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Author Topic: Where is the geographic centre of South Africa?  (Read 12374 times)

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Offline Heimer

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Where is the geographic centre of South Africa?
« on: September 14, 2011, 10:46:19 pm »
I see on the web, Kimberley lies 58km from the geographic centre of South Africa.

Others claim it is Bloemfontein

Also - Phillipolis says they are near it

Does anybody know exactly where the spot is? Someone must have already made a rock pile...

Post picture here, please as well as the co-oprdinates. That is a cool stop-over for a leg stretch if it is accessible...

Additionally, it would be great to know the geographice centres of each of the provinces, so one can tick these off during trips.

Who can help?

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Offline Lourens ツ

Re: Where is the geographic centre of South Africa?
« Reply #1 on: September 14, 2011, 11:16:01 pm »
How would one find the geographic centre of South Africa? The crossing point between the most Northern/Southern & Eastern/Western points in SA?

That would be S27.89008 E25.62496
« Last Edit: September 14, 2011, 11:18:21 pm by Lourens dL »
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Offline KiLRoy

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Re: Where is the geographic centre of South Africa?
« Reply #2 on: September 14, 2011, 11:23:32 pm »
or when having the same square kms in each quarter?
 

Offline Pistonpete

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Re: Where is the geographic centre of South Africa?
« Reply #3 on: September 15, 2011, 07:17:13 am »
Some complex maths required. Its an uneven land mass & drawing just two lines looks wrong?
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Offline RobC

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Re: Where is the geographic centre of South Africa?
« Reply #4 on: September 15, 2011, 08:49:47 am »
Some complex maths required. Its an uneven land mass & drawing just two lines looks wrong?
Not if you calculate from the furthest points, that is the most logical. :mwink:
 

Offline Pistonpete

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Re: Where is the geographic centre of South Africa?
« Reply #5 on: September 15, 2011, 08:52:52 am »
Some complex maths required. Its an uneven land mass & drawing just two lines looks wrong?
Not if you calculate from the furthest points, that is the most logical. :mwink:
Then lines must go from other land/border extremeties. Like from EL & Katlegadi etc etc
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Offline jano

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Re: Where is the geographic centre of South Africa?
« Reply #6 on: September 15, 2011, 08:55:35 am »
It should be the COG of South Africa ;-) this would depend on whether most of SA is sitting or standing at the time ...

I would draw a horizontal line, such that the landmass of SA above and below the line are equal. Same for a vertical line, landmass on left and right equal. Where they intersect is the centre.
« Last Edit: September 15, 2011, 08:56:09 am by jano »
 

Offline RobC

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Re: Where is the geographic centre of South Africa?
« Reply #7 on: September 15, 2011, 08:55:51 am »
Some complex maths required. Its an uneven land mass & drawing just two lines looks wrong?
Not if you calculate from the furthest points, that is the most logical. :mwink:
Then lines must go from other land/border extremeties. Like from EL & Katlegadi etc etc
Look again at Lourens's points, they are the most Northern, Southern, eastern and western. Or you could do the excercise from each km along our border. I like the simple logical approach. :mwink:
 

Offline Kobus

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Re: Where is the geographic centre of South Africa?
« Reply #8 on: September 15, 2011, 10:47:08 am »
I would like to know the result of this method.

Who has some spare time?  >:D

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Offline tok-tokkie

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Re: Where is the geographic centre of South Africa?
« Reply #9 on: September 15, 2011, 10:54:58 am »
Two ways I would do it:

1. Most north & south points (west of Messina & Agulhas) add the latitude then divide by 2 to give the mean latitude.   Do same for east/west.

2. Center of Gravity method, which I prefer.  Get a map of SA & stick it to thick cardboard.  Cut around the edge of SA with an Exacto knife & cut out Lesotho so just the SA landmass remains.  Stick a pin through near Messina & pin to a vertical board, must be free to swing.  Hang a piece of cotton with small weight from pin.  Draw line where cotton thread lies.  Repeat near Richards Bay & Alexander Bay.  3 lines should cross at a point = CofG of the cardboard.
 

