Is. Parcharidis

Harokopio University of Athens | HUA · Department of Geography

This study employs advanced synthetic aperture radar (SAR) techniques, specifically the small baseline subset (SBAS) method, to analyze ground deformation dynamics on Aegina, a volcanic island within the Hellenic Volcanic Arc. Using Sentinel-1 satellite data spanning January 2016 to May 2023, this research reveals different deformation behaviors. T...

The 30th Issue of the Newsletter of the Environmental, Disaster and Crises Management Strategies is the outcome of a fruitful collaboration and knowledge sharing between geologists, civil engineers, geographers and oceanographers interested in mapping and monitoring the “Daniel” storm and its effects on the natural and built environment and various...

In 2023, Greece faced its worst wildfire season, with nine major fires causing unprecedented environmental damage of 1470.31 km2. This article uses Copernicus Land Monitoring Service and Sentinel-2 data, employing advanced remote sensing and GIS techniques to analyze spatial dynamics, map burn severity, assess fire extent, and highlight pre-fire tr...

Coastal environments offer unique features and economic opportunities. However, they face increasing risks from climate change, tourism, and coastal urbanization. This study focuses on the utilization of machine learning for urban mapping on the islands of Thira and Milos in low-lying coastal regions. The findings indicate that urbanization expansi...

On 6 February 2023, an M7.8 devastating earthquake started rupturing the East Anatolian fault system in Turkey, resulting in intense shaking that lasted over a minute. A second earthquake of magnitude 7.5 struck near the city of Elbistan a few hours later. Both of these events are associated with the East Anatolian fault system. The earthquake sequ...

Coastal environments are highly recognized for their spectacular morphological features and economic activities, such as agriculture, maritime traffic, fishing, and tourism. In the context of climate change and the evolution of physical processes, the occurrence of intense natural phenomena adjacent to populated coastal areas may result in natural...

The main objective of this study was to investigate the stability of the Acropolis Hill, Greece, by developing a Rock Instability Model (RIM) based on fuzzy logic and remote sensing techniques. RIM aimed to identify locations on the rock formations of the Acropolis Hill that will potentially have instability issues due to the action of geomorpholog...

This study focuses on the Eastern Thessaly basin (Central Greece) which is one of the most characteristic examples of land subsidence in the Greek region. This was mainly caused by the artificial drainage of Lake Karla in the early 1960s for the purpose of reclamation of agricultural land. The long-term pumping of water for agricultural activities...

This study deals with the estimation of subtle ground deformation at millimetric accuracy over the deltaic plain of the Evinos River, its spatio-temporal distribution for the period between 2015 and 2020 through the method of Small Baseline Subset (SBAS) Interferometry and the influence of sediment compaction on the differential subsidence in the d...

Contributing to the United Nations 2030 Sustainable Development Goals (SDGs) within Target 11.4 “Strengthen efforts to protect and safeguard the world’s cultural and natural heritage”, it is critical to monitor the spatial and temporal stabilities of cultural heritages. The study of the interactive relationship between earthquakes and the protectio...

The objective of the present study is to utilize Copernicus satellite data to monitor the Total Suspended Matter concentration in the South Evoikos Gulf after the flooding of Lilas river in Central Evia Island on the 9 th of August 2020. This flash flood event caused large amounts of sediments and debris to be carried by the Lilas river to the Sout...

The present study aims to monitor the water quality in Timsah Lake by satellite data, the largest water body in Ismailia district, Egypt. To achieve this, multi-temporal space-born data of both Landsat-8 OLI-(L1 and L2) and Sentinel-2 (2A and 2B) were used during 2014-2020. The methodologies of Case 2 regional coast colour algorithm and aquatic ref...

The present study aims to monitor the water quality in Timsah Lake by satellite data, the largest water body in Ismailia district, Egypt. To achieve this, multi-temporal space-born data of both Landsat-8 OLI- (L1 and L2) and Sentinel-2 (2A and 2B) were used during 2014–2020. The methodologies of Case 2 regional coast colour algorithm and aquatic re...

El arco volcánico heleno es una región volcánica activa que ha de ser estudiado para su vigilancia. La isla de Santorini ha sido monitoreada para conocer la distribución espacial de la deformación desde 1992. Los satélites de Observación de la Tierra (EO) juegan un papel muy importante en el objetivo de monitorear el peligro de los volcanes. La Int...

Coastal environments are globally recognized for their spectacular morphological characteristics as well as economic opportunities, such as fisheries and tourism industries. However, climate change, growth in tourism, and constant coastal urban sprawl in some places result in ever-increasing risk in the islands of the South Aegean Volcanic Arc (SAV...

The environmental effects of wildfires are a hot issue in current research. This study examines the effects of the 2021 wildfires in the Attica region in Greece based on Earth observation and GIS-based techniques for the development of a web app that includes the derived knowledge. The effects of wildfires were estimated with the use of Sentinel-2...

