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Introduction
Additional affiliations
March 2018 - present
January 2017 - present
UNSW Australia
Position
- Research Associate
January 2017 - March 2018
Publications
Publications (81)
The rapid growth of the city of Sydney, Australia over the last decades, has led to significant development of residential and transportation infrastructure. Land subsidence associated with the urban development can lead to serious issues which should be thoroughly understood and carefully managed. To address this challenge, an enhanced polarisatio...
The implementation of a wide-land deformation monitoring program in Eastern states of Australia, characterized by an extensive landmass and extensive coastlines, necessitates the generation of deformation maps with a significantly larger spatial extent. A pragmatic approach for achieving such coverage involves the integration of multiple Interferom...
The Lianjiang Plain, renowned for its position as ‘China’s textile hub’ and characterized by its high population density, has experienced considerable subsidence due to excessive groundwater extraction in recent years. Although some studies have investigated short-term subsidence in this plain, research on long-term subsidence and rebound remain un...
The ancient Aniangzhai (ANZ) landslide in Danba County, Sichuan Province of southwest China was reactivated after a series of complex hazard events that occurred in June 2020. Since then, and until June 2021, emergency engineering work was carried out to prevent the further failure of the reactivated landslide. This study investigates the potential...
Land deformation is a pervasive hazard that could lead to serious problems, for example, increasing risk of flooding in coastal areas, damaging buildings and infrastructures, destructing groundwater systems, generating tension cracks on land, and reactivating faults, to name only a few [...]
The offset tracking approach has been widely used to measure large ground deformation as a complement to Interferometric Synthetic Aperture Radar (InSAR) when its coherence is poor and/or the deformation gradient is large. The standard offset tracking procedures estimate deformation of tie points, which are uniformly distributed over two SAR images...
On 17 June 2020, a large ancient landslide over the Aniangzhai (ANZ) slope, Danba County, Sichuan Province, China, was reactivated by a series of multiple phenomena, including debris flow triggered by heavy rainfall and flooding. In this study, Synthetic Aperture Radar (SAR) images acquired by the Sentinel-1A/B satellite and optical images captured...
After operating the middle route of South-to-North Water Diversion Project (SNWDP), the total water transfer to Beijing has exceeded 5.0 km³, bringing significant changes to the water use structure of Beijing. This article compiles historic data from 2007 to 2020 to analyze changes in water circulation, groundwater level, climate factors and subsid...
In modern life, metro and high-speed rails have become indispensable transportation and have been playing an important role in many areas, especially in cities. The metro and high-speed rails have varying degrees of impact on the surface and surrounding buildings, which must be carefully understood to minimize the risk of hazards. This work is aime...
Interferometric synthetic aperture radar (InSAR) time series technique has been widely applied to map the ground deformation over the past two decades. One of the key steps of InSAR time series approach is to select appropriate measurement scatterer (MS) pixels to build the triangulated irregular network (TIN). In order to build a stable TIN, there...
Compared with traditional measurement technologies, synthetic aperture radar interferometry (InSAR) has unique advantages in monitoring ground subsidence due to underground mining. However, when the subsidence gradient of the subsidence trough exceeds the maximum measurable gradient of InSAR technology, the interference fringes will be too dense, c...
Tailings dams are usually ponds bounded by valleys or surrounding topography to store mining or other chemical industrial waste. On 25 January 2019, the collapse of a tailings dam at the Córrego do Feijao iron ore mine (Brumadinho, Minas Gerais, Brazil) released about 12 million m3 of tailings, killing over 240 people and posing a considerable and...
Anthropogenic land subsidence is an example of changes to the natural environment due to human activities and is one of the key factors in causing land degradation at a range of scales. Previous studies assessing land subsidence in the Valley of Mexico either focused on regional scale or short (non‐continuous) temporal scale. In this study, long‐te...
A large earthquake with a magnitude of MW 7.3 struck the border of Iran and Iraq at the province of Kermanshah, Iran. In our study, coseismic deformation and source model of the 12 November 2017 Kermanshah Earthquake are investigated using ALOS-2 ScanSAR and Sentinel-1A/B TOPSAR Differential Interferometric Synthetic Aperture Radar (DInSAR) techniq...
Subsidence from groundwater extraction and underground tunnel excavation has been known for more than a decade in Guangzhou and Foshan, but past studies have only monitored the subsidence patterns as far as 2011 using InSAR. In this study, the deformation occurring during the most recent time-period between 2011 and 2017 has been measured using COS...
