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<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">My apology for a late response for your invitation to attend as guest to the training workshop.
</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Unfortunately due to an extremely tight schedule with departure to German in the afternoon, I will not be able to attend.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Thanks again for the invitation</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
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<p class="MsoNormal" style="margin:0cm; margin-bottom:.0001pt"><i><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:#1F497D">Ivan Farayi Muzondo</span></i></p>
<p class="MsoNormal" style="margin:0cm; margin-bottom:.0001pt"><i><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:#1F497D">Head of Department, Geomatics</span></i></p>
<p class="MsoNormal" style="margin:0cm; margin-bottom:.0001pt"><i><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:#1F497D">Faculty of Engineering and the Built Environment</span></i></p>
<p class="MsoNormal" style="margin:0cm; margin-bottom:.0001pt"><i><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:#1F497D">Tel: (012) 382 5211/ 4918</span></i></p>
<p class="MsoNormal" style="margin:0cm; margin-bottom:.0001pt"><i><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:#1F497D">Fax: (012) 382 5214</span></i></p>
<p class="MsoNormal" style="margin:0cm; margin-bottom:.0001pt"><i><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:#1F497D">Bld 3:427</span></i></p>
<p class="MsoNormal" style="margin:0cm; margin-bottom:.0001pt"><i><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:#1F497D">Email:
<a href="mailto:JanseVanRensburgZ@tut.ac.za">Muzondoif@tut.ac.za</a></span></i></p>
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</span></b><b><span lang="EN-US" style="font-size:7.5pt; font-family:"Calibri","sans-serif"; color:green">Please consider your environmental responsibility before printing this e-mail or any other document</span></b><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"></span></p>
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<p class="MsoNormal" style="margin:0cm; margin-bottom:.0001pt"><b><span lang="EN-US" style="font-size:10.0pt; font-family:"Tahoma","sans-serif"; color:windowtext">From:</span></b><span lang="EN-US" style="font-size:10.0pt; font-family:"Tahoma","sans-serif"; color:windowtext">
africa-bounces@lists.osgeo.org [mailto:africa-bounces@lists.osgeo.org] <b>On Behalf Of
</b>Aslam Parker<br>
<b>Sent:</b> 27 August 2013 12:47 PM<br>
<b>To:</b> africa@lists.osgeo.org; newmarch@land-surveyors.com<br>
<b>Subject:</b> Re: [OSGeo Africa] Using south-orientated CRSs for GIS in South Africa</span></p>
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<p class="MsoNormal" style="margin:0cm; margin-bottom:.0001pt"><span style="font-size:10.0pt; font-family:"Segoe UI","sans-serif"">Hi All</span></p>
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<p class="MsoNormal" style="margin:0cm; margin-bottom:.0001pt"><span style="font-size:10.0pt; font-family:"Segoe UI","sans-serif"">Can we please not call it the Lo system, it is the South African Coordinate Reference System. For a detailed and authoratative
definition and explanation, please download </span></p>
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<p class="MsoNormal" style="margin:0cm; margin-bottom:.0001pt"><span style="font-size:10.0pt; font-family:"Segoe UI","sans-serif""><a href="http://www.eepublishers.co.za/images/upload/positionit_2012/SA%20Coordinate%20reference%20system%20part1+2.pdf">http://www.eepublishers.co.za/images/upload/positionit_2012/SA%20Coordinate%20reference%20system%20part1+2.pdf</a></span></p>
