ZLEVEL Column

A z-level is used as a relative height measure for street links. Typically, connecting links must have the same z-level (that is, must be at the same vertical height).

The ZLEVEL column is used in an IMPORT STREETS command to set the relative height of a street link. ZLEVEL must be set to an array of z-levels, one element for every point along the link. Because z-levels are only important at terminating ends of a street link GeoBase does not consider z-levels at intermediate points of the street link. This means that only elements 0 and n-1 (for an ZLEVEL array of length n) are considered by GeoBase.

Example

IMPORT STREETS [
  ...
  ZLEVEL = array.set_at([%FROM_ZLEVEL], numpoints(%geom) - 1, %TO_ZLEVEL),
  ...
]