Built in prime meridians

Tip

Unless you are trying to work with a coordinate reference system that doesn’t exist in the built-in set, you don’t need to worry about these, the correct one will be instantiated for you.

Tip

You can access the list of supported prime meridians at runtime using PrimeMeridian::getSupportedSRIDs() or PrimeMeridian::getSupportedSRIDsWithHelp()

Athens

PrimeMeridian::fromSRID(PrimeMeridian::EPSG_ATHENS)
PrimeMeridian::fromSRID('urn:ogc:def:meridian:EPSG::8912')

Used in Greece for older mapping based on Hatt projection.

Bern

PrimeMeridian::fromSRID(PrimeMeridian::EPSG_BERN)
PrimeMeridian::fromSRID('urn:ogc:def:meridian:EPSG::8907')

1895 value. Newer value of 7°26’22.335” determined in 1938.

Bogota

PrimeMeridian::fromSRID(PrimeMeridian::EPSG_BOGOTA)
PrimeMeridian::fromSRID('urn:ogc:def:meridian:EPSG::8904')

Brussels

PrimeMeridian::fromSRID(PrimeMeridian::EPSG_BRUSSELS)
PrimeMeridian::fromSRID('urn:ogc:def:meridian:EPSG::8910')

Copenhagen

PrimeMeridian::fromSRID(PrimeMeridian::EPSG_COPENHAGEN)
PrimeMeridian::fromSRID('urn:ogc:def:meridian:EPSG::1026')

Astronomic observatory at Copenhagen Round Tower (Rundetaarn).

Ferro

PrimeMeridian::fromSRID(PrimeMeridian::EPSG_FERRO)
PrimeMeridian::fromSRID('urn:ogc:def:meridian:EPSG::8909')

El Hierro island, Canary islands, considered the most westerly point in Europe. Its longitude has had various determinations. 17°40’W of Greenwich was adopted by Austria and former Czechoslovakia, 17°39’46.02”W by former Yugoslavia.

Greenwich

PrimeMeridian::fromSRID(PrimeMeridian::EPSG_GREENWICH)
PrimeMeridian::fromSRID('urn:ogc:def:meridian:EPSG::8901')

The international reference meridian as defined first by the 1884 International Meridian Conference and later by the Bureau International de l’Heure (BIH) and then the International Earth Rotation Service (IERS).

Jakarta

PrimeMeridian::fromSRID(PrimeMeridian::EPSG_JAKARTA)
PrimeMeridian::fromSRID('urn:ogc:def:meridian:EPSG::8908')

1924 determination. Supersedes 1910 value of 106°48’37.05”E of Greenwich.

Lisbon

PrimeMeridian::fromSRID(PrimeMeridian::EPSG_LISBON)
PrimeMeridian::fromSRID('urn:ogc:def:meridian:EPSG::8902')

Madrid

PrimeMeridian::fromSRID(PrimeMeridian::EPSG_MADRID)
PrimeMeridian::fromSRID('urn:ogc:def:meridian:EPSG::8905')

Longitude has had various determinations. 3°41’14.55”W of Greenwich adopted for Spanish cartography.

Oslo

PrimeMeridian::fromSRID(PrimeMeridian::EPSG_OSLO)
PrimeMeridian::fromSRID('urn:ogc:def:meridian:EPSG::8913')

Formerly known as Kristiania or Christiania.

Paris

PrimeMeridian::fromSRID(PrimeMeridian::EPSG_PARIS)
PrimeMeridian::fromSRID('urn:ogc:def:meridian:EPSG::8903')

Conventional value of 0h 9m 20.935s = 2°20’14.025” adopted by IGN (Paris) in 1936 converted to grads. Preferred by EPSG to earlier value of 2°20’13.95” (2.596898 grads) used by RGS London (prime meridian code 8914).

Paris RGS

PrimeMeridian::fromSRID(PrimeMeridian::EPSG_PARIS_RGS)
PrimeMeridian::fromSRID('urn:ogc:def:meridian:EPSG::8914')

Value replaced by IGN (France) in 1936 - see code 8903. Equivalent to 2.596898 grads.

Rome

PrimeMeridian::fromSRID(PrimeMeridian::EPSG_ROME)
PrimeMeridian::fromSRID('urn:ogc:def:meridian:EPSG::8906')

Stockholm

PrimeMeridian::fromSRID(PrimeMeridian::EPSG_STOCKHOLM)
PrimeMeridian::fromSRID('urn:ogc:def:meridian:EPSG::8911')