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<p class="MsoNormal" style="margin:0cm; margin-bottom:.0001pt"><span style="font-size:10.0pt; font-family:"Segoe UI","sans-serif"">Apparently ESRI has recently implemented the south oriented SACRS in their software.</span></p>
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<p class="MsoNormal" style="margin:0cm; margin-bottom:.0001pt"><span style="font-size:7.5pt; font-family:"Arial","sans-serif"">Aslam Parker | Director: Geo-spatial Information and Professional Support</span></p>
<p class="MsoNormal" style="margin:0cm; margin-bottom:.0001pt"><span style="font-size:7.5pt; font-family:"Arial","sans-serif"">|Chief Directorate: National Geo-spatial Information
</span><a href="http://www.ngi.gov.za/"><span style="font-size:7.5pt; font-family:"Arial","sans-serif"">www.ngi.gov.za</span></a><span style="font-size:7.5pt; font-family:"Arial","sans-serif"">|</span><span style="font-size:7.5pt; font-family:"Arial","sans-serif"; color:#EC7600"> </span><span style="font-size:7.5pt; font-family:"Arial","sans-serif"">Cape
Town|</span></p>
<p class="MsoNormal" style="margin:0cm; margin-bottom:.0001pt"><span style="font-size:7.5pt; font-family:"Arial","sans-serif"; color:#EC7600">Tel</span><span style="font-size:7.5pt; font-family:"Arial","sans-serif""> +27 21 658 4302|</span><span style="font-size:7.5pt; font-family:"Arial","sans-serif"; color:#EC7600">
Fax </span><span style="font-size:7.5pt; font-family:"Arial","sans-serif"">+27 86 211 7919|
</span><span style="font-size:7.5pt; font-family:"Arial","sans-serif"; color:#EC7600">Mobile</span><span style="font-size:7.5pt; font-family:"Arial","sans-serif""> 082 331 8501|
</span><a href="mailto:aparker@ruraldevelopment.gov.za"><span style="font-size:7.5pt; font-family:"Arial","sans-serif"">aparker@ruraldevelopment.gov.za</span></a><u><span style="font-size:7.5pt; font-family:"Arial","sans-serif"; color:#EC7600">
</span></u></p>
<p class="MsoNormal" style="margin:0cm; margin-bottom:.0001pt"> </p>
<p class="MsoNormal" style="margin:0cm; margin-bottom:.0001pt"><span style="font-size:7.5pt; font-family:"Arial","sans-serif""><img border="0" width="180" height="63" id="_x0000_i1025" src="cid:image007.png@01CEA4E0.FB35A6F0"></span></p>
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<span lang="EN-US" style="font-size:16.0pt; line-height:115%; font-family:Webdings; color:green">P</span><span lang="EN-US" style="font-size:16.0pt; line-height:115%; font-family:"Arial","sans-serif"; color:green">
</span><span lang="EN-US" style="font-size:9.0pt; line-height:115%; font-family:"Arial","sans-serif"; color:green">Please consider the environment before printing this email and/or any related attachments</span></p>
<p class="MsoNormal" style="margin:0cm; margin-bottom:.0001pt"><span style="font-size:10.0pt; font-family:"Segoe UI","sans-serif"">>>> Peter Newmarch <<a href="mailto:newmarch@land-surveyors.com">newmarch@land-surveyors.com</a>> 8/27/2013 11:42 AM >>></span></p>
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<p class="MsoNormal" style="margin:0cm; margin-bottom:.0001pt"><span style="font-size:10.0pt">If one is producing maps in a country, then its common practice to use the national mapping system of that country. So I guess NGI does have a policy in the sense
that their is a national mapping system for all data - which is the current Lo system.<br>
<br>
Peter<br>
<br>
</span><span style="font-size:10.0pt; font-family:"Segoe UI","sans-serif""></span></p>
<pre>Peter Newmarch</pre>
<pre>Professional Land Surveyor</pre>
<pre>4Y GeoInformatics Pty Ltd</pre>
<pre>Tel : +27 31 5642856</pre>
<pre>Fax : +27 31 5643074</pre>
<pre>Mobile : +27 82 5705859</pre>
<pre>eMail : <a href="mailto:newmarch@land-surveyors.com">newmarch@land-surveyors.com</a> </pre>
