Southern hemisphere UTM zones unaccounted for?

[acse-ra2617]

When setting up a tidal simulation and using 'thetis.coordsys.UTMCoordinateSystem()' I don't seem to be able to account for UTM zones in the southern hemisphere, by default it is set to the Northern hemisphere, leading to any transforms giving the wrong lon, lat coordinates.

Looking into the repository (https://github.com/thetisproject/thetis/blob/master/thetis/coordsys.py) line 63: 'pyproj.Proj(proj='utm', zone=utm_zone, datum='WGS84', units='m', errcheck=True)' and adding the argument 'south = True' fixed my issue for the Southern hemisphere. Some way of passing this argument as True/False would allow simulations for both hemispheres.

My apologies if I have overlooked any other already existing solutions.

[stephankramer]

Thanks Raul. Does this (#342) work for you?

[acse-ra2617]

I can confirm that works on my side. Many thanks!