Explanipedia

Odhad hustoty kůry a globálního gravitačního pole Měsíce z dat družicové mise GRAIL a senzoru LOLA Open

Michal Šprlák, Shin‐Chan Han, W. E. Featherstone, Pavel Novák, Martin Pitoňák · 2022

V tejto štúdií používame Newtonov integrál v spektrálnej oblasti na riešenie dvoch geodetických/geofyzikálnych úloh pre Mesiac, viď [1]. V prvej úlohe odhadneme hustotu mesačnej kôry (inverzný problém). Využívame model gravitačného poľa GL…

Digitisation and analysis of historical vertical deflections in India Open

W. E. Featherstone, Ropesh Goyal · 2022

We describe the [somewhat tedious] process of digitising from a 1955 report that lists over 1000 vertical deflections in India and some surrounding countries. It involved error-checking with closed-loop tests and resolution of an ambiguity…

Land uplift linked to managed aquifer recharge in the Perth Basin, Australia Open

Amy Parker, Jon-Philippe Pigois, M. S. Filmer, W. E. Featherstone, Nicholas E. Timms , et al. · 2021

While the link between groundwater extraction and land subsidence is well documented, observations of land uplift associated with groundwater replenishment are less so. In the Perth Basin, Western Australia, a programme of managed aquifer …

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…

Applications of Satellite Radar Imagery for Hazard Monitoring: Insights from Australia Open

Amy Parker, Pascal Castellazzi, Thomas Fuhrmann, Matthew C. Garthwaite, W. E. Featherstone · 2021

Earth observation (EO) satellites facilitate hazard monitoring and mapping over large-scale and remote areas. Despite Synthetic Aperture Radar (SAR) satellites being well-documented as a hazard monitoring tool, the uptake of these data is …

Empirical comparison between stochastic and deterministic modifiers over the French Auvergne geoid computation test-bed Open

Ropesh Goyal, Jonas Ågren, W. E. Featherstone, Lars E. Sjöberg, Onkar Dikshit , et al. · 2021

© 2021 Survey Review Ltd. Since 2006, several different groups have computed geoid and/or quasigeoid (quasi/geoid) models for the Auvergne test area in central France using various approaches. In this contribution, we compute and compare q…

Australian quasigeoid modelling: Review, current status and future plans Open

Jack C. McCubbine, W. E. Featherstone, Nicholas Brown · 2021

We provide a historical review and critique of regional geoid and quasigeoid modelling over the Australian continent, covering the earliest models from the late 1960s through to the present day and beyond. The most recently released offici…

Empirical comparison between stochastic and deterministic modifiers over the French Auvergne geoid computation test-bed Open

Ropesh Goyal, Jonas Ågren, W. E. Featherstone, Lars E. Sjöberg, Onkar Dikshit , et al. · 2021

Since 2006, several different groups have computed geoid and/or quasigeoid (quasi/geoid) models for the Auvergne test area in central France using various approaches. In this contribution, we compute and compare quasigeoid models for Auver…

An experimental Indian gravimetric geoid model using Curtin University’s approach Open

Ropesh Goyal, W. E. Featherstone, Sten Claessens, Onkar Dikshit, Nagarajan Balasubramanian · 2021

New gravimetric-only and hybrid geoid models of Taiwan for height modernisation, cross-island datum connection and airborne LiDAR mapping Open

Cheinway Hwang, Hung‐Jui Hsu, W. E. Featherstone, Ching-Chung Cheng, Ming Yang , et al. · 2020

Crustal density and global gravitational field estimation of the Moon from GRAIL and LOLA satellite data Open

Michal Šprlák, Shin‐Chan Han, W. E. Featherstone · 2020

Disruptive influences of residual noise, network configuration and data gaps on InSAR-derived land motion rates using the SBAS technique Open

Luyen K. Bui, W. E. Featherstone, M. S. Filmer · 2020

Subtleties in spherical harmonic synthesis of the gravity field Open

Ropesh Goyal, Sten Claessens, W. E. Featherstone, Onkar Dikshit · 2020

<p>Spherical harmonic synthesis (SHS) can be used to compute various gravity functions (e.g., geoid undulations, height anomalies, deflections of vertical, gravity disturbances, gravity anomalies, etc.) using the 4pi fully normalised…

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…

A Sequential Monte Carlo Framework for Noise Filtering in InSAR Time Series Open

Mehdi Khaki, M. S. Filmer, W. E. Featherstone, Michael Kühn, Luyen K. Bui , et al. · 2019

This article proposes an alternative filtering technique to improve interferometric synthetic aperture radar (InSAR) time series by reducing residual noise while retaining the ground deformation signal. To this end, for the first time, a d…

An experiment to test satellite radar interferometry-observed geodetic ties to remotely monitor vertical land motion at tide gauges Open

M. S. Filmer, Simon Williams, Christopher W. Hughes, Guy Wöppelmann, W. E. Featherstone , et al. · 2019

The Potential for Unifying Global‐Scale Satellite Measurements of Ground Displacements Using Radio Telescopes Open

Amy Parker, Lucia McCallum, W. E. Featherstone, Lucia McCallum, Rüdiger Haas · 2019

The expansion of globally consistent satellite‐radar imagery presents new opportunities to measure Earth‐surface displacements on intercontinental scales. Yet global applications, including a complete assessment of the land contribution to…

Integral inversion of GRAIL inter-satellite gravitational accelerations for regional recovery of the lunar gravitational field Open

Michal Šprlák, Shin‐Chan Han, W. E. Featherstone · 2019

Spheroidal forward modelling of the gravitational fields of 1 Ceres and the Moon Open

Michal Šprlák, Shin‐Chan Han, W. E. Featherstone · 2019

Comments on “A high resolution Mars surface gravity grid” (Górski et al., 2018, Planetary and Space Science 160, 84–106) Open

Christian Hirt, W. E. Featherstone, Michael Kühn, Sten Claessens · 2019

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…

Regional recovery of the lunar gravitational field by inverting GRAIL line-of-sight gravitation observables Open

Michal Šprlák, Shin‐Chan Han, W. E. Featherstone · 2019

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

On the Use of Repeat Leveling for the Determination of Vertical Land Motion: Artifacts, Aliasing, and Extrapolation Errors Open

T. J. Lyon, M. S. Filmer, W. E. Featherstone · 2018

Leveling remains the most precise technique for measuring changes in heights. However, for the purposes of determining vertical land motion (VLM), a time series of repeat leveling measurements is susceptible to artifacts and aliasing that …

Comparison between geodetic and oceanographic approaches to estimate mean dynamic topography for vertical datum unification: evaluation at Australian tide gauges Open

M. S. Filmer, Christopher W. Hughes, Philip Woodworth, W. E. Featherstone, R. J. Bingham · 2018

A high-precision digital astrogeodetic traverse in an area of steep geoid gradients close to the coast of Perth, Western Australia Open

Peter Schack, Christian Hirt, Markus Hauk, W. E. Featherstone, T. J. Lyon , 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…

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