<p class="MsoNormal" style="margin:0cm; margin-bottom:.0001pt"><span style="font-size:10.0pt; font-family:"Segoe UI","sans-serif"">On 2013/08/27 11:18 AM, Frank Sokolic wrote:</span></p>
</div>
<blockquote style="margin-top:5.0pt; margin-bottom:5.0pt">
<p class="MsoNormal" style="margin:0cm; margin-bottom:.0001pt"><span style="font-size:10.0pt; font-family:"Segoe UI","sans-serif"">ArcGIS 10+ and the soon-to-be-released QGIS 2.0 contain the (correct) south-orientated definitions of the Lo coordinate reference
systems. However, the problem with this is that there is a HUGE amount of spatial data in SA and neighbouring countries that use a "north-facing" orientation. To convert all of this to the south-orientated system will have a massive impact on the GIS community
both in terms of money and time. Can we afford this? <br>
<br>
Does National Geo-spatial Information (NGI) have a policy on which CRS to use for GIS? They also supply spatial data using "north-orientated" coordinates so perhaps they have a policy somewhere that states:
<br>
- use south-orientated coordinates for survey data <br>
- use north-orientated coordinates for GIS data? <br>
<br>
Frank. <br>
<br>
On 26/08/2013 22:03, Gavin Fleming wrote: <br>
<br>
</span></p>
<p class="MsoNormal" style="margin:0cm; margin-bottom:.0001pt"><span style="font-size:10.0pt; font-family:"Segoe UI","sans-serif"">Very topical point Frank
<br>
<br>
Now that EPSG and proj4 have codes and implementations for the <br>
south-facing LO/Hartebeesthoek94 system, it's all well and good except <br>
as you say most GIS practitioners use north-facing, which we should not <br>
call 'LO' at all. I wish EPSG had set up the north facing series instead. <br>
<br>
If you get coordinates from a surveyor they are likely to be <br>
south-facing, otherwise not, probably because GIS has not been able to <br>
handle south-facing till recently? <br>
<br>
In my early GIS days if we got south-facing data, we'd flip it to <br>
north-facing manually before continuing. <br>
<br>
There's a bit of a blocker in QGIS 1.9 at the moment where, if you <br>
define a north-facing LO CRS (which I prefer to call something like <br>
'SouthAfricaTM19' instead of 'LO19'), it forces '+axis=wsu' into the <br>
definition, which makes it south-facing. I've filed a bug report [1] <br>
about this, hoping it gets fixed before 2.0 is released. <br>
<br>
I'm working in Lesotho now on parcel data which is in north facing TM <br>
(on the Cape datum still), though survey data comes in south-facing. The <br>
LO/Cape datum series is also in EPSG now, but also only as south-facing <br>
:-(. <br>
<br>
[1] <a href="http://hub.qgis.org/issues/8487">http://hub.qgis.org/issues/8487</a>
<br>
<br>
Gavin <br>
<br>
On 26/08/2013 17:08, Frank Sokolic wrote: <br>
<br>
</span></p>
<p class="MsoNormal" style="margin:0cm; margin-bottom:.0001pt"><span style="font-size:10.0pt; font-family:"Segoe UI","sans-serif"">Dear List,
<br>
<br>
As many of you know, the South African coordinate reference system is <br>
defined as a south-orientated system, with Westings (Y) increasing <br>
towards the south and Southings (X) increasing towards the West. <br>
However, in a GIS context I've only ever seen SA CRSs (e.g. Lo19, <br>
Lo31, etc) represented with x-coordinates increasing eastwards and <br>
y-coordinates increasing northwards. <br>
<br>
So, for example, the coordinates of the entrance to Durban harbour are <br>
represented in Hartebeesthoek94/Lo31 as <br>
Y = -5641.000 <br>
X = +3305647.886 <br>
but in practice in a GIS this point is represented as <br>
X = +5641.000 <br>
Y = -3305647.886 <br>
<br>
My question is: are there any GIS practitioners in South Africa who <br>
use the SA CRSs in the south-orientated sense? <br>
<br>
Regards, Frank. <br>
<br>
<br>
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