EPSG:10989 — London Survey Grid height

Vertical · UK - Greater London

Export Formats

WKT2

VERTCRS[
    "London Survey Grid height",
    VDATUM["London Survey Grid height datum",ID["EPSG",1423]],
    CS[vertical,1,ID["EPSG",6499]],
    AXIS["Gravity-related height (H)",up],
    LENGTHUNIT["metre",1,ID["EPSG",9001]],
    ID["EPSG",10989]
]

JSON

{
  "type": "CoordinateReferenceSystem",
  "code": 10989,
  "name": "London Survey Grid height",
  "kind": "vertical",
  "area": "UK - Greater London",
  "unit": "metre",
  "bbox": [
    51.1,
    -1.33,
    52,
    0.8
  ],
  "proj4": null
}

Related Coordinate Systems

Available Transformations (1)

Transformation	Source → Target	Accuracy (m)
ETRS89-GBR [OSNet v2009] to London Survey Grid height (1)	11008 → 10989	0

Type

Vertical

Unit

metre

Datum

London Survey Grid height datum

Area of Use

UK - Greater London

United Kingdom (UK) - Greater London and surrounding area.

Coordinate System

Vertical CS. Axis: height (H). Orientation: up. UoM: m.

WGS84 Bounds

52.00 -1.330.80 51.10

Data Source

EPSG

Information Source

Transport for London, Topographic surveys and mapping Standard S1026, issue A4, May 2025.

Revision Date

2025-10-28

Scope

Engineering survey and topographic mapping for transport applications.

Remarks

Vertical component of the London Survey Grid 2025 (LSG2025) (CRS code 11006). Prior to 2016, Ordnance Survey Geoid Model 2002 (OSGM02) plus a 100m shift could be used to produce acceptable LSGH values. In 2016, the updated Ordnance Survey Geoid Model 2015 (OSGM15) was released with an approximately 25mm height shift from OSGM02 in the London region. When using GNSS observations to derive LSGH values, OSGM15 plus a 100m shift shall not be used; instead the LSGGM2025 (code 10990) applied to OSNet v2009 (CRS code 11008) must be used.

EPSG

10989