ring

Ring table contains data on placement of the destinations (meant as number of origin/destination computation areas) relative to origin

Field name	Field type	Description
od_start_id	INT	ID number of the origin/destination point meant as origin ex.: for intervening opportunities penetration
od_end_id	INT	ID number of the origin/destination point meant as destination ex.: for intervening opportunities penetration
ring	INT	number of ring placement of destination in relation to origin