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<DIV>Hi Hanlie</DIV>
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<DIV>The Bosman Coordinate System was used in many towns in the Northern Cape and Free State. It is not a national coordinate system. There are many with local origins.</DIV>
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<DIV>We will respond to your query and provide full background. My apologies for not responding earlier. Please feel free to email me the diagram and we will provide further advice.</DIV>
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<P style="LINE-HEIGHT: normal; MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN><FONT face=Arial><FONT size=1>Aslam Parker | Director: Geo-spatial Information and Professional Support<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></FONT></FONT></SPAN></P>
<P style="LINE-HEIGHT: normal; MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN><FONT size=1 face=Arial>|Chief Directorate: National Geo-spatial Information </FONT><A href="http://www.ngi.gov.za/"><SPAN style="COLOR: blue"><FONT size=1 face=Arial>www.ngi.gov.za</FONT></SPAN></A><FONT face=Arial><FONT size=1>|<SPAN style="COLOR: #ec7600"> <FONT color=#000000>Cape Town|</FONT></SPAN></FONT></FONT></SPAN></P>
<P style="LINE-HEIGHT: normal; MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN><FONT face=Arial><FONT size=1><FONT color=#ec7600>Tel</FONT> +27 21 658 4302|<SPAN style="COLOR: #ec7600"> Fax </SPAN>+27 86 211 7919| <SPAN style="COLOR: #ec7600">Mobile</SPAN> 082 331 8501| </FONT></FONT><A href="mailto:aparker@ruraldevelopment.gov.za"><SPAN style="COLOR: blue"><FONT size=1 face=Arial>aparker@ruraldevelopment.gov.za</FONT></SPAN></A></SPAN><U><SPAN style="FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: #ec7600; FONT-SIZE: 8pt; mso-fareast-font-family: 'Times New Roman'; mso-fareast-language: EN-ZA"><FONT size=1 face=Arial> </FONT></SPAN></U><BR>>>> Frank Sokolic <sokolic@worldonline.co.za> 2014/01/31 10:26 AM >>><BR>Hi Hanlie,<BR><BR>If the survey was done in 1968 is it not possible that the units are in <BR>Cape feet? Not sure when surveyors switched to using metres. Are you <BR>able to post a scanned copy of the survey diagram?<BR><BR>Regards, Frank.<BR><BR>On 31/01/2014 09:58, Walter Smit wrote:<BR>> OK, Gavin and I must have read the numbers too quickly...we were wrong.<BR>><BR>> I have made some enquiries and apparently the mine surveyors in the area<BR>> know of this system, but nobody is able to give its actual details. Waiting<BR>> on some more replies from surveyors, who might have more details.<BR>><BR>> Is it really necessary to convert the coordinates? Can you not rather "warp"<BR>> the diagram itself to other known boundaries? I did this pretty successfully<BR>> with diagrams from the 1830s using the georeferencing toolbar in "that other<BR>> GIS package" and shapefiles of Farm Portions from the Surveyor General.<BR>><BR>> -----Original Message-----<BR>> From: africa-bounces@lists.osgeo.org [mailto:africa-bounces@lists.osgeo.org]<BR>> On Behalf Of Walter Smit<BR>> Sent: 30 January 2014 03:00 PM<BR>> To: 'Africa local chapter discussions'<BR>> Subject: Re: [OSGeo Africa] Kathu coordinate system<BR>><BR>> I agree with Gavin...since it is from a surveyor and from pre-1999...<BR>><BR>> -----Original Message-----<BR>> From: africa-bounces@lists.osgeo.org [mailto:africa-bounces@lists.osgeo.org]<BR>> On Behalf Of Gavin Fleming<BR>> Sent: 30 January 2014 02:18 PM<BR>> To: africa@lists.osgeo.org<BR>> Subject: Re: [OSGeo Africa] Kathu coordinate system<BR>><BR>> Looks like it's south-oriented transverse mercator with a central meridian<BR>> of 23 and an offset of some nice round number > 3000000 on the SO x axis (or<BR>> a local reference latitude) and it would likely be on the Cape datum. A bit<BR>> of playing around these parameters will hopefully position it right.<BR>><BR>> Does searching on the khathu system not turn up anything?<BR>><BR>> On 30/01/2014 13:56, Hanlie Pretorius wrote:<BR>>> Hi,<BR>>><BR>>> I a hand-drawn survey diagram that I need to reproduce in QGIS. The<BR>>> area is in the Northen Cape, close to the 23° E longitude.<BR>>><BR>>> The diagram was done in 1968 and its coordinate system is specified as<BR>>> 'Kathu System'. The y coordinates are given first, are all positive<BR>>> and they range from about 23 000 to 49 000. The x coordinates are<BR>>> given second and they range from +31 000 to -153 000.<BR>>><BR>>> Can anyone tell me what the specifications for this coordinate system<BR>>> would be? I.e. the information I would need to create a WKT or proj4<BR>>> specification for the CRS.<BR>>><BR>>> Thanks<BR>>> Hanlie<BR>>> _______________________________________________<BR>>> Africa mailing list<BR>>> Africa@lists.osgeo.org<BR>>> <A href="http://lists.osgeo.org/mailman/listinfo/africa">http://lists.osgeo.org/mailman/listinfo/africa</A><BR>><BR>><BR>> --<BR>> regards<BR>><BR>> Gavin<BR>><BR>> Gavin Fleming<BR>> <A href="http://afrispatial.co.za">http://afrispatial.co.za</A><BR>> t: 0218630660<BR>> c: 0845965680<BR>> f: 0866164820<BR>><BR><BR>_______________________________________________<BR>Africa mailing list<BR>Africa@lists.osgeo.org<BR><A href="http://lists.osgeo.org/mailman/listinfo/africa">http://lists.osgeo.org/mailman/listinfo/africa</A><BR></P></DIV><BR>
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