Advanced Time Series InSAR (ATS-InSAR) generally refers to those TS-InSAR methods with an external distributed scatterer selection module, e.g. SqueeSAR™, and GEOS-ATSA (Advanced Time-Series Analysis). It is being known as a very efficient tool for monitoring ground deformation over suburban or non-urban regions with great success. However, researc...
Continuous research has been conducted in Bandung City, West Java province, Indonesia over the past two decades. Previous studies carried out in a regional-scale might be useful for estimating the correlation between land subsidence and groundwater extraction, but inadequate for local safety management as subsidence may vary over different areas wi...
Knowledge on the interaction of active structures is essential to understand mechanics of continental deformation and estimate the earthquake potential in complex tectonic settings. Here we use Sentinel-1A radar imagery to investigate coseismic deformation associated with the 2016 Menyuan (Qinghai) earthquake, which occurred in the vicinity of the...
This paper describes the simulation and real data analysis results from the recently launched SAR satellites, ALOS-2, Sentinel-1 and Radarsat-2 for the purpose of monitoring subsidence induced by longwall mining activity using satellite synthetic aperture radar interferometry (InSAR). Because of the enhancement of orbit control (pairs with shorter...
Beijing City has suffered from groundwater-induced subsidence since the late 1930s and the over-exploration of groundwater could lead to subsidence as much as −12.0 cm yr⁻¹. Previous studies on the ground deformation at Beijing City mainly focused on the period before the year of 2014 when a mega-engineering project was launched to reduce water sho...
Coalbed methane (CBM) exploration generally refers to a technique that extracts natural gas from coal beds. The development of CBM in Liulin, China, has experienced a significantly growth period during the past two decades. Previous research mainly focused on the coal geological background or CBM technique itself, while time series InSAR (TS-InSAR)...
Land subsidence is a global issue and researchers from all over the world are keen to know the causes of deformation and its further influences. This paper reports the findings from time series InSAR (TS-InSAR) results over the Southern Coalfield, Australia using both ALOS-1 PALSAR (Phased Array type L-band Synthetic Aperture Radar) and ENVISAT ASA...
The 2015 Gorkha Nepal Earthquake sequence started with a magnitude Mw 7.8 main shock and continued with several large aftershocks, particularly the second major shock of Mw 7.3. Both earthquake events were captured using ALOS-2 ScanSAR images to determine the coseismic surface deformation and the source models. In this paper, the displacement maps...
Recent researches have illustrated with the image tracking method that Ordos, China is suffering from a significant drop in earth surface level. However, such method can lead to bias in terms of its accuracy. In this paper, land displacement in Ordos between 8 January 2007 and 19 January 2011 was mapped using L-band ALOS Phased Array type L-band Sy...
This paper reports the findings based on ALOS-1 and GRACE satellite data for the purpose of monitoring land surface subsidence due to groundwater extraction and underground mining activities in the Ordos Basin, China. 42 ALOS-1 PALSAR data (22 images from Frame 790 while 20 scenes from Frame 780) acquired between 8 January 2007 and 19 January 2011...
This article discusses the near real-time (NRT) satellite mapping activities in response to the recent Gorkha earthquake in Nepal by UNSW as well as other institutions around the globe. This study demonstrates that data from current SAR satellites can already be processed and delivered in near real-time to support post-disaster response and emergen...
In this paper, the land deformation in the Gippsland Basin, Victoria, Australia has been mapped using the interferometric synthetic aperture radar (InSAR) time-series analysis with the ALOS L-band SAR data. Land subsidence in the basin resulting from mining activities has already been known over the past few decades. There has been ongoing concern...
In this work, land subsidence in Bandung Basin, Indonesia between 2002 and 2011 was mapped using the C-band ENVISAT ASAR and L-band ALOS PALSAR data. Twenty four ALOS PALSAR and thirty ENVISAT ASAR images acquired between 2002–2008 and 2007 – 2011, respectively, were analysed. Several locations that were experiencing land displacement were identifi...
Differential interferometric synthetic aperture radar (DInSAR) technology is a new method to monitor the dynamic surface subsidence. It can monitor the large scope of dynamic deformation process of surface subsidence basin and better reflect the surface subsidence form in different stages. But under the influence of factors such as noise and other...
