KeyError: 'z_min' when z_min isn't set by user in Gridder

[ahuang11]

I simply used
g = Gridder(cf_attrs)

~/OpenMosaic/src/openmosaic/gridding/gridder.py in prepare_radar_subgrids(self, radar_site_ids, radar_sites, r_max)
    409                 'dy': self.grid_params['dy'],
    410                 'ny': None,
--> 411                 'z_min': self.grid_params['z_min'],
    412                 'z_max': self.grid_params['z_max'],
    413                 'dz': self.grid_params['dz'],

KeyError: 'z_min'

[jthielen]

Correct, you need to define the grid in each dimension. Better documentation and a better error message are certainly in order here!