« Reply #56 on: September 15, 2011, 04:21:45 pm »
if someone would like to visit the centroid of africa.....  :peepwall:
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Offline White Rhino

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Re: Where is the geographic centre of South Africa?
« Reply #57 on: September 15, 2011, 04:27:19 pm »
Where is that Southern Chad or Central African Republic?
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Offline Fudmucker

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Re: Where is the geographic centre of South Africa?
« Reply #58 on: September 15, 2011, 05:14:19 pm »
This just in:

"There is no such thing as the geographical center of any state, country or continent."
-Oscar S. Adams, Senior Mathematician, United States Coast and Geodetic Survey

 ???
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Offline lonerider

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Re: Where is the geographic centre of South Africa?
« Reply #59 on: September 15, 2011, 05:46:55 pm »
just to throw a cat among the pigeons:

* Has anybody considered the earth's curvature as part of determining the centre of SA? Could well be a few meters underground...

* How much will the "centre" shift by if using different map projections? (http://en.wikipedia.org/wiki/Map_projection for more info)

* Is this centre to be determined by area calculation alone, or should it include mean elevation as a weighting?

Far too many variables for one distinct anwer - Mr Adams might well be technically correct, but for places to seek, visit or explore, this dilemma is a traveller's manna! :)
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