<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><meta name="Generator" content="Microsoft Word 15 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p
{mso-style-priority:99;
mso-margin-top-alt:auto;
margin-right:0in;
mso-margin-bottom-alt:auto;
margin-left:0in;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
p.MsoListParagraph, li.MsoListParagraph, div.MsoListParagraph
{mso-style-priority:34;
margin-top:0in;
margin-right:0in;
margin-bottom:0in;
margin-left:.5in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
span.EmailStyle18
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
/* List Definitions */
@list l0
{mso-list-id:877232093;
mso-list-type:hybrid;
mso-list-template-ids:-267062196 67698703 67698713 67698715 67698703 67698713 67698715 67698703 67698713 67698715;}
@list l0:level1
{mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level2
{mso-level-number-format:alpha-lower;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level3
{mso-level-number-format:roman-lower;
mso-level-tab-stop:none;
mso-level-number-position:right;
text-indent:-9.0pt;}
@list l0:level4
{mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level5
{mso-level-number-format:alpha-lower;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level6
{mso-level-number-format:roman-lower;
mso-level-tab-stop:none;
mso-level-number-position:right;
text-indent:-9.0pt;}
@list l0:level7
{mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level8
{mso-level-number-format:alpha-lower;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level9
{mso-level-number-format:roman-lower;
mso-level-tab-stop:none;
mso-level-number-position:right;
text-indent:-9.0pt;}
ol
{margin-bottom:0in;}
ul
{margin-bottom:0in;}
--></style></head><body lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Hi Sarel,</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Many thanks for the input. I have found the specific EPSG and as before the same location appears to have different coordinates to those specified on the surveyors diagram. I think I am missing a step here. Based on Zoltans response I think I need an intermediate step to get the points into the correct location, is this correct?</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">So, my workflow is </span></p><p class="MsoListParagraph" style><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><span style>1.<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Generate text file with X and Y coordinates</span></p><p class="MsoListParagraph" style><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><span style>2.<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Open in QGIS using delimited text file import </span></p><p class="MsoListParagraph" style><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><span style>3.<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Assign a suitable projection to the mapped points (LO19 Cape Datum)</span></p><p class="MsoListParagraph"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">………An intermediate step……… <- Think of the maths cartoon where the prof says “and then a miracle happens”</span></p><p class="MsoListParagraph" style><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><span style>4.<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Re-project to WGS 84\</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I am still lost when it comes to the north facing vs south facing projection and how I get the proj to match the coordinates on the SG diagram. Could this not al be a change in the constant?</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Regards,</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Wesley</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></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"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><img width="334" height="103" id="Picture_x0020_1" src="cid:image001.jpg@01CFDBF8.58425BF0" alt="Email_Signature"></span></p></div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Wesley Roberts, PhD</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Geospatial Manager</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Biocarbon Partners</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><a href="mailto:wesley@biocarbonpartners.com"><span style="color:#0563c1">wesley@biocarbonpartners.com</span></a></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Cell RSA: +27 83 5355 646</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <a href="mailto:africa-bounces@lists.osgeo.org">africa-bounces@lists.osgeo.org</a> [mailto:<a href="mailto:africa-bounces@lists.osgeo.org">africa-bounces@lists.osgeo.org</a>] <b>On Behalf Of </b>S Coetzer<br><b>Sent:</b> Monday, September 29, 2014 3:05 PM<br><b>To:</b> Africa local chapter discussions<br><b>Subject:</b> Re: [OSGeo Africa] Surveyor General Diagram - Mapping property boundary points</span></p><p class="MsoNormal"> </p><div><div><div><div><p class="MsoNormal" style="margin-bottom:12.0pt">Hi Wesly</p></div><p class="MsoNormal" style="margin-bottom:12.0pt">Zoltan is correct, use Cape datum for 1975 data, I think the EPSG code is: 22279</p></div><p class="MsoNormal" style="margin-bottom:12.0pt">In QGIS, use 22279 to filter your CRS and you'lle find it.</p></div><p class="MsoNormal">Good luck.</p></div><div><p class="MsoNormal"><br clear="all"></p><div><p class="MsoNormal">Sarel Coetzer </p></div><p class="MsoNormal"> </p><div><p class="MsoNormal">On Mon, Sep 29, 2014 at 2:37 PM, Dr Wesley Roberts <<a href="mailto:wesley@biocarbonpartners.com" target="_blank">wesley@biocarbonpartners.com</a>> wrote:</p><blockquote style="border:none;border-left:solid #cccccc 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in"><div><div><p class="MsoNormal" style>Dear Colleagues,</p><p class="MsoNormal" style> </p><p class="MsoNormal" style>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/" target="_blank">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" style> </p><p>1.<span style="font-size:7.0pt"> </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>2.<span style="font-size:7.0pt"> </span>I have used the following proj 4 definition – have I missed something?</p><p> </p><p class="MsoNormal" style>+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" style> </p><p class="MsoNormal" style>Any help on this matter would be greatly appreciated.</p><p class="MsoNormal" style> </p><p class="MsoNormal" style>Regards,</p><p class="MsoNormal" style>Wesley</p><p class="MsoNormal" style> </p><div style="border:none;border-bottom:solid windowtext 1.5pt;padding:0in 0in 1.0pt 0in"><p class="MsoNormal" style><img border="0" width="334" height="103" id="_x0000_i1025" src="cid:image001.jpg@01CFDBF8.58425BF0" alt="Email_Signature"></p></div><p class="MsoNormal" style>Wesley Roberts, PhD</p><p class="MsoNormal" style>Geospatial Manager</p><p class="MsoNormal" style>Biocarbon Partners</p><p class="MsoNormal" style><a href="mailto:wesley@biocarbonpartners.com" target="_blank">wesley@biocarbonpartners.com</a></p><p class="MsoNormal" style>Cell RSA: +27 83 5355 646</p><p class="MsoNormal" style> </p></div></div><p class="MsoNormal"><br>_______________________________________________<br>Africa mailing list<br><a href="mailto:Africa@lists.osgeo.org">Africa@lists.osgeo.org</a><br>You can UNSUBSCRIBE at <a href="http://lists.osgeo.org/mailman/listinfo/africa" target="_blank">http://lists.osgeo.org/mailman/listinfo/africa</a></p></blockquote></div><p class="MsoNormal"> </p></div></div></body></html>