Transformation of WGS84 to local datum
WGS84 to anumber of local datums. A standard
Helmert 7 parameter transformation is used, with
the parameters taken from the document NATO_DT.pdf.
It is easy to add any further datums if required.
First fill in the local geographics in the form degrees, minutes, and seconds. Alternatively you can fill in the decimal degrees, e.g. 51.234567. Note that latitudes south and longitudes west should be entered as negative numbers in this latter case. Then enter the height above the datum in metres, if known. Select your local datum from the drop down box halfway down the screen. Click the appropriate 'Calculate' button to the right of the entered latitude and longitude.
The accuracy of the results will vary, depending how closely the local datum relates to the ellipsoid on which it is based. For example, the UK OSGB36 datum transformation should be within 4 metres in any direction. The errors appropriate to each datum are shown in the NATO document.
Note that the height fields represent the height above the datums ellipsoid, not above sea level. the Cartesian results are measured in metres. All of these figures are also rounded to two decimal places.
16th December 2005 modified 4th February 2014 and 23rd November 2017