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<p>Hi Jordaan and list,</p>
<p>I found that one of the "best" coordinate conversion tools is at
<a class="moz-txt-link-freetext" href="https://twcc.fr/en/#">https://twcc.fr/en/#</a> where you can convert them manually or from a
CSV. It also gives you the option of checking if you are in the
right place with different background maps. You can then use the
converted list to plot the points in QGIS.<br>
</p>
<p>Regards</p>
<p>Immo<br>
</p>
<div class="moz-cite-prefix">On 2024/04/02 11:34, Jordaan Fouche via
qgis-za-user wrote:<br>
</div>
<blockquote type="cite"
cite="mid:01ac01da84e0$e63e8a50$b2bb9ef0$@gmail.com">
<pre class="moz-quote-pre" wrap="">Thank you Ryk
Could you please attach the spreadsheet.
I have learnt by now that if I flip the X,Y coordinates and then use EPSG
22287 in QGIS, I land up in the correct area (more or less on the correct
farm). That solution I have learnt from the PlanetGIS documentation. An
error of 300m should be acceptable for my purpose (for now).
Best regards
Jordaan Fouche
Portion 11
Van Reenen Country Estate
Van Reenen
3372
Republic of South Africa
Tel: +27 (0)82 555 4227
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Today's Topics:
1. Re: Coordinate conversion from Cape Datum Lo27? to EGS 84
(Ryk Taljaard)
----------------------------------------------------------------------
Message: 1
Date: Tue, 2 Apr 2024 10:32:58 +0200
From: "Ryk Taljaard" <a class="moz-txt-link-rfc2396E" href="mailto:ryk@boundaryhunter.co.za"><ryk@boundaryhunter.co.za></a>
To: "'South Africa QGIS user group'" <a class="moz-txt-link-rfc2396E" href="mailto:qgis-za-user@lists.osgeo.org"><qgis-za-user@lists.osgeo.org></a>
Subject: Re: [QGIS-ZA-user] Coordinate conversion from Cape Datum
Lo27? to EGS 84
Message-ID: <a class="moz-txt-link-rfc2396E" href="mailto:00be01da84d8$5e964640$1bc2d2c0$@co.za"><00be01da84d8$5e964640$1bc2d2c0$@co.za></a>
Content-Type: text/plain; charset="utf-8"
I use the attached spreadsheet for calculation of CAPE to WGS84
transformation of coordinate values, for data obtained from specific SG
diagrams.
TRIG 1 is the trig beacon closest to the study area and the resulting values
used for the relevant transformation calculation.
TRIG 2 is 2nd closest to the study are and used only for indication of any
possible gross error.
Take note of:
(1) The pos/neg switch of coordinate values required for GIS purposes and
(2) Beware of the study area, TRIG1 and TRIG2 being located in different
LO-systems.
Mowbray makes available the localities of all TRIG beacons in KML format, as
well as the coordinates of all TRIG beacons in both Clarke1880 and WGS84 in
TXT format, to use as input to the attached spreadsheet.
Best regards
Ryk Taljaard
Boundary Hunter
Mobile: 082 895 2906
1 Joerning Street * Paarl * 7646 * SOUTH AFRICA
Web: <a class="moz-txt-link-rfc2396E" href="http://www.boundaryhunter.co.za/"><http://www.boundaryhunter.co.za/></a> <a class="moz-txt-link-abbreviated" href="http://www.boundaryhunter.co.za">www.boundaryhunter.co.za</a> * Email:
<a class="moz-txt-link-rfc2396E" href="mailto:ryk@boundaryhunter.co.za"><mailto:ryk@boundaryhunter.co.za></a> <a class="moz-txt-link-abbreviated" href="mailto:ryk@boundaryhunter.co.za">ryk@boundaryhunter.co.za</a>
From: qgis-za-user [<a class="moz-txt-link-freetext" href="mailto:qgis-za-user-bounces@lists.osgeo.org">mailto:qgis-za-user-bounces@lists.osgeo.org</a>] On Behalf
Of Gavin Fleming via qgis-za-user
Sent: Tuesday, 02 April 2024 09:51
To: South Africa QGIS user group
Cc: Gavin Fleming
Subject: Re: [QGIS-ZA-user] Coordinate conversion from Cape Datum Lo27? to
EGS 84
Hi Jordan and thanks FC
I?m not sure how FC did the projection / transformation but you can use
QGIS, proj or a number of other tools.
An issue to be aware of is that no GIS will do an accurate datum
transformation from Cape to WGS84/Hartebeeshoek94 since there are different
errors all over the country, as much as 300m. If you need accuracy, rather
speak to a land surveyor, who can do a local transformation taking into
account the known errors.
Gavin
On 22 Mar 2024, at 09:25, Jordaan Fouche via qgis-za-user
<a class="moz-txt-link-rfc2396E" href="mailto:qgis-za-user@lists.osgeo.org"><qgis-za-user@lists.osgeo.org></a> wrote:
Thank you FC, what software did you use to do the transformation?
Could you explain in a bit more detail?
