Jordan Transverse Mercator

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

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.

References

^ Grids & Datums—Hashemite Kingdom of Jordan Article by Clifford J. Mugnier, C.P., C.M.S. "Archived copy" (PDF). Archived from the original (PDF) on 2006-12-14. Retrieved 2007-02-23.{{cite web}}: CS1 maint: archived copy as title (link)