Coordinates

The station coordinates are available in the ITRF system and the Egyptian Transverse Mercator system.

The reference point corresponds to the antenna phase centre (L1) at the top of the pillar.

ITRF

IERS (International Earth Rotation Service) Terrestrial Reference Frame.

The ITRF is the realisation of the terrestrial reference system of IERS. The ITRS is the most precise international system, accuracy being measured in centimetres.

The associated ellipsoid is GRS80, the parameters being:

* semi-major axis: a = 6378137 m

* degree of flattening: 1/f = 298.25722210088.

 

ALEX Station 16/07/2001	ITRF Coordinates
	Geographic Coordinates			Cartesian Coordinates
	Longitude (°)	Latitude (°)	Elevation (m)	X (m)	Y (m)	Z (m)
	29°54'39,56536''	31°11'49,43277''	57,995	4733389.059	2723027,730	3284632,234

Egypt Transverse Mercator

This is the cartographic projection system used in Egypt.

Designation: EGYPT RED BELT NORTH

Country: EGYPT

Projection type: MERCATOR TRANSVERSE

Reference ellipsoid: HELMERT 1906

* semi-major axis: a = 6378200 m

* degree of flattening: 1/f = 298.300

Meridian of origin: GREENWICH

Parameters of projection definition

False Easting: X = 615000.000 m

False Northing: Y = 810000.000 m

Longitude of origin: 31° east

Latitude of origin: 30° north

Scale factor: 1

Source: IGN, service de géodésie et nivellement, 1995.

 

ALEX station 16/07/2001	Kilometric Coordinates
	X (m)		Y (m)		H (m)
	511043.566		943198.713		43.378

Click here to download permanent station coordinates.

Moving from ITRF system to Egyptian Transverse Mercator

A method of transformation, allowing the shift from the ITRF coordinates measured by the GPS to the kilometric coordinates (X, Y) and the altitude (H) of the Egyptian system, has been created by the CEAlex in the programme SKI with the interpollation method. This transformation facility has been stocked in the memory of the SKI programme (Leica).