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Author Topic: Where is the geographic centre of South Africa?  (Read 12180 times)

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Offline LeonDude

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Re: Where is the geographic centre of South Africa?
« Reply #120 on: September 29, 2011, 06:31:27 pm »
You can’t use the plumbline method for this, reason being scale. Even if you print a massive 6 x 6 meter big map of SA, if you pin it up, you would never with the eye get the position of the pin right.
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Re: Where is the geographic centre of South Africa?
« Reply #121 on: September 29, 2011, 07:16:24 pm »
Agree, you would need a precise projection of the spherical shape as a starting point making your chances of getting to a pinpoint location more of an art than a science.
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Offline Heimer

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Re: Where is the geographic centre of South Africa?
« Reply #122 on: September 29, 2011, 07:45:59 pm »
I started this thread and have seen it develop and also learned a moerse lot about how to do this geo centering.  :thumleft:

So do we have a (close to) final answer?

Because next, I would like to know the individual provinces as well.  I am itching for a senseless trip to all these waypoints. Maybe I will go plant a geocache at each...
« Last Edit: September 29, 2011, 07:47:15 pm by Heimer »

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Offline Sláinte Mhaith

Re: Where is the geographic centre of South Africa?
« Reply #123 on: September 29, 2011, 09:23:14 pm »
You can’t use the plumbline method for this, reason being scale. Even if you print a massive 6 x 6 meter big map of SA, if you pin it up, you would never with the eye get the position of the pin right.

Which position? According to the method you can pin it in any position as long as it is close to the border?

The map can rotate and will balance with half the weight on the left and half on the right of the plumb line.
 

Offline White Rhino

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Re: Where is the geographic centre of South Africa?
« Reply #124 on: September 30, 2011, 06:12:35 am »
Unless you feel nostalgic, why would you want to use paper and string when you've got Google Earth with all the spherical locating capability down to seconds (metres) ?
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Offline LeonDude

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Re: Where is the geographic centre of South Africa?
« Reply #125 on: September 30, 2011, 07:31:46 am »
You can’t use the plumbline method for this, reason being scale. Even if you print a massive 6 x 6 meter big map of SA, if you pin it up, you would never with the eye get the position of the pin right.

Which position? According to the method you can pin it in any position as long as it is close to the border?

The map can rotate and will balance with half the weight on the left and half on the right of the plumb line.
Any position, it's all about scale. If you print a map of SA on something like an A4 paper, your scale would be quite a couple of kilometers to the millimeter. The hole your pin makes would be about a millimeter. Therefore, your position would be out by many kilometers.
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Offline LeonDude

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Re: Where is the geographic centre of South Africa?
« Reply #126 on: September 30, 2011, 07:33:05 am »
These guys don’t want to know in which province or town, they want to know with accuracy as in coords. The plumb line method just cannot give you this.
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Offline Sláinte Mhaith

Re: Where is the geographic centre of South Africa?
« Reply #127 on: September 30, 2011, 08:04:46 am »
Any position, it's all about scale. If you print a map of SA on something like an A4 paper, your scale would be quite a couple of kilometers to the millimeter. The hole your pin makes would be about a millimeter. Therefore, your position would be out by many kilometers.

Aaahhh, the pinhole of the centre point. Now I understand.

The guys who could calculate it electronically lost interest in this thread.
 

Offline The Rock

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Re: Where is the geographic centre of South Africa?
« Reply #128 on: September 30, 2011, 08:06:18 am »
jislaaik! have you guys still not made up your minds?
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Offline RobC

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Re: Where is the geographic centre of South Africa?
« Reply #129 on: September 30, 2011, 08:18:35 am »
I still like the simple method I proposed... :mwink:
 

Offline White Rhino

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Re: Where is the geographic centre of South Africa?
« Reply #130 on: September 30, 2011, 02:02:13 pm »
jislaaik! have you guys still not made up your minds?

Don't be silly this is done by committee  :ricky:

Things take time - just like our government  :biggrin:
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Offline XTFREAK

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Re: Where is the geographic centre of South Africa?
« Reply #131 on: September 30, 2011, 10:46:13 pm »
Maybe we should start another thread to discuss starting a thread to find the spot?? Just asking?
 

