The AUSGeoid98 geoid model of Australia: data treatment, computations and comparisons with GPS-levelling data

Featherstone, Will; Kirby, Jonathan; Kearsley, A. H. W.; Gilliland, John; Johnston, Gary; Steed, Jim; Forsberg, R.; Sideris, Michael G.

doi:10.1007/s001900100177

Cited by 105 publications

(76 citation statements)

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“…As a case study, the system is applied to the Australian coast using two cycles (42 and 43) of ERS-2 20 Hz waveform data (March to May 1999). The SSH before and after retracking is compared with an external quasi-independent reference of the AUSGeoid98 gravimetric geoid model [Featherstone et al, 2001], which verifies the effectiveness of the system. The term quasi-independent reflects that altimeter-derived gravity anomalies were one of the data sources for this model.…”

Section: Introductionmentioning

confidence: 82%

“…The AUSGeoid98 gravimetric geoid model [Featherstone et al, 2001] was used as external ''ground truth'' for the comparisons. Waveforms were threshold-retracked using the above four schemes.…”

Section: Selection Of the Threshold Levelmentioning

confidence: 99%

“…They are the GSHHS (0.2 km resolution) shoreline model [Wessel and Smith, 1996], the Australian DEM (9 00 Â 9 00 resolution, version 2), the DS759.2 (5 0 Â 5 0 resolution) ocean depth model [Dunbar, 2000], the Australian bathymetric model (30 00 resolution) [Buchanan, 1991], and the AUSGeoid98 (2 0 Â 2 0 resolution) gravimetric geoid model [Featherstone et al, 2001]. As stated, the MDT is not applied to the SSH data in this study, so any improvement in the SSH will only be seen in the STD.…”

Section: Data and Editingmentioning

confidence: 99%

“…In order to assess the accuracy of the retracked data, and to determine how the retracked SSH profiles represent the true sea surface, an independently surveyed reference is required. The surface used is the AUSGeoid98 2 0 Â 2 0 gravimetric geoid grid [Featherstone et al, 2001]. The difference between the 20 Hz SSHs before and after retracking and corresponding bi-spline-interpolated geoid height is computed along the ground tracks.…”

Section: Evaluation Of Ssh Data Using Geoid Heightsmentioning

confidence: 99%

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A coastal retracking system for satellite radar altimeter waveforms: Application to ERS‐2 around Australia

2006

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[1] Satellite radar altimeter-derived sea surface heights (SSH) are in error in coastal regions due, in part, to the complex nature of echoes returned from rapidly varying land and sea surfaces. This paper presents improved altimeter-derived SSH results in Australian coastal regions using the waveform retracking technique, which reprocesses the waveform data through a ''coastal retracking system''. The system, based upon a systematic analysis of satellite radar altimeter waveforms around Australia, improves SSH data from several retrackers depending on the waveforms' characteristics. Central to the system is the use of two techniques: the least squares fitting and the threshold retracking algorithms. To overcome the problem of fading noise, the fitting algorithm has been developed to include a weighted iterative scheme. The retrackers include five fitting models and the threshold method with varying threshold levels. A waveform classification procedure has also been developed, which enables the waveforms to be sorted and then retracked by an appropriate retracker. Two cycles of 20-Hz waveform data from ERS-2 have been reprocessed using this system to obtain the improved SSH estimates. Using the AUSGeoid98 gravimetric geoid model as a quasi-independent reference, the system improves SSH estimates from beyond $22 km to beyond $5 km from the coastline.Citation: Deng, X., and W. E. Featherstone (2006), A coastal retracking system for satellite radar altimeter waveforms: Application

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Section: Introductionmentioning

confidence: 82%

Section: Selection Of the Threshold Levelmentioning

confidence: 99%

Section: Data and Editingmentioning

confidence: 99%

Section: Evaluation Of Ssh Data Using Geoid Heightsmentioning

confidence: 99%

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A coastal retracking system for satellite radar altimeter waveforms: Application to ERS‐2 around Australia

2006

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“…The application of local rotations and scale changes during processing was not necessary. The observed ellipsoidal heights were transformed to the Australian Height Datum 1971 (AHD71) by applying the AUSGeoid98 [9].…”

Section: Network Adjustmentmentioning

confidence: 99%

Can RTK GPS be Used to Improve Cadastral Infrastructure?

Janssen¹,

Grinter²,

Roberts³

2011

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Cadastral surveying is concerned with the process of gathering evidence in the form of position information that is used to define the location of objects or land boundaries for the purposes of identifying ownership and/or the value of land parcels. The advent of Global Navigation Satellite Systems (GNSS), such as the Global Positioning System (GPS), has revolutionised the way 3-dimensional positions are determined and GPS surveying techniques, particularly Real Time Kinematic (RTK), are increasingly being adopted by cadastral surveyors. This paper presents a methodology for using RTK GPS observations to improve the existing cadastral survey control infrastructure, based on an extensive survey carried out in New South Wales, Australia. It is shown that accuracies (RMS) of 11 mm in the horizontal and 34 mm in the vertical component (1) can be achieved for this dataset. Calculated bearings and distances agree very well with the official values derived from the state's survey control database, easily meeting accuracy specifications and survey regulation requirements. 55% of the unestablished marks surveyed were able to be upgraded to cadastral survey control quality. Enhancements in the GPS survey design would have enabled an even higher percentage of marks to be classified as established, showing that the RTK GPS technique is well suited to improving survey control infrastructure for cadastral surveyors.

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Exploitation of Marine Gravity Measurements of the Mediterranean in the Validation of Global Gravity Field Models

Lequentrec-Lalancette¹,

Salaün²,

Bonvalot³

et al. 2016

International Association of Geodesy Symposia

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The AUSGeoid98 geoid model of Australia: data treatment, computations and comparisons with GPS-levelling data

Cited by 105 publications

References 0 publications

A coastal retracking system for satellite radar altimeter waveforms: Application to ERS‐2 around Australia

A coastal retracking system for satellite radar altimeter waveforms: Application to ERS‐2 around Australia

Can RTK GPS be Used to Improve Cadastral Infrastructure?

Exploitation of Marine Gravity Measurements of the Mediterranean in the Validation of Global Gravity Field Models

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