# [OSGeo Africa] Units of measurement on 1946 SG diagram

Aslam Parker Aslam.Parker at drdlr.gov.za
Sun Feb 28 23:00:51 PST 2016

```FYI: Below are the official conversion factors for South Africa.

Unit (length) Equivalent
Foot = 0,304 8 m
Foot (Cape) = 0,314 858 1 m
Foot (Geoetic Cape) = 0,314 855 575 16 m
Foot (South African Geodetic) = 0,304 797 265 4 m
Inch = 0,025 4 m
Mile = 1 609,344 m
Nautical mile (International) = 1 852 m
Rood (Cape) = 3,778 297 2 m
Rood (Geodetic Cape) = 3,778 266 9 m
Yard = 0,914 4 m

Unit (area) Equivalent
Acre = 4 046,86 m2
Are = 100 m2
Hectare = 10 000 m2
Morgen = 8 565,32 m2
Square foot = 0,092 903 04 m2
Square inch = 0,000 645 16 m2
Square mile = 2 589 988 m2
Square yard = 0,836 127 36 m2

From: Africa [mailto:africa-bounces at lists.osgeo.org] On Behalf Of Norman Banks
Sent: 27 February 2016 02:36 PM
To: Africa local chapter discussions
Subject: Re: [OSGeo Africa] Units of measurement on 1946 SG diagram

Hi Hanlie

Yes, the Co-ords will also be in Cape Feet. Remember to add back the constants before you convert.

Best Regards
Norman

Norman Banks
Southern Mapping Company
On 27 Feb 2016 10:53, "Hanlie Pretorius" <hanlie.pretorius at gmail.com<mailto:hanlie.pretorius at gmail.com>> wrote:
Hi,

I have a 1946 SG diagram that states 'Cape Feet' as the unit of
measurement for its lengths, but it says 'System Lo 19°' above its
list of coordinates.

Would the coordinates therefore also be in Cape Feet?

The diagram is attached.

Thanks
Hanlie

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