Differential interferometric synthetic aperture radar DInSAR is recognized as an effective remote-sensing technique for a variety of ground deformation mapping applications. Centimetre-level measurement accuracy can be achieved with the DInSAR technique. However, two key limitations – temporal decorrelation and phase delay due to atmospheric inhomo...
North China Plain (Huabei Plain) is one of the most densely populated regions on earth. Due to excessive underground water extraction, the North China Plain has been experiencing severe ground deformation over the last three decades. Therefore, for the purpose of hazard mitigation, it is necessary to monitor the ground displacement occurred in this...
The advanced working face model of DInSAR and GPS joint encryption observation was established based on the basic theory of mining subsidence. The two encryption times that are surge point and dramatic reduction point of surface subsidence velocity were obtained from this model. Therefore the effectiveness of surface dynamic deformation monitoring...
Using the advanced influence angles as examples, the calculation revision method is presented basing on the differential interference synthetic aperture radar (DInSAR) data obtained in West Cliff colliery mine in Australia. Through comparing the deviation between the actual advanced influence distance and the distance measured in DInSAR results, a...
In this paper, the capability of determining the three dimensional (3D) ground displacements due to underground mining using the multiple ALOS PALSAR interferometric pairs acquired with different viewing geometries has been investigated and validated in the area of West Cliff colliery, New South Wales (NSW), Australia. Four ALOS PALSAR interferomet...
Jakarta is the capital of Indonesia. It is one of the largest cities with an around 10 million population as for 2010, covering an area of about 661 square kilometers. The land subsidence phenomena in several areas of Jakarta are well known for many years. Land subsidence does damage infrastructures in the city; therefore, it has to be closely moni...
This paper investigated the long term ground deformation in Beijing, China, using persistent/permanent scatterer interferometry (PSI) techniques. GEOS-PSI (Geodesy and Earth Observing Systems-PSI), an in-house software developed at UNSW for PSI, has been applied to 41 ENVISAT ASAR images acquired over the metropolitan area of Beijing City between J...
This article presents 3D surface deformation mapping results derived from satellite synthetic aperture radar (SAR) data acquired over underground coal mines. Both ENVISAT Advanced Synthetic Aperture Radar (ASAR) and Advanced Land Observing Satellite (ALOS) Phased Array type L-band Synthetic Aperture Radar (PALSAR) data were used in this study. The...
This study investigates the use of multi-frequency (X- and L-band) Interferometric Synthetic Aperture Radar (InSAR) data for Digital Elevation Model (DEM) generation, coastline detection and land cover mapping over Heard, McDonald and Macquarie Islands in Australian Antarctic Territory. Conventional interferometric processing was applied to generat...
Subsidence in urban area has the potential to cause severe damage to ecosystems as well as economic loss. Therefore it is important to understand the subsidence phenomenon in urban area. The objective of this study is to investigate the terrain deformation in the metropolitan area of Jakarta, Indonesia using multiple satellite radar imagery. In thi...
The Southern Coalfield is located in the Sydney Basin, in the state of New South Wales (NSW), Australia. The coal seams of the Southern Coalfield contain high quality, hard coking coals which are mostly used for steel production. This paper describes an approach developed to study the subsidence associated with underground coal mining activity in t...
The construction of the Beijing–Tianjin high-speed railway line started in July 2005. The railway has been completed and opened to traffic in August 2008, just before the Beijing Olympic Games. The 113 km railway costing 13.3 billion Yuan (US $1.5 billion) is the country's first high-standard passenger rail. It is also believed to be the pilot proj...
Satellite differential radar interferometry (DInSAR) has played a pivotal role in observing the ground deformation caused by seismic events in recent years. The Ms8.0 Wenchuan Earthquake occurred on 12 May 2008 have caused tremendous losses in lives and properties of the people in affected areas. In this paper, the surface co-seismic deformation fi...
The Satellite Differential Interferometric Synthetic Aperture Radar (DInSAR) has already demonstrated its potential to map co-, post- and inter-seismic deformation. This paper presents an.alysis of the surface-displacement field of the 12 May 2008 magnitude 8.0 Wenchuan Earthquake using the Advanced Land Observing Satellite (ALOS) Phased Array type...
The Advanced Land Observing Satellite (ALOS), launched on 24 January 2006, is a Japanese satellite carrying an L-band SAR sensor, namely the PALSAR, which is expected to demonstrate good performance in applications such as crustal deformation measurement, subsidence detection and landslide monitoring. This paper describes a case study of Differenti...
