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<DIV>Hi All</DIV>
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<DIV>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 </DIV>
<DIV><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></DIV>
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<DIV>Apparently ESRI has recently implemented the south oriented SACRS in their software.</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 /><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></P>
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<P style="LINE-HEIGHT: normal; MARGIN: 0cm 0cm 0pt" class=MsoNormal></SPAN></SPAN><FONT size=1 face=Arial><IMG style="WIDTH: 141px; HEIGHT: 57px" border=0 hspace=0 alt="" align=baseline src="cid:QUVDORGLNOGL.IMAGE_16.png" width=180 height=63></FONT></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal align=left><SPAN style="FONT-FAMILY: Arial; COLOR: gray; FONT-SIZE: 8pt; mso-fareast-font-family: 'Times New Roman'; mso-fareast-language: EN-US; mso-ansi-language: EN-US; mso-bidi-language: AR-SA"><SPAN style="COLOR: green; FONT-SIZE: 9pt; mso-ansi-language: EN-US" lang=EN-US><FONT face=Arial><FONT size=1><SPAN style="FONT-FAMILY: Webdings; COLOR: green; FONT-SIZE: 16pt; mso-ansi-language: EN-US" lang=EN-US>P</SPAN><SPAN style="COLOR: green; FONT-SIZE: 16pt; mso-ansi-language: EN-US" lang=EN-US> </SPAN><SPAN style="COLOR: green; FONT-SIZE: 9pt; mso-ansi-language: EN-US" lang=EN-US>Please consider the environment before printing this email and/or any related attachments</SPAN><I><SPAN style="COLOR: black; FONT-SIZE: 9pt; mso-ansi-language: EN-US" lang=EN-US><O:P></O:P></SPAN></I></FONT></FONT></P></SPAN></SPAN></SPAN></SPAN></SPAN></SPAN></SPAN>>>> Peter Newmarch <newmarch@land-surveyors.com> 8/27/2013 11:42 AM >>><BR></DIV>
<DIV class=moz-cite-prefix><FONT face="Times New Roman">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></FONT><PRE class=moz-signature cols="72">Peter Newmarch
Professional Land Surveyor
4Y GeoInformatics Pty Ltd
Tel : +27 31 5642856
Fax : +27 31 5643074
Mobile : +27 82 5705859
eMail : <A class=moz-txt-link-abbreviated href="mailto:newmarch@land-surveyors.com">newmarch@land-surveyors.com</A> </PRE>On 2013/08/27 11:18 AM, Frank Sokolic wrote:<BR></DIV>
<BLOCKQUOTE cite=mid:521C6ED6.8070306@worldonline.co.za type="cite">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>
<BLOCKQUOTE type="cite">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 class=moz-txt-link-freetext 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>
<BLOCKQUOTE type="cite">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>_______________________________________________ <BR>Africa mailing list <BR><A class=moz-txt-link-abbreviated href="mailto:Africa@lists.osgeo.org">Africa@lists.osgeo.org</A> <BR><A class=moz-txt-link-freetext href="http://lists.osgeo.org/mailman/listinfo/africa">http://lists.osgeo.org/mailman/listinfo/africa</A> <BR></BLOCKQUOTE><BR><BR></BLOCKQUOTE><BR>_______________________________________________ <BR>Africa mailing list <BR><A class=moz-txt-link-abbreviated href="mailto:Africa@lists.osgeo.org">Africa@lists.osgeo.org</A> <BR><A class=moz-txt-link-freetext href="http://lists.osgeo.org/mailman/listinfo/africa">http://lists.osgeo.org/mailman/listinfo/africa</A> <BR><BR></BLOCKQUOTE><BR><BR>
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