foot
EPSG
OGP
2012-08-10
down
D
1..
Generally is a straight line through the reference surface, but there may be engineering applications where depth follows the plumb line; because of the short distances and near parallelism involved the two are considered to be insignificantly different.
Vertical CS. Axis: depth (D). Orientation: down. UoM: ft.
Distance measured perpendicular to a reference surface, positive downwards.