x <- cbind(travel_data_sim, get_unique_ids(travel_data_sim, adm_start=2))
# Unique coordinates for all locations
get_pop_vec(x)
# Origins only
get_pop_vec(x, dest=FALSE)
# Destinations only
get_pop_vec(x, orig=FALSE)
# Without supplied ids
get_pop_vec(travel_data_sim)
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