[OSGeo Africa] Kathu Coordinate System
sokolic at worldonline.co.za
Fri Jan 31 05:56:52 PST 2014
Here's a shapefile showing some of the farms on your diagram. Maybe you
can use this to figure out the definition of the CRS.
On 31/01/2014 13:06, Hanlie Pretorius wrote:
> Hi Frank,
> I did consider that and found an article in PositionIT that discusses
> the history of the South African measurement system. 
> The SG diagram does give lengths in 'Cape Feet' and I tried the Cape
> foot conversion of 1 foot = 0.3148581 m. I converted the three points
> that interest me to metres and got the following coordinates:
> Point Y (Cape ft) X (Cape ft) Y (m) X (m)
> W 28433.9 -88109.7 8952.64373 -27742.05273
> X 23668.6 -100236.7 7452.250426 -31560.33691
> Y 28967.2 -127855.6 9120.557554 -40256.37129
> The converted coordinates still don't mean much to me, the X origin is
> definitely not at the equator.
> My client has since decided that I can just create a buffer of 31 m
> around the Eskom HV line to find the servitude, but I'm attaching the
> PDF of the diagram in case anyone is interested in solving this
> : The South African measurement system and its origin. Tomasz
> Zakiewicz, CD:NGI. PositionIT, April/May 2011.
>> Frank Sokolic <sokolic at worldonline.co.za> 2014/01/31 10:26 AM >>>
>> Hi Hanlie,
>> If the survey was done in 1968 is it not possible that the units are in
>> Cape feet? Not sure when surveyors switched to using metres. Are you
>> able to post a scanned copy of the survey diagram?
>> Regards, Frank.
>> Africa mailing list
>> Africa at lists.osgeo.org
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