The purpose of this paper is to monitor deformation due to groundwater extraction in urban area using Persistent Scatterer InSAR (PSInSAR) and Photogrammetry. Theoretically, PSInSAR technique allows for millimetre precision ground deformation mapping based on the utilization of long period of interferometric SAR data. One main advantage of PSInSAR...
The `baseline' is one of the most important parameters in Interferometric Synthetic Aperture Radar (InSAR). The quality of InSAR products is significantly affected by the accuracy of baseline estimation. In this paper, a new approach to improving the baseline estimation is proposed. The main advantage of estimating baseline by the proposed method i...
This paper describes the results from the recently launched SAR satellites for the purpose of subsidence monitoring over underground coal mine sites in the state of New South Wales, Australia, using differential interferometric synthetic aperture radar (DInSAR) technique. The quality of the mine subsidence monitoring results is mainly constrained b...
The Wenchuan Earthquake (Ms 8.0, 12 May 2008) ruptured about 400km of faults in the Sichuan Province, southwest of China. The PALSAR sensor onboard the ALOS satellite imaged the earthquake-stricken area on seven overflight tracks before and after the quake, while the ASAR sensor onboard the Envisat satellite provided images from two tracks. Working...
Satellite differential SAR interferometry has been widely accepted as a powerful tool to map co-, post- and inter-seismic deformation since its successful application to the 1992 Landers Earthquake. As soon as the Ms8.0 Wenchuan Earthquake occurred on 12 May 2008 in the Sichuan Province of southwestern China, the Japan Aerospace Exploration Agency...
In conventional differential radar interferometry (DInSAR), the ground surface displacement can be measured along the line-of-sight.
In order to measure the vertical and horizontal displacements DInSAR results of the same deformation derived from at least
two different look directions are required. This study utilised the DInSAR results generated f...
Continued excessive extraction of groundwater may lead to significant land subsidence, which causes economic loss. The aim
of this research is to investigate ground subsidence in several Australian capital cities using the Persistent Scatterer Interferometry
approach. Such studies may help improve our understanding of the deformation of terrain and...
The purpose of this paper is to demonstrate the application of C-band ERS-1/2 and ENVISAT radar images to investigate the urban subsidence due to groundwater extraction. Cities in Australia without groundwater being over-extracted are compared to cities in Australia and China with groundwater being over-extracted. The persistent scatterer InSAR res...
Land surface deformation due to underground mining is always a concern to the local communities and environment. The underground coal mines at the study site in Northern China are located quite closely to each other. In order to ensure safe mining as well as to prevent illegal mining activities, differential radar interferometry (DInSAR) was introd...
This paper describes the results using data from ALOS and ENVISAT satellites for the purpose of subsidence monitoring over underground coal mine sites in the state of New South Wales, Australia, using the differential interferometric synthetic aperture radar (DInSAR) technique. The quality of the mine subsidence monitoring results is mainly constra...
Volcanic eruptions are one of the most serious of nature's calamities, threatening both human lives and property in its immediate vicinity. The dangerous environment surrounding a volcano also causes great difficulties for close-up monitoring and surveillance. A satellite remote sensing technique -Differential Interferometric Synthetic Aperture Rad...
This study uses the spaceborne radar interferometry technique to monitor ground subsidence and far-field displacement due to underground longwall mining in the Southern Coalfields of New South Wales, Australia. The radar images acquired by the European ENVISAT/ASAR and the Japanese ALOS/PALSAR sensors were used to compute the terrain deformation. A...
Satellite differential interferometric synthetic aperture radar (DInSAR) has already demonstrated its potential to map co-, post-and inter-seismic deformation since its successful application to the 1992 Landers Earthquake. The Ms 8.0 Wenchuan Earthquake, which occurred on 12 May 2008, was the strongest earthquake to strike China since the 1976 Tan...
In this paper, the capability of determining three dimensional (3D) ground displacements due to underground mining using multiple ALOS PALSAR interferometric pairs acquired with different viewing geometry has been demonstrated in the area of West Cliff colliery, for longwall 32. 3D displacement maps have been derived from four interferometric pairs...
Coherence plays a significant role in constructing an accurate Digital Elevation Models (DEM) derived from Interferometric Synthetic Aperture Radar technique. The quality of coherence is often envisaged to be controlled substantially by the magnitude of baseline, wavelength and time span. However, weather conditions (i.e. rainfall) during SAR acqui...
