Verify_collections assumes the last group will be the dataset with lat and lon

[nlenssen2013]

lines 341 through 347 needs to be improved to check each group if the lat/lon variable exist. Then read in the nc group into an xarray dataset. Lat and lon var names should be defined before this code block.

with netCDF4.Dataset(subsetted_filepath) as f:
        for g in f.groups:
            ds = xarray.open_dataset(subsetted_filepath, group=g, decode_times=False)
            if len(ds.variables):
                group = g
                subsetted_ds = ds
            else:
                ds.close()

    lat_var_name, lon_var_name = get_lat_lon_var_names(subsetted_ds, collection_variables)

[nlenssen2013]

flattening variables in file is also necessary.

[jamesfwood]

Hi @nlenssen2013
Is this one still an issue? If not, can you close it?
Thanks!