Explanipedia

Height Anomaly Determination Using a Tile-Based LSC Approach: Program Development and Case Study Open

Neda Darbeheshti, J. C. McCubbine · 2025

Height anomaly computation from gravity anomalies follows a remove-compute-restore approach, where global gravity and terrain effects are removed, the height anomaly is predicted, and these effects are restored to obtain the final model. T…

Connecting Land and Sea Vertical Datums: A Data Evaluation for Developing Australia’s AUSHYDROID Model Open

M. S. Filmer, Paul Johnston, Z. Jayaswal, Andy Taylor, J. Chittleborough , et al. · 2024

Land and sea vertical datums have traditionally been separate reference levels, due to the different methodologies and observations used in their derivations. However, the need for a seamless connection of these datums has become important…

A Plate Motion Model of the Indo-Australian Tectonic Plate that Better Aligns with the Geodetic Coordinate System - Towards a More Precise Static Ellipsoidal Datum Open

J. C. McCubbine, Anna Riddell, Nicholas Brown · 2023

We present a class of “ellipsoidal rotation matrices” which can be used to characterise tectonic plate motion; where geocentric Cartesian coordinates travel along paths tangential to the ellipsoid. We contrast them with conventional Euler …

CRC-P-57322 High-resolution Real-time Airborne Gravimetry Open

Andrew Gabell, Timothy Crain, Glenn D. Hines, Farzin Amzajerdian, Bruce W. Barnes , et al. · 2021

Airborne gravimetry relies on removing inertial aircraft accelerations from total accelerations measured by an onboard gravimeter. NASA developed a Navigation Doppler Lidar ('NDL') for the US Space Program. The NDL measures velocities at t…

Evaluating temporal stability of the New Zealand quasigeoid following the 2016 Kaikōura earthquake using satellite radar remote sensing Open

J. C. McCubbine, Vaughan Stagpoole, Fabio Caratori Tontini, W. E. Featherstone, Matthew C. Garthwaite , et al. · 2019

SUMMARY Quasigeoid models can be determined from surface gravity anomalies, so are sensitive to changes in the shape of the topography as well as changes in gravity. Here we present results of forward modelling gravity/quasigeoid changes f…

GRAVIMETRIC GEOID MODELLING OVER PENINSULAR MALAYSIA USING TWO DIFFERENT GRIDDING APPROACHES FOR COMBINING FREE AIR ANOMALY Open

Muhammad Faiz Pa’suya, Ami Hassan Md Din, J. C. McCubbine, Abdullah Hisam Omar, Z. M. Amin , et al. · 2019

We investigate the use of the KTH Method to compute gravimetric geoid models of Malaysian Peninsular and the effect of two differing strategies to combine and interpolate terrestrial, marine DTU17 free air gravity anomaly data at regular g…

Using AUSGeoid2020 and its error grids in surveying computations Open

W. E. Featherstone, J. C. McCubbine, Sten Claessens, David Belton, Nicholas Brown · 2019

We present summarised formulas and worked examples for the propagation of geoid and vertical deflection errors through some common geodetic surveying computations, as well as a demonstration of their effects on least squares adjustments of…

Using AUSGeoid2020 and its error grids in surveying computations Open

W. E. Featherstone, J. C. McCubbine, Sten Claessens, David Belton, Nicholas Brown · 2019

We present summarised formulas and worked examples for the propagation of geoid and vertical deflection errors through some common geodetic surveying computations, as well as a demonstration of their effects on least squares adjustments of…

Error propagation for the Molodensky G1 term Open

J. C. McCubbine, W. E. Featherstone, Nicholas Brown · 2018

Molodensky G terms are used in the computation of the quasigeoid. We derive error propagation formulas that take into account uncertainties in both the free air gravity anomaly and a digital elevation model. These are applied to generate G…

Correction to: AUSGeoid2020 combined gravimetric–geometric model: location-specific uncertainties and baseline-length-dependent error decorrelation Open

Nicholas Brown, J. C. McCubbine, W. E. Featherstone, N. Gowans, A. Woods , et al. · 2018

AUSGeoid2020 combined gravimetric–geometric model: location-specific uncertainties and baseline-length-dependent error decorrelation Open

Nicholas Brown, J. C. McCubbine, W. E. Featherstone, N. Gowans, A. Woods , et al. · 2018

Description and release of Australian gravity field model testing data Open

W. E. Featherstone, Nicholas Brown, J. C. McCubbine, M. S. Filmer · 2018

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 Aug…

Description and release of Australian gravity field model testing data Open

W. E. Featherstone, Nicholas Brown, J. C. McCubbine, M. S. Filmer · 2018

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 Aug…

Gsolve, a Python computer program with a graphical user interface to transform relative gravity survey measurements to absolute gravity values and gravity anomalies Open

J. C. McCubbine, Fabio Caratori Tontini, Vaughan Stagpoole, Euan Smith, Grant O’Brien · 2018

A Python program (Gsolve) with a graphical user interface has been developed to assist with routine data processing of relative gravity measurements. Gsolve calculates the gravity at each measurement site of a relative gravity survey, whic…

The first Australian gravimetric quasigeoid model with location-specific uncertainty estimates Open

W. E. Featherstone, J. C. McCubbine, Nicholas Brown, Sten Claessens, M. S. Filmer , et al. · 2017

We describe the computation of the first Australian quasigeoid model to include error estimates as a function of location that have been propagated from uncertainties in the EGM2008 global model, land and altimeter-derived gravity anomalie…

Fast-Fourier-based error propagation for the gravimetric terrain correction Open

J. C. McCubbine, W. E. Featherstone, J. F. Kirby · 2017

We have identified a gap in the literature on error propagation in the gravimetric terrain correction. Therefore, we have derived a mathematical framework to model the propagation of spatially correlated digital elevation model errors into…

Airborne Gravity Across New Zealand - For An Improved Vertical Datum Open

J. C. McCubbine · 2016

It is important to be able to accurately determine the height of a point on the Earth in terms of the Earth's gravitational potential field. These heights predict how water will flow and so they are vital for engineering and surveying purp…

Airborne Gravity Across New Zealand - For An Improved Vertical Datum Open

J. C. McCubbine · 2016

It is important to be able to accurately determine the height of a point on the Earth in terms of the Earth's gravitational potential field. These heights predict how water will flow and so they are vital for engineering and surveying purp…

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