Offline RobC

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Re: Where is the geographic centre of South Africa?
« Reply #10 on: September 15, 2011, 10:57:02 am »
Two ways I would do it:

1. Most north & south points (west of Messina & Agulhas) add the latitude then divide by 2 to give the mean latitude.   Do same for east/west.

2. Center of Gravity method, which I prefer.  Get a map of SA & stick it to thick cardboard.  Cut around the edge of SA with an Exacto knife & cut out Lesotho so just the SA landmass remains.  Stick a pin through near Messina & pin to a vertical board, must be free to swing.  Hang a piece of cotton with small weight from pin.  Draw line where cotton thread lies.  Repeat near Richards Bay & Alexander Bay.  3 lines should cross at a point = CofG of the cardboard.
:imaposer:
I favour option 1... off to googlemaps for a while... :mwink:
 

Offline Pistonpete

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Re: Where is the geographic centre of South Africa?
« Reply #11 on: September 15, 2011, 10:59:29 am »
Two ways I would do it:

1. Most north & south points (west of Messina & Agulhas) add the latitude then divide by 2 to give the mean latitude.   Do same for east/west.

2. Center of Gravity method, which I prefer.  Get a map of SA & stick it to thick cardboard.  Cut around the edge of SA with an Exacto knife & cut out Lesotho so just the SA landmass remains.  Stick a pin through near Messina & pin to a vertical board, must be free to swing.  Hang a piece of cotton with small weight from pin.  Draw line where cotton thread lies.  Repeat near Richards Bay & Alexander Bay.  3 lines should cross at a point = CofG of the cardboard.
C'mon TT...off you go then!

Dibs on organising the first "Bash" there... >:D
« Last Edit: September 15, 2011, 11:00:40 am by Pistonpete »
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Offline Heimer

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Re: Where is the geographic centre of South Africa?
« Reply #12 on: September 15, 2011, 11:06:39 am »
There must be an accepted method. All the US states have geocaches or stone piles at their geographic centres.

That means someone somewhere must have calculated it already.

I think.....
« Last Edit: September 15, 2011, 11:07:55 am by Heimer »

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Offline RobC

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Re: Where is the geographic centre of South Africa?
« Reply #13 on: September 15, 2011, 11:11:35 am »
I see on the web, Kimberley lies 58km from the geographic centre of South Africa.

Others claim it is Bloemfontein

Also - Phillipolis says they are near it

Does anybody know exactly where the spot is? Someone must have already made a rock pile...

Post picture here, please as well as the co-oprdinates. That is a cool stop-over for a leg stretch if it is accessible...

Additionally, it would be great to know the geographice centres of each of the provinces, so one can tick these off during trips.

Who can help?
Kimberley it is!
 

Offline RobC

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Re: Where is the geographic centre of South Africa?
« Reply #14 on: September 15, 2011, 11:12:49 am »
There must be an accepted method. All the US states have geocaches or stone piles at their geographic centres.

That means someone somewhere must have calculated it already.

I think.....
Can't find any Google reference... yet
But I did draw some lines on a map... :mwink:
 

Offline DeepBass9

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Re: Where is the geographic centre of South Africa?
« Reply #15 on: September 15, 2011, 11:23:01 am »
So kimberley is the dead centre?  :laughing4:

Offline RobC

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Re: Where is the geographic centre of South Africa?
« Reply #16 on: September 15, 2011, 11:25:42 am »
So kimberley is the dead centre?  :laughing4:
Not quite, it seems to be just north of Kimberley, very close to the Vaal River...
 

Offline buzzlightyear

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Re: Where is the geographic centre of South Africa?
« Reply #17 on: September 15, 2011, 11:36:31 am »
You mean we can't have the bash in the big hole  ;D

I still think Rob rigged this to be close to him  ;D
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Offline RobC

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Re: Where is the geographic centre of South Africa?
« Reply #18 on: September 15, 2011, 11:44:45 am »
I think I found it! :deal:
 

Offline Pote

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Re: Where is the geographic centre of South Africa?
« Reply #19 on: September 15, 2011, 11:56:07 am »
I think I found it! :deal:
ok so place it in planning a ride section please