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--></style></head><body lang="EN-US" link="#0563C1" vlink="#954F72"><div class="WordSection1"><p class="MsoNormal">Dear Colleagues,</p><p class="MsoNormal"> </p><p class="MsoNormal">A friend has asked me to produce a map using a title deed SG document. The property in question was surveyed in 1975 and it appears to make use of the LO19 coordinate system. I am not that familiar with LO19 and am having some trouble with defining a proj 4 projection in QGIS. I have produced a custom CRS based on the this post by Gavin Flemming (<a href="http://afrispatial.co.za/foss-gis/south-african-projections-in-foss-gis/">http://afrispatial.co.za/foss-gis/south-african-projections-in-foss-gis/</a>). All seems well until I look at the location, I can find it using ancillary data. The coordinates on the title deed match only in the X domain (I have swopped both the X and the Y as well as the sign) while the Y domain appears to be “way out”. The SG title deed coordinate for one of the Y points is -9105.30 (Constant +9 760 000,00) while the same location in the QGIS returns a Y coordinate of around -3 769 758. Can anyone shed light on why there is such a large difference between the SG Diagram and the actual location?</p><p class="MsoNormal"> </p><p class="MsoListParagraph" style><span style>1.<span style="font:7.0pt "Times New Roman""> </span></span>I am thinking that it might be something to do with the fact that the property was surveyed in 1975, any ideas?</p><p class="MsoListParagraph" style><span style>2.<span style="font:7.0pt "Times New Roman""> </span></span>I have used the following proj 4 definition – have I missed something?</p><p class="MsoListParagraph"> </p><p class="MsoNormal">+proj=tmerc +lat_0=0 +lon_0=19 +k=1 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs</p><p class="MsoNormal"> </p><p class="MsoNormal">Any help on this matter would be greatly appreciated.</p><p class="MsoNormal"> </p><p class="MsoNormal">Regards,</p><p class="MsoNormal">Wesley</p><p class="MsoNormal"> </p><div style="border:none;border-bottom:solid windowtext 1.5pt;padding:0in 0in 1.0pt 0in"><p class="MsoNormal" style="border:none;padding:0in"><img border="0" width="334" height="103" id="Picture_x0020_1" src="cid:image001.jpg@01CFDBF0.1B010780" alt="Email_Signature"></p></div><p class="MsoNormal">Wesley Roberts, PhD</p><p class="MsoNormal">Geospatial Manager</p><p class="MsoNormal">Biocarbon Partners</p><p class="MsoNormal"><a href="mailto:wesley@biocarbonpartners.com">wesley@biocarbonpartners.com</a></p><p class="MsoNormal">Cell RSA: +27 83 5355 646</p><p class="MsoNormal"> </p></div></body></html>