Wildfires constitute one of the most major environmental problems, causing soil degradation and desertification, by destroying plant material and the litter layer. The severity and duration of a wildfire play a leading role in forests’ management (Karamesouti et al., 2015). Having damaged irreversibly the ecosystems by their dramatical impact on so...

The aim of the present study is to monitor the water quality in Timsah Lake by satellite data, the largest water body of Ismailia district, Egypt. Timsah Lake is subjected to significant environmental pressures, caused by various anthropogenic activities in Ismailia city. Lake Timsah is considered a highly eutrophic lake [1]. Within the framework o...

This paper focuses on the line-segment Bembo-Saint Francis of the masonry walls of Chandakas in the city of Heraklion, Greece. The construction of the wall was decided in 1462, but 100 years were needed until the design was finalized and construction began at the beginning of the 16th century. The line-segment was constructed as part of the fortifi...

Coastal environments are a transition zone between the land and the open sea, that gather different habitat types and support human activities. Total Suspended Matter (TSM), which reaches the coastal zones via rivers and streams, is one of the main water quality indicators. Ιt is comprised of organic and inorganic constituents, like phytoplankton a...

Synthetic Aperture Radar (SAR) data and Interferometric SAR (InSAR) products in particular, are one of the largest sources of Earth Observation data. InSAR provides unique information on diverse geophysical processes and geology, and on the geotechnical properties of man-made structures. However, there are only a limited number of applications that...

We investigate an earthquake sequence involving an Mw = 4.6 mainshock on 2 December 2020, followed by a seismic swarm in July–October 2021 near Thiva, Central Greece, to identify the activated structures and understand its triggering mechanisms. For this purpose, we employ double-difference relocation to construct a high-resolution earthquake catal...

The 27 September 2021 damaging mainshock (Mw6.0) is the first known strong earthquake that ruptured the Arkalochori area, Crete Isl., Greece, during the entire historical period, making it an unexpected event in the long-term sense. The area is characterized by the presence of the normal active Kastelli Fault (KF) striking NNE-SSW and dipping towar...

Infrastructure monitoring can facilitate the evaluation of capacity and functionality loss and therefore provide valuable data and evidence for reliable, lifetime and automated risk assessments. Terrestrial monitoring systems can provide information about assets and their condition. Yet, they fall short of engineering requirements related to the hi...

Earth’s ecosystems are extremely valuable to humanity, playing a key role ecologically, economically, and socially. Wildfires constitute a significant threat to the environment, especially in vulnerable ecosystems, such as those that are commonly found in the Mediterranean. Due to their strong impact on the environment, they provide a crucial facto...

The preventive monitoring and sustainable conservation of large-scale cultural heritage sites require satellite-based Earth observations. In this study, we present the first monitoring and thematic mapping results of the Badaling Great Wall (Beijing, China) using deformation indicators calculated from very high-resolution (VHR) multi-temporal spotl...

The volcanic complex of Cumbre Vieja on the island of La Palma is in eruption (October 2021) with serious implications for the inhabits of the island. SAR interferometry has been used as an operational tool in order to monitoring active volcanoes. The current study concerns the application of DinSAR and MTInSAR-SBAS in the area using Sentinel 1 SLC...

Web App Link: https://learn-students.maps.arcgis.com/apps/webappviewer/index.html?id=64389b35e2cc476aa00cb26858b454c1

This presentation shows the combination of multiple information regarding Shoreline Change measurements, Vertical Deformation measurements and Land Cover types in a single product that can be used for monitoring shorelines. Such a product is particularly important for determining socio-economic and environmental effects, and assessing future change...

On 27 of September 2021, a strong earthquake struck close to the Arkalochori settlement, Crete (M=5,8). We are glad to present to you our results on M=5.8 27/9/2021 Earthquake in Arkalochori Crete, Greece. An ESRI ArcGIS Online Story Map presenting our approach to the earthquake event as well as the detailed results were created. Also, a useful We...

SCIENCE is a large bilateral project between Greece and China introducing advanced engineering research to the service of monument protection. In particular, SCIENCE develops a new approach to estimate the vulnerability of cultural heritage monuments through the innovative technique of multitemporal Synthetic Aperture Radar Interferometry (MT-InSAR...

Three strong earthquakes ruptured the northwest Thessaly area, Central Greece, on the 3, 4 and 12 March 2021. Since the area did not rupture by strong earthquakes in the instrumental period of seismicity, it is of great interest to understand the seismotectonics and source properties of these earthquakes. We combined relocated hypocenters, inversio...

On 2 December 2020, a moderate and shallow Mw = 4.6 earthquake occurred in Boeotia (Central Greece) near the city of Thiva. Despite its magnitude, the co-seismic ground deformation field was detectable and measurable by Sentinel-1, ascending and descending, synthetic aperture interferometry radar (InSAR) acquisitions. The closest available GNSS sta...

Mapping burned areas using dNBR (differenced Normalized Burn Ratio) and Land Cover data that affected from the recent wildfire in Regions of Corinth and Western Attica. Wildfires in Peloponnese and Attica Western regions, Greece had prompted evacuations and extensive ecological and financial impacts. https://storymaps.arcgis.com/stories/b30bcd921e9...

