Height Above Surface Level (HGT)

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

Name

heightAboveSurfaceLevel

Datatype

RealInterval

Definition

The vertical distance measured from the lowest point of the base of the feature at ground or water level (downhill/downstream side) to the tallest point of the feature.

Description

For non-inland water bodies, the water level is usually understood to be Mean Sea Level (MSL). Note that the feature may be supported above the surface by another feature (for example: a tower supported by a building) and as a consequence the value of the Height Above Surface Level is different (larger) than the base-to-top height of the feature (for example: supported tower) itself.

Accepted

2013-10-18

Defined by

DFDD

Physical quantity

length

Recommended unit

Metre (m)

Used by

BC020 Buoy
BC070 Light Vessel
BC010 Maritime Navigation Beacon
BC040 Maritime Navigation Light
BC041 Maritime Navigation Light Support
BC042 Maritime Navigation Retro-reflector
BC034 Maritime Radiobeacon
GB060 Runway Radar Reflector
GB026 Transponder Landing System Station
GA033 Aeronautical Radio Navigation Installation
GB030 Helipad
GB013 Aerodrome Beacon
GB028 Aerodrome Surface Detection Station
GB027 Automated Aerodrome Weather Station
GB040 Launch Pad
AL510 Tethered Balloon
AJ090 Cattle Dipping Tank
AJ030 Holding Pen
EC010 Cane
EA020 Hedgerow
EA040 Orchard
GA215 Terminal Instrument Procedure Minima
ZB030 Boundary Monument
AL090 Grave Marker
AL180 Retail Stand
AT011 Aerial
AT005 Cable
AT041 Cableway
AT010 Dish Aerial
AB000 Disposal Site
AB010 Recycling Site
AB507 Waste Heap
AA010 Extraction Mine
AM040 Mineral Pile
AA011 Shear Wall
AA050 Well
AL018 Building Superstructure
AL010 Facility
AL014 Non-building Structure
AQ150 Stair
AL260 Wall
AL013 Building
AL016 Building Overhang
AL070 Fence
FA015 Firing Range
GB222 Low Air Maneuver Pylon
AQ117 Pump
AQ200 Regulatory Sign
AL200 Ruins
AL025 Cairn
BH075 Fountain
AK141 Statue Pedestal
AD020 Solar Panel
AK130 Racetrack
AK040 Sports Ground
AK164 Amphitheatre
AK160 Stadium
AK123 Bench
AL017 Fire Hydrant
AL073 Flagpole
AK124 Picnic Table
AK140 Planter
ZD019 Miscellaneous Feature Type
BH010 Aqueduct
BI020 Dam
BH030 Ditch
BI044 Flood Control Structure
BI030 Lock
BI031 Lock Basin
BH012 Qanat Shaft
BI006 Ship Elevator
BI040 Sluice Gate
BD100 Structural Pile
BH065 Water Race
BH180 Waterfall
AH050 Fortification
AM060 Surface Bunker
BD020 Crib
BD072 Pontoon
BB081 Shoreline Construction
BB100 Fishing Stakes
BB110 Fish Weir
BD130 Hazardous Rock
BD181 Hulk
BD180 Wreck
BG020 Tide Gauge Station
DB170 Sand Dunes
DB160 Rock Formation
DB161 Significant Rock
DB029 Cave Mouth
DB010 Steep Terrain Face
DB090 Embankment
DB100 Esker
BJ040 Ice Cliff
BJ060 Ice Peak
BJ080 Polar Ice
DB190 Volcanic Dyke
AL020 Built-up Area
AI030 Camp
BB020 Berth
BB030 Bollard
BB080 Dolphin
BB082 Shoreline Ramp
BB095 Dock
BB151 Landing Steps
BB090 Dry Dock
BB199 Floating Dry Dock
BI045 Basin Gate
BH020 Canal
AQ111 Prepared Watercourse Crossing
BH110 Penstock
AQ113 Pipeline
AL085 Standpipe
ZB036 Distance Mark
AP040 Gate
AP041 Vehicle Barrier
AQ160 Traffic Light
AQ161 Street Lamp
AQ040 Bridge
AQ056 Bridge Pier
AQ045 Bridge Span
AQ050 Bridge Superstructure
AQ055 Bridge Tower
AL211 Transportation Route Protection Structure
AQ130 Tunnel
AQ063 Causeway Structure
EB090 Shrub Land
EB020 Thicket
EE060 Bank Vegetation Zone
EC015 Forest
EC050 Grove
EC005 Tree