Jordan Transverse Mercator

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:

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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.