Geodesy
Fundamentals Geodesy Geodynamics Geomatics History
Concepts Geographical distance Geoid Figure of the Earth (radius and circumference) Geodetic coordinates Geodetic datum Geodesic Horizontal position representation Latitude / Longitude Map projection Reference ellipsoid Satellite geodesy Spatial reference system Spatial relations Vertical positions
Technologies Global Nav. Sat. Systems (GNSSs) Global Pos. System (GPS) GLONASS (Russia) BeiDou (BDS) (China) Galileo (Europe) NAVIC (India) Quasi-Zenith Sat. Sys. (QZSS) (Japan) Discrete Global Grid and Geocoding
Standards (history) NGVD 29 Sea Level Datum 1929 OSGB36 Ordnance Survey Great Britain 1936 SK-42 Systema Koordinat 1942 goda ED50 European Datum 1950 SAD69 South American Datum 1969 GRS 80 Geodetic Reference System 1980 ISO 6709 Geographic point coord. 1983 NAD 83 North American Datum 1983 WGS 84 World Geodetic System 1984 NAVD 88 N. American Vertical Datum 1988 ETRS89 European Terrestrial Ref. Sys. 1989 GCJ-02 Chinese obfuscated datum 2002 Geo URI Internet link to a point 2010 International Terrestrial Reference System Spatial Reference System Identifier (SRID) Universal Transverse Mercator (UTM)
v t e

Jordan Transverse Mercator (JTM) (Arabic: نظام تربيع ميركاتور الأردني المستعرض) is a grid system created by the Royal Jordan Geographic Center (RJGC). This system is based on 6° belts with a Central Meridian of 37° East and a Scale Factor at Origin (mo) = 0.9998. The JTM is based on the Hayford ellipsoid adopted by the IUGG in 1924. No transformation parameters are presently offered by the government.^[1] However, Prof. Stephen H. Savage of Arizona State University provides the following parameters for the projection:

Jordan Transverse Mercator Geographic Coordinate System: GCS_International_1924 Datum: D:International_1924 Spheroid: International_1924

  Axis: 6378388
  Flattening: 297

Prime Meridian: Greenwich

  Prime Meridian Longitude: 0

Units: Degree

  Unit Scale Factor: 0.017453292519943295

Projection: Transverse Mercator

  False Easting: 500,000
  False Northing: -3,000,000
  Central Meridian: 37
  Scale Factor: 0.9998
  Central Parallel: 0

Units: Meter

  Scale Factor 1

Three-parameter transformation to WGS84 is:

  ΔX = –86 meters
  ΔY = –98 meters
  ΔZ = –119 meters

Prof. Savage also offers software, ReprojectME!, which will convert coordinates between JTM and other systems. (See http://daahl.ucsd.edu/gaialab/# for more information.)

The central meridian of 37° East is roughly midway between the extremes of Jordan: the Karameh Border Crossing with Iraq is close to 39° East, while the city of Aqaba on the Red Sea is close to 35° East.