Description of Transformation - NI_IRELAND65 to ETRS89| Attribute | Entry |
|---|
| Operation identifier | NI_IRELAND65 to ETRS89 |
| Operation identifier alias |
|
| Country | Northern Ireland |
| Country identifier | NI |
| Operation valid area | Northern Ireland / Ireland |
| Operation scope | |
| Source coordinate reference system identifier | NI_IRELAND65 (X, Y, Z) |
| Target coordinate reference system identifier | ETRS89 (X, Y, Z) |
| Operation version |
|
| Operation method name | 7 parameter Helmert transformation |
| Operation method name alias | Position Vector Transformation |
| Operation method formula | Making maps compatible with GPS transformations between
the Irish Grid and the GPS Co-ordinate Reference Frame
WGS84 / ETRF89; Ordnance
Survey Ireland / Ordnance Survey of Northern Ireland, 1999
- or -
7 Parameter Helmert Transformation regarding ISO
|X| |X| |Tx| | 0 -Rz Ry | |X| |X|
|Y| = |Y| + |Ty| + | Rz 0 -Rx | * |Y| + D * |Y|
|Z| |Z| |Tz| |-Ry Rx 0 | |Z| |Z|
T S S S
T ... Target Datum
S ... Source Datum
Tx, Ty, Tz ... geocentric X/Y/Z translations [m]
Rx Ry, Rz ... rotations around X/Y/Z axis [radian]
D ... correction of scale [ppm]
REMARKS: signs of rotations in this list regarding formula
above |
| Operation method parameters number | 7 |
| Operation method remarks | designed only for use of horizontal position |
| Operation parameter name | geocentric X translation |
| Operation parameter value | +482.5 m |
| Operation parameter remarks | |
| Operation parameter name | geocentric Y translation |
| Operation parameter value | -130.6 m |
| Operation parameter remarks | |
| Operation parameter name | geocentric Z translation |
| Operation parameter value | +564.6 m |
| Operation parameter remarks | |
| Operation parameter name | |
| Operation parameter value | |
| Operation parameter remarks | |
| Operation parameter name | rotation Y-axis |
| Operation parameter value | -0.214" |
| Operation parameter remarks | to be in agreement with formulas the rotation parameter
has to be converted to Radians |
| Operation parameter name | rotation Z-axis |
| Operation parameter value | -0.631" |
| Operation parameter remarks | to be in agreement with formulas the rotation parameter
has to be converted to Radians |
| Operation parameter name | correction of scale |
| Operation parameter value | +8.15 ppm |
| Operation parameter remarks | |