Remote Sensing applications are at the core of our modern technologies and its data is valuable in most human activities. Due to its vast impact in everyday life, several projects consider importing Remote Sensing in compulsory education. By its nature, Remote Sensing is strongly depended on software and Information Technology in general. Since the...

The ultimate objective of the SpaCeborne SAR Interferometry as a Nonivasive tool to assess the vulnerability over Cultural hEritage sites (SCIENCE) is to predict the vulnerability of the archaeological sites to ground deformation in time and space and protect them against natural/man-made damage. The SCIENCE project aims to develop, demonstrate, an...

On 30 October 2020, an Mw = 7.0 earthquake struck the eastern Aegean Sea. It triggered earthquake environmental effects (EEEs) on Samos Island detected by field surveys, relevant questionnaires , and Interferometric Synthetic Aperture Radar (InSAR) analysis. The primary EEEs detected in the field comprise coseismic uplift imprinted on rocky coasts...

Presentation of the research activities of HUA EO Team.

This paper aims to investigate the capability of Sentinel-1 Synthetic Aperture Radar (SAR) data to detect hydrothermal alteration zones within the caldera of the Nisyros volcano in Greece through a multitemporal interferometric coherence analysis. For that purpose, seven ascending pass Sentinel-1B SAR Single Look Complex images were collected spann...

The unprecedented order, in modern peaceful times, for a near-total lockdown of the Greek population as a means of protection against severe acute respiratory syndrome coronavirus 2, commonly known as COVID-19, has generated unintentional positive side-effects with respect to the country's air quality levels. Sentinel-5 Precursor/Tropospheric Monit...

Architectural heritage has important historical, artistic, and technological value. However, these sites are subject to long-term degradation and are sensitive to disturbances from the surrounding landscape, resulting in the potential deterioration of the architecture. Deformation is a quantitative indicator of the vulnerability of architectural he...

The aim of this study was to propose a methodology that provides a detailed description of the argillic zone of a hydrothermal field, based on satellite multispectral data. More specifically, we developed a method based on spectral unmixing where hydroxyl-bearing alteration is represented by a single endmember (representing clays) and the three (ne...

Despite substantial increases in our understanding of geophysical hazards, the rates of loss from them have increased over time, largely because of increased societal exposure. Specifically, earthquake risk is increasing globally more or less in direct proportion to exposure in terms of the population and the human built environment. Although some...

Cultural heritage is a key element of history; the ancient monuments and archaeological sites enrich today’s societies and help connect us to our cultural origins. Protection and conservation of our cultural assets for future generations in the face of various natural or anthropogenic hazards is a major concern nowadays. Heritage sites and monument...

Remote sensing is a useful tool for effective monitoring of anthropogenic and natural changes, qualitatively, reliably, at low cost and time. Wildfires are a usual phenomenon in Greece during summer, causing severe damages and result to the loss of human lives and property. The increasing trend of the occurrence of these events require the mapping...

In this study, an integrated monitoring and evaluation approach was proposed to fix the systematic safeguarding gap of the Great Wall corridor using space technologies. Two representative sections of the Great Wall located in Qingtongxia County and Zhangjiakou City in China were selected for a preliminary comparative investigation to ascertain the...

The Methana volcano in Greece belongs to the western part of the Hellenic Volcanic Arc, where the African and Eurasian tectonic plates converge at a rate of approximately 3 cm/year. While volcanic hazard in Methana is considered low, the neotectonic basin constituting the Saronic Gulf area is seismically active and there is evidence of local geothe...

Land subsidence in the coastal zone of the Neo Faliro, Moschato, and Kallithea municipalities, along the Faliro bay, has been recorded since the mid 1960’s. This phenomenon has caused damage to buildings, pavements, and roads. Aiming to identify the main causes of the observed ground deformations, data referring to the geological, geotechnical, and...

The current study analyzes how a geospatial intelligence application can turn into a useful operational tool in the immediate post-earthquake phase of infrastructure inspection that may have been affected by the co-seismic ground deformation due to very strong earthquake event. As a case study, the Durres (Central Albania) earthquake on November 26...

Cultural heritage is a key element of our history. The ancient monuments and archaeological sites enrich our societies and help us to connect to our cultural origins. Many processing techniques showed high potential for monitoring and evaluating settlement induced damage to critical structures and specifically to cultural heritage. An increase in t...

The unprecedented order, in modern peaceful times, for near-total lockdown of the Greek population, as means of protection against the Severe Acute Respiratory Syndrome CoronaVirus-2, commonly known as COVID-19, infection, has brought unintentional positive side-effects to the country's air quality levels. S5P/TROPOMI monthly mean tropospheric nitr...

The rise in sea level is expected to considerably aggravate the impact of coastal hazards in the coming years. Low-lying coastal urban centers, populated deltas, and coastal protected areas are key societal hotspots of coastal vulnerability in terms of relative sea level change. Land deformation on a local scale can significantly affect estimations...