Illustrating 3D GIS topology issue of multiple Zs per X and Y

1. 3D GIS dilemma
Multi-Z’s per X, Y
(no violation of topology
as integrity constraint)

2. (salt domes in Natural Resources)
Shallow rights
Operator A
(X,Y,Z1) x
(X,Y,Z1) x
x (X,Y,Z2)
x (X,Y,Z2)
Operator B
Deep rights
Natural Resources: A/E/C:
Mineral leases by depths Volumes with overhangs