[OSGeo Africa] Kathu Coordinate System

[Frank Sokolic]

Hi Hanlie,

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.

Regards, Frank.

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. [1]
>
> 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
> mystery.
>
> Cheers
> Hanlie
>
> [1]: 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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