Space-Derived Geoid Maps of Great Britain

Olliver, J. G.

doi:10.1179/sre.1992.31.244.310

Cited by 6 publications

(11 citation statements)

References 4 publications

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“…The International Terrestrial Reference Frame (ITRF) coordinates at the Herstmonceux satellite laser ranging station provided absolute control on this geoid-type model. A subsequent least-squares network adjustment [56] estimated the standard errors in the GPS-derived ellipsoidal heights to be 4cm. The standard error of the ODN heights is estimated to be between 3cm and 30cm [56].…”

Section: Geoid Models Derived From Gps and Levellingmentioning

confidence: 99%

“…A subsequent least-squares network adjustment [56] estimated the standard errors in the GPS-derived ellipsoidal heights to be 4cm. The standard error of the ODN heights is estimated to be between 3cm and 30cm [56]. As for the astrogeodetic geoid models, the 54 GPS-derived geoid-type heights available in 1991 cannot define the shortwavelength components.…”

Section: Geoid Models Derived From Gps and Levellingmentioning

confidence: 99%

“…It comprises 43 observed vertical deflections with reference to the OSGB36 horizontal datum. By 1975, a further 149 deflections had been added to create a network spanning the entire British mainland (Figure 4 in [56]). These data were subsequently used to establish the 1977 astrogeodetic geoid of Britain with reference to the OSGB70(SN) horizontal datum [7].…”

Section: Astrogeodetically Determined Geoid Modelsmentioning

confidence: 99%

“…Olliver [56] used these 54 GPS and ODN heights to geometrically derive a geoidtype surface of the British mainland with respect to the WGS84 ellipsoid. The International Terrestrial Reference Frame (ITRF) coordinates at the Herstmonceux satellite laser ranging station provided absolute control on this geoid-type model.…”

Section: Geoid Models Derived From Gps and Levellingmentioning

confidence: 99%

“…Olliver [56] transformed the OSGB70(SN) horizontal coordinates of these astrogeodetic stations to a geocentric datum to yield an astrogeodetically derived geoid with respect to the WGS84 ellipsoid. However, the 192 vertical deflections that were used cannot represent the short wavelength undulations in the geoid, and are subject to other errors (eg.…”

Section: Astrogeodetically Determined Geoid Modelsmentioning

confidence: 99%

See 4 more Smart Citations

A Review of Geoid Models Over the British Isles: Progress and Proposals

Featherstone¹,

Olliver²

2001

Survey Review

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Section: Geoid Models Derived From Gps and Levellingmentioning

confidence: 99%

Section: Geoid Models Derived From Gps and Levellingmentioning

confidence: 99%

Section: Astrogeodetically Determined Geoid Modelsmentioning

confidence: 99%

Section: Geoid Models Derived From Gps and Levellingmentioning

confidence: 99%

Section: Astrogeodetically Determined Geoid Modelsmentioning

confidence: 99%

See 3 more Smart Citations

A Review of Geoid Models Over the British Isles: Progress and Proposals

Featherstone¹,

Olliver²

2001

Survey Review

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The apparent British sea slope is caused by systematic errors in the levelling-based vertical datum

Penna

Featherstone

Gazeaux

et al. 2013

Geophysical Journal International

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The spirit-levelling-based British vertical datum (Ordnance Datum Newlyn) implies a southnorth apparent slope in mean sea level of up to 53 mm deg -1 latitude, due to the datum falling on heading northwards. Although this apparent slope has been investigated since the 1960s, explanations of its origin have remained inconclusive. It has also been suggested that, rather than a slope, the British vertical datum includes a step of about 240 mm affecting all sites north of about 53 • N. In either case, the British vertical datum may be of limited use for any study requiring accurate heights or changes in heights, such as testing geoid models, groundwater and hydrocarbon extraction, the calibration and validation of satellite-based digital terrain models, and the unification of vertical datums internationally. Within the last decade, however, based on an apparent reduction in the slope to only −12 mm deg -1 latitude with respect to recent geoid models, it has been claimed that the British vertical datum does provide a physically meaningful surface for use in scientific applications. In this paper, we reinvestigate the presence of apparent south-north sea slopes around Britain and reported slopes in the vertical datum, using the EGM2008 global gravitational model, together with mean sea level and GPS data from British tide gauges, GPS ellipsoidal heights of 178 fundamental benchmarks across mainland Britain, and vertical deflection observations at 192 stations. We demonstrate a south-north slope in the British vertical datum of −(20-25) mm deg -1 latitude with respect to both mean sea level (corrected for the ocean's mean dynamic topography and the inverse barometer response to atmospheric pressure loading) and the EGM2008 quasigeoid model, while EGM2008 is shown to exhibit a negligible slope of (2 ± 4) mm deg -1 with respect to mean sea level. It is clear, therefore, that the slope can only arise from systematic errors in the levelling, although we are unable to isolate their exact origin. Using an offset detection method based on a penalized likelihood maximization using the Schwarz Information Criterion, we do not detect a step in the vertical datum affecting all sites north of 53 • N, but do identify regional distortions that we attribute to the inhomogeneity in both the levelling data used and the least squares adjustment procedures used to realize the datum. We conclude that the British vertical datum remains unsuitable for scientific purposes.

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A Review of Geoid Models Over the British Isles: Progress and Proposals

Featherstone¹,

Olliver²

2001

Survey Review

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The history of published geoid determination for the British Isles over the last fifty years is reviewed. This includes global geopotential models, tailored geopotential models, British gravimetric geoid models, and European gravimetric geoid models that cover the British Isles. Proposals are made for a collaborative venture to produce a new geoid model using the most recent data and computational techniques.

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Space-Derived Geoid Maps of Great Britain

Cited by 6 publications

References 4 publications

A Review of Geoid Models Over the British Isles: Progress and Proposals

A Review of Geoid Models Over the British Isles: Progress and Proposals

The apparent British sea slope is caused by systematic errors in the levelling-based vertical datum

A Review of Geoid Models Over the British Isles: Progress and Proposals

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