[Qgis-user] Mapping in the southern hemisphere

[Agustin Lobo]

As far as I know, the letters in UTM zones have been dropped because
they were just used
to make horizontal cuts for the (paper) maps, not really for projecting,
thus your zone is 35South, the "S" refers to South, not to the zone S
in the older nomenclature.

An additional problem often found with UTM layers in the S hemisphere
is that some layers
are set as UTM North with negative coordinates, which is not correct
and used to confuse QGIS
(not sure if this problem was solved (Note: not fixed as this is not a
QGIS error but just a way to circumvent somebody else's error), we
talked about it
long time ago). A popular source of these incorrectly annotated raster layers is
http://zulu.ssc.nasa.gov/mrsid/

Agus

2011/10/20 Ramon Andiñach <custard at westnet.com.au>:
> On 20/10/2011, at 3:57, Gerhardus Geldenhuis
> <gerhardus.geldenhuis at gmail.com> wrote:
>
> Hi,
> Some feedback:
> It works brilliantly now but the path was strewn with thorns. One more
> problem of my own making was that the program that I used to convert my UTM
> UPS format into dd mm ss.ss to do the Georeferencing uses north and south
> and not + and - so I had +17 instead of -17 which also did not help. This
> thus bring me to another question is there a way to universally change the
> input method of co-ordinates within a project rather than to have to convert
> between various formats the whole time. I thought there were but setting my
> project to EPSG:32735 does not change the co-ordinate input methods for the
> GeoReferencing plugin not thus the co-ordinates displayed in the bottom of
> the screen change to UTM format.
>
> Do you mean the "on-the-fly" conversion?
> It's on the CRS tab of the project settings.
> Not sure what your rasters will do though. They sound like they might have
> +ve latitudes, in which case they probably won't plot correctly anyway.
>
> Regards
>
> 2011/10/19 Gerhardus Geldenhuis <gerhardus.geldenhuis at gmail.com>
>>
>> Sigh,
>> Thank you for all the replies. It is bloody confusing and a barrier of
>> entry to using GIS programs I think. I intent to write up my experience when
>> I am done so hopefully I can contribute in some way for the next person
>> going through this pain. It might be useful if the dialogue boxes in QGIS
>> would make no assumptions or use specific conventions and allow one to enter
>> all data or at least clearly see what assumptions are being made with
>> regards to a naming standard for a grid location.
>
> Got to make an assumption somewhere.
> The Garmin GPS I've used use this system. The Magellan's just use hemisphere
> (like QGIS).
> Personally I find the hemisphere convention much simpler to understand. For
> me the letter breakdown of zones doesn't relate to anything else, not even
> 250K map-sheets.
> -ramon.
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