Airborne Gravimetry for Geoid and GOCE

Forsberg, R.; Olesen, Arne Vestergaard; Nielsen, Emil Krabbe; Einarsson, I.

doi:10.1007/1345_2015_47

Cited by 4 publications

(3 citation statements)

References 12 publications

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“…This spurred new and updated GIA models for Antarctica (Whitehouse et al 2012;Ivins et al 2013;Argus et al 2014). There has been a concerted effort to fill the satellite polar gap and other regions of importance with airborne gravity data (Forsberg et al 2011(Forsberg et al , 2018.…”

Section: Mantle Geophysicsmentioning

confidence: 99%

An introduction to the geochemistry and geophysics of the Antarctic mantle

Martin

Wal

Boer

2022

Memoirs

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The Antarctic mantle, bounded between the core and the Mohorovičić discontinuity, is one of the most difficult targets of study on Earth because of ice cover and rare outcrop. A multidisciplinary approach is adopted in this volume, using petrology, geochemistry, remote sensed data and geodesy, to characterise the Antarctic mantle. This characterisation has application to rates of glacial isostatic adjustment, heat flow, sea level rise and tectonics. It places the Antarctic mantle domain in a global framework on a scale not attempted before. In this chapter we review the historical development of mantle studies in Antarctica, outline current research directions, introduce the volume chapters and provide a summary and outlook.

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Section: Mantle Geophysicsmentioning

confidence: 99%

An introduction to the geochemistry and geophysics of the Antarctic mantle

Martin

Wal

Boer

2022

Memoirs

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“…The use of the LCR gravimeter and GT-1A for airborne gravimetry has been well-documented for many years [8][9][10][11][12]. They have been improved and are now mature enough to be used in commercial fields.…”

Section: Introductionmentioning

confidence: 99%

Airborne Measurement of Earth Gravity by Comparing Three Kinds of Gravimeters

Cai,

Cao,

et al. 2023

J. Phys.: Conf. Ser.

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NUDT (National University of Defense Technology) has developed a strapdown gravimeter based on the SINS/GPS named SGA-WZ01. From April to May 2012, an airborne gravimetry flight test was carried out in the South China Sea. In this flight test, except SGA-WZ01, a 3-axis inertial platform gravimeter, GT-1A, and a damped 2-axis platform gravimeter, TAGS, were installed to obtain the gravity information. This was the first time that such a flight campaign was undertaken in China. The flight test contains one repeated line flight and four gridded line flights. The evaluation of the repeatability is based on repeated surveying lines, and the evaluation of the internal accuracy is based on all gridded lines. The results show that both GT-1A and TAGS have systematic biases about several mGal for repeated lines along west-east and northwest-southeast repeated lines, and the repeatability of SGA-WZ01 is consistent along repeated lines in different directions. The accuracy of gridded lines without crossover adjustment of GT-1A is about 1.73 mGal, while the crossover accuracy is 2.76 mGal and 2.08 mGal for TAGS and SGA-WZ01, respectively. The outcomes show that the performance of the SGA-WZ01 is comparable to that of foreign gravimeters.

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“…Furthermore, they also combined the new PolarGap gravity data with some previous gravity data sets (e.g., IceBridge, LDEO/AWI data and so on) for the GOCE polar gap region south of 82.5 • S. This final combined data set 3 (named all_sel.fa) with the accuracy of 1-5 mGal gives nearly complete coverage of the polar gap, although there are still some small gaps and inaccurate data. More detailed information about the PolarGap project and the related data sets was given by Forsberg et al (2015Forsberg et al ( , 2017.…”

Section: Introductionmentioning

confidence: 99%

Using real polar ground gravimetry data to solve the GOCE polar gap problem in satellite-only gravity field recovery

Förste

Barthelmes

et al. 2020

J Geod

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With the successful completion of European Space Agency (ESA)'s PolarGAP campaign, ground gravity data are now available for both polar regions. Therefore, it is now possible to solve the GOCE polar gap problem in satellite-only gravity field recovery by using additional polar ground gravity data instead of some regularization methods. However, ground gravimetry data need to be filtered to remove the short-wavelength information beyond a certain harmonic degree to avoid spectral leakage when inferring satellite-only gravity field models. For the Arctic, the ArcGP data set was successfully applied when inferring the high-resolution gravity field model EGM2008 which could be used for this filtering there. For Antarctica, a combination of latest airborne gravimetry data from ESA's PolarGap campaign and some previous gravity data was recently published which was irregularly distributed in space and still had some small gaps within the GOCE south polar gap. Therefore, we proposed a point mass modeling method for this filtering which was similar to the way using EGM2008 for such filtering to the ground gravity data in the Arctic. Furthermore, a variance component estimation was applied to combine the normal equations from the different sources to build a global gravity field model called IGGT_R1C. Then, this model's accuracy was evaluated by comparison with other gravity field models in terms of difference degree amplitudes, gravity anomaly differences as well as external checking by obit adjustment and gravity data in the GOCE polar gap areas. This gravity field model performed well globally according to these checking results; especially, the RMS of the residuals between the filtered gravity data and that calculated from IGGT_R1C was the smallest (2.6 mGal in the Arctic and 5.4 mGal in Antarctica) compared with that of the relevant satellite-only gravity field models, e.g., GOCO05s. Therefore, the disturbing impact of the GOCE polar data gap problem could be solved by adding the polar ground gravity data.

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Airborne Gravimetry for Geoid and GOCE

Cited by 4 publications

References 12 publications

An introduction to the geochemistry and geophysics of the Antarctic mantle

An introduction to the geochemistry and geophysics of the Antarctic mantle

Airborne Measurement of Earth Gravity by Comparing Three Kinds of Gravimeters

Using real polar ground gravimetry data to solve the GOCE polar gap problem in satellite-only gravity field recovery

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