def METHOD_NAME(self, num_rows, num_cols):
    geo = {
        'Grid/lon':
            xr.DataArray(DEFAULT_LON_DATA,
                         attrs={'units': 'degrees_east', },
                         dims=('lon')),
        'Grid/lat':
            xr.DataArray(DEFAULT_LAT_DATA,
                         attrs={'units': 'degrees_north', },
                         dims=('lat')),
    }
    return geo