[QGIS-ZA-user] South African CRSs in QGIS

[Immo Blecher]

Hi QGIS Users,

I can't find these in my QGIS 3.4. And I see that Proj4 is still on 
version 4.93, but the latest seems to be 5.2.

But what I also noticed is that Proj4 changed the way it converts 
from/to Hartebeesthoek94 (15 to 31) from version 4.7 to vers. 4.9: Using 
proj4 4.7 to convert one had to turn around E-W and N-S, w.o.w. X = -X 
and Y = -Y and then convert. From vers. 4.9 this was not necessary any 
longer so I think the calculations in QGIS should be sorted out (it is 
actually a bug and that is why everything is upside down and 
right=left). That would also mean that we would not need the ZANGI:ZANGI 
projections any longer but just use the built-in Hartebeesthoek94 ones.

For what it's worth!

Immo

On 2018/11/13 10:58, Frank Sokolic via qgis-za-user wrote:
> Hi QGIS users,
>
> I noticed last week that these CRSs have appeared in QGIS under 
> Project Coordinate Systems > Transverse Mercator:
>
> EPSG:102480 Hartebeesthoek94_Lo15
> EPSG:102481 Hartebeesthoek94_Lo17
> EPSG:102482 Hartebeesthoek94_Lo19
> EPSG:102483 Hartebeesthoek94_Lo21
> EPSG:102484 Hartebeesthoek94_Lo23
> EPSG:102485 Hartebeesthoek94_Lo25
> EPSG:102486 Hartebeesthoek94_Lo27
> EPSG:102487 Hartebeesthoek94_Lo29
> EPSG:102488 Hartebeesthoek94_Lo31
> EPSG:102489 Hartebeesthoek94_Lo33
> EPSG:102562 Hartebeesthoek94_Lo19_(E-N)
> EPSG:102563 Hartebeesthoek94_Lo21_(E-N)
> EPSG:102564 Hartebeesthoek94_Lo23_(E-N)
> EPSG:102565 Hartebeesthoek94_Lo25_(E-N)
> EPSG:102566 Hartebeesthoek94_Lo27_(E-N)
> EPSG:102567 Hartebeesthoek94_Lo29_(E-N)
> EPSG:102568 Hartebeesthoek94_Lo31_(E-N)
>
> Anyone know anything about them? Are these now the official South 
> African CRSs in the EPSG database? If so, where are L015_(E-N), 
> L017_(E-N) and L033_(E-N)?
>
> With these new additions, there are now a few versions of the South 
> African CRSs in the QGIS CRS database (e.g. EPSG 2046 to EPSG 2055 as 
> well as ZANGI:HBKNO15 to ZANGI:HBK033) so I guess things need to be 
> cleaned up.
>
> Regards, Frank.
>
> _______________________________________________
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> qgis-za-user at lists.osgeo.org
> https://lists.osgeo.org/mailman/listinfo/qgis-za-user
-- 

*Immo F. Blecher**
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