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Adding Custom Datum to ArcGIS

Question asked by kdanaher on Sep 19, 2016
Latest reply on Sep 19, 2016 by MKennedy-esristaff

I would like to plot several coordinates that are on a datum not included in the ArcGIS coordinate system library (10.4.1 for Desktop). The datum is the Israel-Jordan Boundary Datum of 1994, which was created between the two countries in order to delimit their boundaries with accuracy and precision.

 

The technical documents submitted to the UN in regards to their boundaries define the datum very well, however there are no transformation parameters provided to get to WGS84 or any other standard. The following is an excerpt from the documents, where the datum is defined:

IJBD '94 DEFINITION

 

THE GEODETIC DATUM IJBD'94 WAS DETERMINED BY FIXING THE COORDINATES OF POINT IJBDO9 (ONE OF THE 12 DATUM POINTS), ADOPTING THE WGS'84 ELLIPSOID, AND FIXING THE REFERENCE ELLIPSOID IN THE GEOCENTER ACCORDING TO THE PRECISE GPS VECTORS WHICH WERE MEASURED BETWEEN THE 12 DATUM POINTS.

 

CONCERNING THE VERTICAL DATUM, THE JTE AGREED TO ADOPT THE ELLIPSOIDAL HEIGHTS (FOR ALL THE BOUNDARY COORDINATES) WITH REFERENCE TO THE IJBD'94 DATUM AND TO THE WGS'84 REFERENCE ELLIPSOID. THE DECISION SIMPLIFIED AND FACILITATED THE COMPUTATION SINCE ONLY ONE 3 DIMENSIONAL DATUM HAD TO BE DETERMINED. SO, NO ATTEMPT WAS MADE TO DETERMINE THE GEOID, OR, THE SEA LEVEL SURFACE AS THE DATUM OF THE VERTICAL COMPONENT OF THE COORDINATES.

 

THE COORDINATES OF POINT IJBD09 WERE COMPUTED BY AN AVERAGE BETWEEN THE RESULTS OF THE ABSOLUTE POSITIONING WHICH WAS CALCULATED BY EACH SIDE USING BROADCAST EPHEMERIS.

 

THE FOLLOWING ARE THE AGREED COORDINATES:

POINT: IJBDO9

LATITUDE: 31 45 04.37499

LONGITUDE: 35 36 13.70799

HEIGHT: -272.150 M (ELLIPSOIDAL HEIGHT)

 

THE REFERENCE ELLIPSOID PARAMETERS ARE:

ELLIPSOID: WGS84

SEMI MAJOR AXIS: 6,378,137.000 M

I/FLATTENING: 298.257223563

GM: 3986005 * 10^8 M^3 S^-2

In the document itself, there are even more details given as to the exact series of points (12) used to define the datum and their locations in terms of local settlements/cities.

 

My question is, how would I go about accurately plotting these points? I have not been able to find a way to add a custom datum to ArcMap using a custom point of origin. And even if I did, the accurate plotting of these points would only be correct relative to one another without a proper transformation to WGS84 datum or something else.

I'm attaching the treaty PDF, which is also available at the UN site.

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