Converting WGS84 to UTM coordinates

[pfrollo]

I am trying to convert WGS84 coordinates to UTM however I am not getting the expected results.

Input:

• Lat: -16 degrees
• Lon: -69 degrees
• UTM zone: 19 (19S)

Expected output according to montana.edu

• Easting: 500000
• Northing: 8231065

Received output:

• Easting: 500000
• Northing: -1768935

Steps to reproduce:

~ > pip list|grep pyproj
pyproj                            3.3.1
~ > python3
Python 3.9.12 (main, May  8 2022, 18:05:28) 
[Clang 13.0.0 (clang-1300.0.29.30)] on darwin
>>> import pyproj
>>> from pyproj import Proj
>>> p = Proj(proj='utm', zone='19', ellps='WGS84', preserve_units=False)
>>> x, y = p(-69, -16)
>>> print("{} {}".format(x, y))
500000.0 -1768935.375976459

Our projects has hard limits on old versions of Python (3.6.0) and pyproj (2.4.0). I tried the same code in different versions of pyproj with the same results.

Any help is appreciated! Thank you!

[snowman2]

You need the south indicator:

 p = Proj(proj='utm', zone='19', ellps='WGS84', south=True, preserve_units=False)

[pfrollo]

Thanks! I owe you!