Airy 1830 ellipsoid

E486592
geodetic datum component oblate spheroid reference ellipsoid

The Airy 1830 ellipsoid is a reference ellipsoid defined in the 19th century for geodetic calculations in Great Britain, forming the basis of traditional mapping systems such as the British National Grid.

Jump to: Surface forms Statements Referenced by

Observed surface forms (1)

Surface form Occurrences
Airy 1830 1

Statements (48)

Predicate Object
instanceOf geodetic datum component ⓘ
oblate spheroid ⓘ
reference ellipsoid ⓘ
adoptedBy Ordnance Survey NERFINISHED ⓘ
authorityCode EPSG:7001 ⓘ
axisUnit metre ⓘ
basisOf British National Grid NERFINISHED ⓘ
OSGB36 datum NERFINISHED ⓘ
Ordnance Survey mapping in Great Britain NERFINISHED ⓘ
category cartography ⓘ
geodesy ⓘ
geodetic reference system ⓘ
comparedTo GRS80 ellipsoid NERFINISHED ⓘ
WGS84 ellipsoid NERFINISHED ⓘ
coordinateSystemType ellipsoidal ⓘ
datumRealization OSGB36 ⓘ
definedIn 1830 ⓘ
designedToFit geoid around Great Britain ⓘ
developedBy George Biddell Airy NERFINISHED ⓘ
flattening 0.0033408506415 ⓘ
geodeticDatumType local datum ellipsoid ⓘ
hasEccentricitySquared 0.0066705397616 ⓘ
hasParameter flattening ⓘ
semi-major axis ⓘ
semi-minor axis ⓘ
historicalStatus superseded for global positioning ⓘ
inverseFlattening 299.3249646 ⓘ
namedAfter George Biddell Airy NERFINISHED ⓘ
optimizedFor local fit to British Isles ⓘ
referenceSurfaceFor British triangulation networks ⓘ
regionOfUse Great Britain NERFINISHED ⓘ
Ireland NERFINISHED ⓘ
replacedInGlobalUseBy WGS84 ellipsoid NERFINISHED ⓘ
semiMajorAxis 6377563.396 metres ⓘ
semiMajorAxisShorterThan GRS80 ellipsoid NERFINISHED ⓘ
WGS84 ellipsoid NERFINISHED ⓘ
semiMinorAxis 6356256.909 metres ⓘ
stillUsedFor legacy mapping products ⓘ
national mapping in Great Britain ⓘ
usedFor geodetic calculations ⓘ
mapping ⓘ
surveying ⓘ
usedInCountry Ireland (historically) NERFINISHED ⓘ
United Kingdom ⓘ
usedInEpoch 19th century ⓘ
20th century ⓘ
usedWithCoordinateReferenceSystem EPSG:27700 ⓘ
usedWithProjection Transverse Mercator NERFINISHED ⓘ

Referenced by (5)

Full triples — surface form annotated when it differs from this entity's canonical label.

Airy Modified ellipsoid → basedOn → Airy 1830 ellipsoid ⓘ
Ordnance Survey National Grid (approximate) → basedOnEllipsoid → Airy 1830 ellipsoid ⓘ
subject surface form: Ordnance Survey National Grid
Ordnance Survey National Grid → ellipsoid → Airy 1830 ellipsoid ⓘ
this entity surface form: Airy 1830
Airy Modified ellipsoid → relatedTo → Airy 1830 ellipsoid ⓘ
British National Grid → usesEllipsoid → Airy 1830 ellipsoid ⓘ