OSGB 1936 / British National Grid and Local ortho height

Orbit supports the OSGB 1936 / British National Grid as described by the Ordnance Survey. Both OSTN02 XY and OSGM02 Z grid corrections are implemented.

Projected CRS

• 27700 : OSGB 1936 / British National Grid

Vertical CRS

• 5701 : ODN height
• 5740 : ODN Orkney height
• 5741 : Fair Isle height
• 5742 : Lerwick height
• 5743 : Foula height
• 5744 : Sule Skerry height
• 5745 : North Rona height
• 5746 : Stornoway height
• 5747 : St Kilda height
• 5748 : Flannan Isles height
• 5749 : St Marys height
• 5750 : Douglas height

To use this implementation as defined by the Ordnance Survey :

• Download : ostn02_osgm02_gb.zip (22MB)
• Unzip and Copy to : <Orbit installation directory>/program/system/crs

• Coordinate Reference Systems in Orbit
• http://www.ordnancesurvey.co.uk (technical specifications about coordinate system)