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Research activities (brief)

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His research interest is focused on signal analysis/processing applied on exploiting active microwave satellite and GNSS data as well as other in-situ observations (i.e. inclinometers, levelling, gravimeters), aiming at the detection and measuring of the ground deformation and infrastructure instability due to geophysical processes or human-induced activities.

Moreover, ionospheric conditions and the humidity of the ionosphere and troposphere respectively, represent components of noise or by-products for both GNSS and SAR data, due to the caused phase delay of the propagating microwaves in the intermediate medium. By combining both of them, not only the main products, the estimated ground deformation can be more precise in time and in space and so does the modeled deformation sources (in cases of earthquakes and aseismic active faulting) but the Wet Tropospheric Delay and the Total Electron Content by-products can be exploited for other studies and applications such as space weather and meteorology. 

Technical Skills (brief)

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Signal/image processing and IT specialist, RDBMS and (Web)GIS developer, administrator of local network and its network servers as well as the Meteosat and NOAA/AVHRR ground reception stations.

He has designed, developed and implemented a number of methods for the automatic acquisition, (pre)processing, enhancement and analysis of remotely sensed EO data acquired from a series of optical and radar satellite, air-borne sensors as well as in-situ measurements, acting in synergy in a case by case basis data, aiming to the emergence of thematic information and automatic detection of alert signals.

PhD Thesis

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You can download the full or the abstract of the PhD Thesis entitled Ground deformation observed in the western Corinth rift (Greece) by means of SAR interferometry.

Brief Curriculum Vitae


Dr. Elias has participated in more than 35 research projects for applications in geosciences in the field of satellite geodesy, signal/image processing and computer science, exploiting the synergy in a case by case basis of remote sensed optical and SAR data and in-situ measurements such as GNSS, levelling and seismic data.

His research interest is focused on signal analysis/processing applied on exploiting active microwave satellite and GNSS data as well as other in-situ observations (i.e. inclinometers, levelling, gravimeters), aiming at the detection and measuring of the ground deformation and infrastructure instability due to geophysical processes or human-induced activities. Moreover, he has conducted tasks aiming at the advancing of methodology and modelling through inversion of the deformation source in elastic and homogeneous medium, considering the underlying geodynamical and geophysical context. In this framework, he has enhanced and implemented a number of techniques for the emerging of useful signal, such as the component of ground deformation, by eliminating the noise interferences due to the atmosphere, topography etc. He has also designed, developed and implemented a number of methodologies for the automatic acquisition, pre/processing, enhancement and analysis of these data, aiming to the enhancement of thematic information and automatic detection of alert signals.

Moreover, ionospheric conditions and the humidity of the ionosphere and troposphere respectively, represent components of noise or by-products for both GNSS and SAR data, due to the caused phase delay of the propagating microwaves in the intermediate medium. By combining both of them, not only the main products, the estimated ground deformation can be more precise in time and in space and so does the modeled deformation sources (in cases of earthquakes and aseismic active faulting) but the Wet Tropospheric Delay and the Total Electron Content by-products can be exploited for other studies and applications such as space weather and meteorology. Motivated by this Dr. P. Elias is participating in multidisciplinary studies which are also being combined and controlled with ionospheric soundings and meteorological models.  Due to their particular nature the by-products of GNSS and SAR data contribute complementary with the other methods dealing with the atmospheric conditions. This component of his research activities can be demonstrated by his collaborations with the space weather group of IAASARS, the IERSD and the GEIN inside NOA but also with the École Normale Supérieure, the European Space Agency, the Harokopio University of Athens and the University of Patras. There are a number of relevant publications co-authored by members of these entities for the studies that have been completed (paper publications) or announcements to relevant conferences for the studies being carried on.

