get_unique_ids(travel_data_sim)
# Starting at admin level 1
get_unique_ids(travel_data_sim, adm_start=1)
# Use numeric facto levels
get_unique_ids(travel_data_sim, name_class='numeric')
# Numeric for only the origin locations
get_unique_ids(travel_data_sim, dest=FALSE, name_class='numeric')
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