ETRS89-GBR [OSNet v2009] to London Survey Grid height (1)

EPSG:11008 → EPSG:10989

Coordinate Reference Systems

Source CRS

EPSG:11008

ETRS89-GBR [OSNet v2009]

Geographic 3D

Target CRS

EPSG:10989

London Survey Grid height

Vertical

Remarks

The LSGGM2025 is an adjustment to OSGM02 to account for the approximately 25mm offset between OSGM02 and OSGM15 and allow LSG heights to be derived through ETRS89-GBR [OSNet v2009]. Defines LSGH using OSNet v2009 so considered to be errorless. File LSGGM2025_W.grd covers areas west of the Greenwich meridian, with complimentary file LSGGM2025_E.grd covering east of the meridian. The full grid is available in a single file in each of Leica, Topcon and Trimble formats. For reversible alternative see ETRS89-GBR [OSNet v2009] to ETRS89-GBR [OSNet v2009] + LSG height (1), code 10998.

Frequently Asked Questions

What is the accuracy of the ETRS89-GBR [OSNet v2009] to London Survey Grid height transformation?

This is an exact transformation (EPSG:10990) with no loss of precision (0m accuracy) using the Geographic3D to GravityRelatedHeight (EGM) method. Area of use: UK - Greater London.