He is studying in detail the area of the Gulf of Corinth (Greece) and the broader area of the city of Patras (Greece) and the central Ionian Sea. He is also studying surface deformations due to earthquakes which have occurred in the Island of Lefkada (Greece) in 2015 and 2003, Island of Cephalonia (Greece) in 2014, Nafpaktos (Greece) in 2010 and Movri (Greece) in 2008. Moreover, he has studied the earthquakes of Athens (Greece) in 1999 and L'Aquila (Italy) in 2009 as well as the volcanic activity in the Island of Nisyros (Greece) and Etna (Italy). Finally, he has studied landslides in the Prefecture of Peloponnesus and along the highway of Egnatia-Odos (Greece).

For these studies, he is exploiting a number of data from satellite-borne SAR sensors as well as campaign and continuous GNSS measurements, in synergy or independently. He has experience on processing and analysing data from SENTINEL-1, ENVISAT, ERS1&2, Cosmo-SkyMed, TerraSAR-X, RADARSAT-2 and ALOS. He is Principal Investigator of the corresponding space agencies for acquiring the forth mentioned data after peer-reviewed proposal submissions.

He is responsible from the Greek side for 22 continuous GNSS stations in the Corinth Rift Observatory.

He has experience in GNSS processing for estimation of positioning and ground deformation.

He has participated in a number of GNSS campaigns and installation of continuous GNSS stations in the Gulf of Corinth, Lefkada, Cefalonia and Aitoloakarnania (Greece). He has participated in absolute gravimetric measurements in the Gulf of Corinth. He has experience of maintenance of GNSS and seismic stations in the field.

He has implemented and is administrating the daily automatic solutions of continuous GNSS stations (http://gnss.space.noa.gr).

He was responsible for the integration of Digital Upper Atmosphere System (DIAS-http://dias.space.noa.gr) services in the premises of IAASARS. Currently, he is the System administrator of all Ionospheric services (European Digisonde Service of Space Situational Awareness: http://swe.ssa.esa.int/web/guest/dias-federated,TEC, TEC provision from EUREF GNSS: http://vanallen.space.noa.gr/tid and directory-index service in European e-science platform to access near-Earth space data - EPAS). Moreover, he is supporting the operation and maintenance of the ionospheric station of IAASARS.

He has been administrator of LAN, network servers and ground reception stations of IAASARS.

He is experienced in unix (administrator and user), shell scripting language and virtualisation.

He is experienced in Matlab, Python, C, Fortran, SQL and GMT.

He is experienced in SAR processing tools such as StaMPS, SARSCAPE, ROI_PAC, GMT-SAR, DIAPASON and DORIS. He is a user in ESA’s GAMMA CloudToolBox.

He has teaching experience in master and undergraduate levels and seminars for GNSS, SAR interferometry and image processing.

He is providing support in supervising and assistance to a number of students (undergraduates, postgraduates and PhD candidates), in the field of satellite geodesy, signal/image processing and geosciences. He had supervised internships of students from Harokopio University and Technical University of Crete.

He is a reviewer in international scientific papers such as the International Journal of Remote Sensing, Studia Geophysica et Geodaetica, Remote Sensing, Remote Sensing Letters, Journal of Mathematical Problems in Engineering and Journal of Zhejiang University.

He was a member of the “ESA Living Planet Symposium Scientific Committee” in 2010 and 2013.

On April 2016 Dr. P. Elias has submitted a proposal in the framework of INTERREG IPA Cross Border Cooperation programme Greece – FYROM, Priority axes Protection of Environment – Transportation. Coordinator of the proposal is the Region of Western Macedonia, Greece. Partners are the Aristotle University of Thessaloniki, Greece, Center for development of Pelagonija region, FYROM and Crisis Management Center, FYROM. Currently, the outcome hasn’t be published

He is an author of 16 papers in peer reviewed International Journals (currently two of them in press), five peer reviewed conference papers (SPIE) and more than 50 presentations in International Conferences. Please look at the publication metrics from ResearcerID, Google Scholar and Web of science in Appendix A.

Greek is his mother tongue. He is fluent in English language, spoken written and working (First Certificate in English, University of Cambridge). He is moderate in spoken and working French.

 

 

Last Updated on Wednesday, 23 November 2016 21:03

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