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.
[Grids & Datums—Hashemite Kingdom of Jordan Article by Clifford J. Mugnier, C.P., C.M.S. ] 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 37th meridian east, 37° East is roughly midway between the extremes of Jordan: the Karameh Border Crossing with Iraq is close to 39th meridian east, 39° East, while the city of Aqaba on the Red Sea is close to 35th meridian east, 35° East.
See also
* Jordan
* Mercator projection
References
External links
Jordanian Department Of Lands & Survey
Geographic coordinate systems
Geodesy
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