Jordaan Fouche
Portion 11
Van Reenen Country Estate
Van Reenen
3372
Republic of South Africa
Tel: +27 (0)82 555 4227
From: FC Basson <a class="moz-txt-link-rfc2396E" href="mailto:FC.Basson@westerncape.gov.za"><FC.Basson@westerncape.gov.za></a>
Sent: Thursday, March 21, 2024 8:26 PM
To: <a class="moz-txt-link-abbreviated" href="mailto:qgis-za-user@lists.osgeo.org">qgis-za-user@lists.osgeo.org</a>
Cc: <a class="moz-txt-link-abbreviated" href="mailto:j.fouche9@gmail.com">j.fouche9@gmail.com</a>
Subject: Re: [QGIS-ZA-user] Coordinate conversion from Cape Datum Lo27? to
EGS 84
Just a slight edit to the Google Maps link:
<a class="moz-txt-link-freetext" href="https://maps.app.goo.gl/VVS9XDfhjp88dXw97">https://maps.app.goo.gl/VVS9XDfhjp88dXw97</a>
And if you prefer OSM:
<a class="moz-txt-link-freetext" href="https://www.openstreetmap.org/?mlat=-26.82808180999955">https://www.openstreetmap.org/?mlat=-26.82808180999955</a>
<a class="moz-txt-link-rfc2396E" href="https://www.openstreetmap.org/?mlat=-26.82808180999955&mlon=28.591287809999518#map=12/-26.8281/28.5913"><https://www.openstreetmap.org/?mlat=-26.82808180999955&mlon=28.591287809999
518#map=12/-26.8281/28.5913></a>
&mlon=28.591287809999518#map=12/-26.8281/28.5913
_____
From: qgis-za-user <a class="moz-txt-link-rfc2396E" href="mailto:qgis-za-user-bounces@lists.osgeo.org"><qgis-za-user-bounces@lists.osgeo.org></a> on behalf of FC
Basson via qgis-za-user <a class="moz-txt-link-rfc2396E" href="mailto:qgis-za-user@lists.osgeo.org"><qgis-za-user@lists.osgeo.org></a>
Sent: 21 March 2024 20:09
To: <a class="moz-txt-link-abbreviated" href="mailto:qgis-za-user@lists.osgeo.org">qgis-za-user@lists.osgeo.org</a> <a class="moz-txt-link-rfc2396E" href="mailto:qgis-za-user@lists.osgeo.org"><qgis-za-user@lists.osgeo.org></a>
Cc: FC Basson <a class="moz-txt-link-rfc2396E" href="mailto:FC.Basson@westerncape.gov.za"><FC.Basson@westerncape.gov.za></a>; <a class="moz-txt-link-abbreviated" href="mailto:j.fouche9@gmail.com">j.fouche9@gmail.com</a>
<a class="moz-txt-link-rfc2396E" href="mailto:j.fouche9@gmail.com"><j.fouche9@gmail.com></a>
Subject: Re: [QGIS-ZA-user] Coordinate conversion from Cape Datum Lo27? to
EGS 84
I was able to locate the farm and can confirm that the coordinate should be
in LO 29.
<image001.png>
For GIS purposes, we use the rotated coordinate system, so the coordinates
should be X: -40600, Y: -2968350, which converts to geographic coordinate of
Lat: -26.828082, Lon: 28.591288, if you assume the input datum is Cape. And
here is a link to the location in Google Maps:
<a class="moz-txt-link-freetext" href="https://maps.app.goo.gl/bEwU4pMa35Db2gpNA">https://maps.app.goo.gl/bEwU4pMa35Db2gpNA</a>
Regards
FC Basson
_____
From: qgis-za-user <a class="moz-txt-link-rfc2396E" href="mailto:qgis-za-user-bounces@lists.osgeo.org"><qgis-za-user-bounces@lists.osgeo.org></a> on behalf of
Jordaan Fouche via qgis-za-user <a class="moz-txt-link-rfc2396E" href="mailto:qgis-za-user@lists.osgeo.org"><qgis-za-user@lists.osgeo.org></a>
Sent: 21 March 2024 17:14
To: <a class="moz-txt-link-abbreviated" href="mailto:qgis-za-user@lists.osgeo.org">qgis-za-user@lists.osgeo.org</a> <a class="moz-txt-link-rfc2396E" href="mailto:qgis-za-user@lists.osgeo.org"><qgis-za-user@lists.osgeo.org></a>
Cc: <a class="moz-txt-link-abbreviated" href="mailto:j.fouche9@gmail.com">j.fouche9@gmail.com</a> <a class="moz-txt-link-rfc2396E" href="mailto:j.fouche9@gmail.com"><j.fouche9@gmail.com></a>
Subject: [QGIS-ZA-user] Coordinate conversion from Cape Datum Lo27? to EGS
84
Have a set of old borehole data that I wish to plot in QGIS.
They were clearly drilled pre 1994 (Hartebeesthoek) and I am really
struggling to plot them on QGIS. I suspect they may be Cape Datum.
The example that I am including is on the farm Rietvley 600 in the Balfour
district.
The coordinates are legible as X:2968350;Y: 40600.
Can somebody please help me.
Jordaan Fouche
Portion 11
Van Reenen Country Estate
Van Reenen
3372
Republic of South Africa
Tel: +27 (0)82 555 4227
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