Find datum transformation parameters

Find datum transformation parameter
Calculated datum transformation parameters	< Back \| Finish >

On this last page of the Datum transformation parameters wizard, you can view the calculated datum transformation parameters. Optionally, you can save the results as a new user-defined datum; the calculated datum parameters, which enable a transformation to the global (WGS 84) datum, are stored in the coordinate system of the first input map.

Dialog box options:

Listing of calculated datum transformation parameters:
Rotation point Xo, Yo, Zo:
	For Molodensky Badekas calculation method. The rotation center is specified in geocentric coordinates of the first point map.
Nr of points used:	For all calculation methods.
Translations dX, dY, dZ:
	For all calculation methods. Translations are calculated between the geocentric coordinates of the first and the second coordinate system, and are specified in meters.
Rotations Rot X, Rot Y, Rot Z:
	For Bursa Wolf and Molodensky Badekas calculation methods. Rotation angles are calculated between the geocentric coordinates of the first and the second coordinate system, and are specified in microradians and in arc seconds. Rot X, Rot Y and Rot Z correspond to a, b, g as mentioned on the Method page.
Scale difference dScale:
	For Bursa Wolf and Molodensky Badekas calculation methods. The scale difference is a unitless figure as 10^-6, or ppm (e.g. 1 mm per km).
Save datum parameters:
	Select this check box to save the calculated datum transformation parameters into the coordinate system of the first point map. This coordinate system will then have a user-defined datum, and will be compatible with the WGS 84 datum, and thus with any other known datum. Clear this check box if you do not wish to store the calculated transformation parameters.

When you click the Finish button while you selected the Save as check box:

The datum of the coordinate system of the first point will be adapted; the calculated datum transformation parameters will be included in this coordinate system.
The coordinate system of the first point map will then use a user-defined datum that is compatible with the WGS 84 datum, and thus with any other known datum.

Compatible with WGS 84 means: coordinates can be transformed from and to WGS 84.

By opening the coordinate system of the first point map, and clicking the Datum button, the Select datum dialog box will appear, in which you can inspect the new datum.

When you click the Finish button while you cleared the Save as check box:

The coordinate system of the first point map will not be updated.

Tip: For a general explanation of the calculation methods of the datum transformation parameters, see the Find datum transformation parameters - Method page.

References:

Bursa, M., 1966. Fundamentals of the theory of geometric satellite geodesy. Travaux de l'Institut Géophysique de l'Académie Tchécoslovaque de Sciences.
D.M.A., 1991. World Geodetic System 1984; its definition and relationships with local geodetic systems. U.S. Defense Mapping Agency, Department of Defense, Technical Report 8350.2, 2nd ed.
Kadaster - Rijksdriehoeksmeting, 2000. Het stelsel van de Rijksdriehoeksmeting en het European Terrestrial Reference System 1989; gebruik en definitie. http://www.rdnap.nl/download/rdnaptrans.pdf
Kotoglu, H.S., Mekik, C., Akcin, H., 2002. A comparison of two well known models for 7-parameter transformation. The Australian Surveyor 47(1), pp. 24-30.
Wolf, H., 1963. Geometric connection and re-orientation of three dimensional triangulation nets. Bulletin Geodesy 68, pp. 165-169.

Find datum transformation parameter

Calculated datum transformation parameters