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Surface Slope (SGC)

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

RDF: sgc.ttl

Name

surfaceSlope

Datatype

RealInterval

Definition

The slope (rate of upward inclination of the surface from the horizontal) of the surface of a feature (for example: the terrain or a waterbody floor).

Description

The (percent) slope is determined as the change in height divided by the horizontal distance over which the change takes place, multiplied by one hundred: ((h2-h1)/d)*100. Generally the slope is determined along the primary alignment of a feature (its established direction of flow or use; for example: a road, a railway, a ridge line, and/or a bridge). In those cases where the primary alignment is essentially horizontal (for example, a beach, a watercourse bank, or a cut) the surface slope is typically determined at right angles to the primary alignment.

Accepted

2013-10-18

Defined by

DFDD

Physical quantity

pureNumber

Recommended unit

Percent (%)

Used by

• GB052 Runway Direction
• AQ140 Vehicle Lot
• ZD551 Geomorphic Break-line
• DB080 Depression
• CA020 Ridge Line
• SA050 Slope Region
• DB010 Steep Terrain Face
• BA050 Beach
• DB070 Cut
• DB071 Cut Line
• DB090 Embankment
• DB190 Volcanic Dyke
• BB082 Shoreline Ramp
• AN050 Railway Sidetrack
• AN010 Railway
• AP075 Land Transportation Way
• AQ120 Steep Grade
• AQ036 Curb
• AQ063 Causeway Structure

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