Problems adding topography to ModEM model file

[florasolon]

Hello everyone,

I'm currently working with mtpy-v2 to generate model files for use with MODEM. Specifically, I'm trying to incorporate topography into my models. I've been referring to the example provided in the documentation (https://mtpy-v2.readthedocs.io/en/latest/notebooks/5_make_model_files.html), but I'm encountering some difficulties when attempting to import the Esri ASCII file.

It seems that the format of the file is correct. Here's an example:

ncols 468
nrows 455
xllcorner -49.08333333333334
yllcorner -20.46666666666667
cellsize 0.01666666666666666
NODATA -99999
283 290 307 311 326 327 338 374 354...

However, I'm receiving an error message indicating an issue with an EPSG parameter being set to None:

File ~/anaconda3/envs/mtpy/lib/python3.11/site-packages/mtpy/utils/gis_tools.py:311, in project_point(x, y, old_epsg, new_epsg)
    294 """
    295 Transform point to new EPSG
    296 
   (...)
    307 
    308 """
    310 if old_epsg is None:
--> 311     raise ValueError("Original EPSG must not be None")
    312 if new_epsg is None:
    313     raise ValueError("New EPSG must not be None")

ValueError: Original EPSG must not be None

Could anyone provide insights into how to resolve this issue? Any help would be greatly appreciated.