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Overhead Clearance (OHC)

DGIF baseline 2026-1, the latest. Earlier baselines: timemap.

RDF: ohc.ttl

Name

overheadClearance

Datatype

Real

Definition

The least distance between the travelled way and any obstruction vertically above it.

Description

Reference STANAG 2253.

Accepted

2013-10-18

Defined by

DFDD

Physical quantity

length

Recommended unit

Metre (m)

Used by

• AT005 Cable
• AQ090 Entrance and/or Exit
• AL155 Overhead Obstruction
• AL016 Building Overhang
• DB028 Cave Chamber
• AQ113 Pipeline
• AN050 Railway Sidetrack
• AQ062 Crossing
• AQ040 Bridge
• AQ045 Bridge Span
• AQ050 Bridge Superstructure
• AL211 Transportation Route Protection Structure
• AQ130 Tunnel

Source: DGIF 2026-1 QEA model, DGIWG. Standard: DGIWG 206-3. Licence: CC BY 4.0, © DGIWG.