Assessment of EGM2008 over Britain using vertical deflections, and problems with historical data

Featherstone, Will; Olliver, J. G.

doi:10.1179/1752270613y.0000000048

Cited by 8 publications

(4 citation statements)

References 28 publications

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“… The third option is to approach the transformation task as optimization problem, whereby gravity field residuals (between ITRF-transformed field observations and predictions from high-resolution models such as GGMplus, Hirt et al 2013) are minimized as a function of the transformation parameters "regional systemITRF". This idea conceptionally extends analyses of gravity field residuals done by Featherstone and Olliver (2013).  As a forth option, height residuals between ITRF-transformed BM coordinates (latitude, longitude and height) and a sufficiently high-resolution digital elevation model (DEM) could be minimized in a similar way as gravity field residuals in the previous option.…”

Section: Transformation Of Original Network Coordinates To Itrf2014mentioning

confidence: 97%

“…Because of the current political situation of Venezuela, new VD measurements cannot be expected to be taken anytime soon over the Merida Mountains, underlining the importance of reactivating already existing data. Related to our work is a study by Featherstone and Olliver (2013) who reactivated a historic VD data set over Great Britain.…”

Section: Introductionmentioning

confidence: 99%

“…For an overview on astronomical geodesy, see, e.g., Torge and Müller (2012, Chapter 5.3). Applications for astrogeodetic vertical deflections are discussed, e.g., in Jekeli (1999), Hirt et al (2010a) and Featherstone and Olliver (2013).…”

Section: Introductionmentioning

confidence: 99%

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Reactivation of the Venezuelan vertical deflection data set from classical astrogeodetic observations

Hirt

Wildermann

2018

Journal of South American Earth Sciences

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Highlights  Astrogeodetic vertical deflections (observed geoid slopes) are rare in South America  A classical vertical deflection dataset exists for Cordillera de Mérida (Venezuelan Andes)  Transformation to current reference frames to be compatible with modern geo-products  Deflections reach amplitudes of ~60 arc-seconds in this rugged mountain area  RMS-agreement of 2 arc-seconds with predictions from GGMplus. Data freely available.

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Section: Transformation Of Original Network Coordinates To Itrf2014mentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Reactivation of the Venezuelan vertical deflection data set from classical astrogeodetic observations

Hirt

Wildermann

2018

Journal of South American Earth Sciences

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“…However, the historical nature of vertical deflections makes them prone to larger uncertainty (cf. Featherstone & Olliver, 2013).…”

Section: Vertical Deflection Datamentioning

confidence: 99%

Description and release of Australian gravity field model testing data

Featherstone

Brown

McCubbine

et al. 2018

Australian Journal of Earth Sciences

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Gravimetric geoid and/or quasigeoid models are routinely evaluated using co-located GPS-levelling and/or astrogeodetic vertical deflections, globally and regionally. This short note describes these ground-truth data for Australia as of August 2017, which are provided as Electronic Supplementary Material. We provide ~7500 GPS-derived ellipsoidal heights, normal-orthometric heights from the 1971 adjustment of the Australian Height Datum, normal heights from a readjustment of levelling constrained to a model of the ocean's mean dynamic topography, and ~1000 historical astrogeodetic vertical deflections. Updates to these data will be posted on the Intergovernmental Committee on Surveying and Mapping GitHub repository (https://github.com/icsm-au), together with a readme.txt file describing them.

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