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Re: Where is the geographic centre of South Africa?
« Reply #132 on: October 01, 2011, 02:52:00 am »
Maybe we should start another thread to discuss starting a thread to find the spot?? Just asking?
Yeah, then we can find the common spot of all of the threads to find the real thread  ;D
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Offline GRIM

Re: Where is the geographic centre of South Africa?
« Reply #133 on: October 05, 2011, 12:05:57 pm »


The guys who could calculate it electronically lost interest in this thread.

 :lamer:

Here you go...  ;D

PROVNAME   CentroidX                          CentroidY
Eastern Cape   26° 26' 46.898" E    32° 9' 14.499" S
Free State           26° 52' 2.150" E      28° 36' 51.852" S
Gauteng           28° 11' 51.183" E   26° 4' 31.572" S
KwaZulu-Natal   30° 44' 54.812" E   28° 42' 59.707" S
Mpumalanga   30° 17' 56.335" E   25° 52' 25.144" S
Northern Cape   21° 24' 10.114" E   29° 27' 12.258" S
Limpopo           29° 17' 23.148" E   23° 47' 7.207" S
North West   25° 32' 54.452" E   26° 16' 13.495" S
Western Cape   20° 36' 57.737" E   33° 0' 52.372" S
South Africa   25° 5' 38.087" E           28° 59' 43.146" S
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Offline Heimer

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Re: Where is the geographic centre of South Africa?
« Reply #134 on: October 05, 2011, 12:08:38 pm »
Grim, jou doring  :thumleft: :thumleft:

Who will be the first to visit the lot?

(If they are all accessible...  :peepwall: )

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Offline RobC

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Re: Where is the geographic centre of South Africa?
« Reply #135 on: October 05, 2011, 12:58:35 pm »
SA 25° 5' 38.087" E           28° 59' 43.146" S

Is near Paardeberg, scene of the Boer War battle. Been down that bit of dirt when I did the "Follow the river" ride. :thumleft:
 

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Re: Where is the geographic centre of South Africa?
« Reply #136 on: October 05, 2011, 01:00:08 pm »
Grim, jou doring  :thumleft: :thumleft:

Who will be the first to visit the lot?

(If they are all accessible...  :peepwall: )
Gooi the co-ord on Googlemaps... works lekker! :thumleft:
 

Offline RobC

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Re: Where is the geographic centre of South Africa?
« Reply #137 on: October 05, 2011, 01:01:08 pm »


The guys who could calculate it electronically lost interest in this thread.

 :lamer:

Here you go...  ;D

PROVNAME   CentroidX                          CentroidY
Eastern Cape   26° 26' 46.898" E    32° 9' 14.499" S
Free State           26° 52' 2.150" E      28° 36' 51.852" S
Gauteng           28° 11' 51.183" E   26° 4' 31.572" S
KwaZulu-Natal   30° 44' 54.812" E   28° 42' 59.707" S
Mpumalanga   30° 17' 56.335" E   25° 52' 25.144" S
Northern Cape   21° 24' 10.114" E   29° 27' 12.258" S
Limpopo           29° 17' 23.148" E   23° 47' 7.207" S
North West   25° 32' 54.452" E   26° 16' 13.495" S
Western Cape   20° 36' 57.737" E   33° 0' 52.372" S
South Africa   25° 5' 38.087" E           28° 59' 43.146" S

That is 10 centroids to plot and visit then! Great stuff! :thumleft:
 

Offline tok-tokkie

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Re: Where is the geographic centre of South Africa?
« Reply #138 on: October 05, 2011, 05:23:29 pm »
You can’t use the plumbline method for this, reason being scale. Even if you print a massive 6 x 6 meter big map of SA, if you pin it up, you would never with the eye get the position of the pin right.
Well the electronic version does it that way.  Gives 25°  5'    38 " E   28° 59'  43" S
Halving the lat & long extremities gives                   24°  40'  23"  E   28° 28'  45" S
Plumbline is the method I prefer.
 

Offline Lourens ツ

Re: Where is the geographic centre of South Africa?
« Reply #139 on: October 05, 2011, 05:24:44 pm »
Here are Grim's points in a gpx file.  :thumleft:
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