Transformations and OSGM02 user guide - Leica Geosystems

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Geoid modelA model of the level surface which is closest to mean sea level over the oceans. This surface is continued under land asthe fundamental reference surface for height measurement.GPSGlobal Positioning System – an outdoor positioning technique using a constellation of US Department of Defensesatellites and a portable receiver to dynamically determine coordinates. For high precision, several receivers are usedand their relative positions are determined.GRS80A global reference ellipsoid used in the WGS84 coordinate system. Also known as the WGS84 ellipsoid.IERSInternational Earth Rotation Service.ITRFInternational Terrestrial Reference Frame – the state-of-the-art global realisation of the WGS84 reference system, usingobservations from worldwide networks of active geodetic stations of the VLBI, SLR, GPS and DORIS techniques.ODNOrdnance Datum Newlyn – the levelling-based vertical reference frame for most of the British Isles, with a single tidegauge constraint in Newlyn in Cornwall.OSGB36Ordnance Survey Great Britain 1936 – the British horizontal mapping datum, observed by triangulation from 1936 andtraditionally realised on the ground by triangulation stations. With the release of the definitive transformation, OSTN02,OSGB36 is now realised by the ETRS89 coordinates of the National GPS Network in conjunction with the OSTN02transformation.Transformations and OSGM02 user guide appendix Dv2.1 9/2002 © crown copyrightPage 41
OSGM02Ordnance Survey National Geoid Model 2002 – a gravimetric Geoid model that is aligned with the national heightdatums of Great Britain, Northern Ireland and Ireland.OSTN02Ordnance Survey National Grid Transformation 2002 – a grid shift type horizontal transformation between the ETRS89datum and OSGB36 National Grid.realisationA spatial reference system made real on the ground by monumented points with estimated coordinates and errors.transformationA procedure to change from one coordinate system to another.WGS84World Geodetic System 1984 – the global geodetic reference system used to describe the position of GPS satellitesand ground stations.Transformations and OSGM02 user guide appendix Dv2.1 9/2002 © crown copyrightPage 42
Page 2 and 3: PrefaceThis grid transformation sof
Page 4 and 5: Data copyrightUser guide copyrightT
Page 6 and 7: Appendix A Transforming ETRS89 GPS
Page 8 and 9: Orthometric heights in these system
Page 10 and 11: ETRS89 explainedBenefitsOrdnance Su
Page 12 and 13: Chapter 2Data overviewBasic princip
Page 14 and 15: Where:1 the record number is a sequ
Page 16 and 17: Where:1 the record number is a sequ
Page 18 and 19: 4 the height of the Geoid above the
Page 20 and 21: For example, to find the record for
Page 22 and 23: Shifts for x, y are:se 0= east_shif
Page 24 and 25: The OSi/OSNI polynomial transformat
Page 26 and 27: The Ordnance Survey Geoid model: OS
Page 28 and 29: Chapter 4Quality statementCoverageO
Page 30 and 31: Appendix ATransforming ETRS89 GPS c
Page 32 and 33: The offset values are given by:dx =
Page 34 and 35: Appendix BConverting latitude and l
Page 36 and 37: ⎛ ⎛ 5 2 5 3 ⎞ ⎛2 21 3 ⎞
Page 38 and 39: Appendix CConverting easting and no
Page 40 and 41: Worked example using Airy 1830 elli

Transformations and OSGM02 user guide - Leica Geosystems

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