Iphigenia Keramitsoglou

Iphigenia Keramitsoglou
National Observatory of Athens | NOA · Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing (IAASARS)

Dr.

About

111
Publications
29,977
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2,147
Citations
Additional affiliations
August 2006 - present
National Observatory of Athens
January 1999 - July 2006

Publications

Publications (111)
Article
Full-text available
The diurnal and annual cycles of Earth drive the land surface temperature (LST) variations in space and time but their combined effects are conveyed differently from place to place as a function of climate, local weather conditions, and surface characteristics. Fitting a model of the diurnal or annual LST cycle (DTC and ATC, respectively) to satell...
Article
Full-text available
Rapid advances in wearable technologies and real-time monitoring have resulted in major inroads in the world of recreational and elite sport. One such innovation is the application of real-time monitoring, which comprises a smartwatch application and ecosystem, designed to collect, process and transmit a wide range of physiological, biomechanical,...
Article
Full-text available
Spatial variability in temperature exists within metropolitan areas but very few studies have investigated intra-urban differentiation in the temperature-mortality effects. We investigated whether local characteristics of 42 Municipalities within the Greater Athens Area lead to modified temperature effects on mortality and if effect modifiers can b...
Article
Full-text available
The urban heat island (UHI) effect influences the heating and cooling (H&C) energy demand of buildings and should be taken into account in H&C energy demand simulations. To provide information about this effect, the PLANHEAT integrated tool-which is a GIS-based, open-source software tool for selecting, simulating and comparing alternative low-carbo...
Article
Full-text available
Intensification of extreme temperatures combined with other socioeconomic factors may exacerbate human thermal risk. The disastrous impacts of extreme weather during the last two decades demonstrated the increased vulnerability of populations even in developed countries from Europe, which are expected to efficiently manage adverse weather. The stud...
Conference Paper
Full-text available
Research on links between urbanization and urban heat islands (UHI), their effects, and mitigation strategies have gained significant impetus over the past decade due to a warming planet and overall increase in the number of city dwellers during the 21st century. For example, it is projected that nearly 66% of the world's population will live in ci...
Conference Paper
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The recent socioeconomic and environmental impacts of extreme flood events occurred in Europe are testimony to the disastrous consequences that such future hazards are likely to pose. Managing inundation risk requires prevention measures in close cooperation with Civil Protection authorities. This topic underlies the TRIBUTE (TRIgger BUffers for in...
Article
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This study focuses on the assessment of surface solar radiation (SSR) based on operational neural network (NN) and multi-regression function (MRF) modelling techniques that produce instantaneous (in less than 1 min) outputs. Using real-time cloud and aerosol optical properties inputs from the Spinning Enhanced Visible and Infrared Imager (SEVIRI) o...
Conference Paper
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In the framework of the GEO-CRADLE project (http://geocradle.eu/en/), we introduced a novel Solar Energy Now-casting System (SENSE; http://solea.gr/), in order to coordinate, improve and support the regional Earth Observation (EO) infrastructures and capabilities, in Europe, North Africa and Middle East, related to "access to energy". The niche for...
Article
The land surface temperature (LST) drives many terrestrial biophysical processes and varies rapidly in space and time primarily due to the earth's diurnal and annual cycles. Models of the diurnal and annual LST cycle retrieved from satellite data can be reduced to several gap-free parameters that represent the surface's thermal characteristics and...
Poster
Full-text available
The downscaling of geostationary diurnal thermal data can ease the lack of land surface temperature (LST) datasets that combine high spatial and temporal resolution. However, the downscaling of diurnal LST data is more demanding than single scenes. This is because the spatiotemporal interrelationships of the original LST data have to be preserved a...
Article
Elevated urban temperatures and heatwaves are a serious threat to the health and wellbeing of the continuously growing urban population and are projected to worsen under climate change. For this reason well-informed disaster risk reduction (DRR) actions, where science and technology play a key role, are required. However insufficient communication...
Article
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ERA-PLANET is a wide European network comprised of 118 researchers from 35 partner institutions located in 18 countries, aiming to strengthen the European Research Area in the domain of Earth Observation (EO) in coherence with the European participation to the Group on Earth Observation (GEO) and the program for the establishment of a European capa...
Article
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The World Urban Database and Access Portal Tools (WUDAPT) is a community initiative to collect worldwide data on urban form (i.e., morphology, materials) and function (i.e., use and metabolism). This is achieved through crowdsourcing, which we define here as the collection of data by a bounded crowd, composed of students. In this process, training...
Chapter
Full-text available
Lakeshore vegetation, and in general wetlands, are a challenging case for mapping given the inherited complexity of the ecosystems they host and their associated dynamic temporal and spatial nature. Remote sensing has been traditionally a tool for vegetation related studies; however the applications and capabilities it offers are constrained by the...
Article
Full-text available
The downscaling of geostationary diurnal thermal data can ease the lack of land surface temperature (LST) datasets that combine high spatial and temporal resolution. However, the downscaling of diurnal LST data is more demanding than single scenes. This is because the spatiotemporal interrelationships of the original LST data have to be preserved a...
Poster
Full-text available
TREASURE Mobile App is developed to provide citizens with real time information on their risk due to exposure to high temperatures. It estimates the air temperature at the specific location of the user. It then assesses the personalized heat wave risk based on the user profile. The app can also assess the heat wave risk of other people (e.g. family...
Poster
In light of efforts made by the Government of the Arab Republic of Egypt to achieve the desired economic growth while preserving the environment, the government tries to address the demand for energy efficiency through the use of renewable energy sources. In the framework of the HORIZON 2020 GEO­Cradle project (www.geocradle.eu), we report on the e...
Article
Full-text available
Heat waves are projected to become more frequent, longer-lasting, and intense. At the same time, urban areas are confronted with the urban heat island (UHI) phenomenon, which adds to the thermal stress experienced during hot spells. Focusing on the Paris area during the hot summer of 2003, we investigated the influence of heat waves on UHI intensit...
Chapter
Full-text available
We report on estimation of the solar energy potential in Greece using satellite- and ground-based observations in conjunction with radiative transfer model (RTM) simulations. Pyranometers of the Hellenic Network for Solar Energy and the National Observatory of Athens provide accurate insolation measurements and are used to verify 1- and 2-day ahead...
Poster
Full-text available
The downscaling of geostationary land surface temperature (LST) data is a recent advancement of thermal infrared (TIR) remote sensing that aims to address the current lack of high spatiotemporal LST data. Presently, the primary source of LST is satellite TIR remote sensing. However, due to technical constrains, TIR satellite sensors cannot offer LS...
Article
Full-text available
The Urban Heat Island (UHI) is an adverse environmental effect of urbanization that increases the energy demand of cities and impacts human health. The study of this effect for monitoring and mitigation purposes is crucial, but it is hampered by the lack of high spatiotemporal temperature data. This article presents the work undertaken for the impl...
Article
Full-text available
The downscaling of frequently-acquired geostationary Land Surface Temperature (LST) data can compensate the lack of high spatiotemporal LST data for urban climate studies. In order to be usable, the generated datasets must accurately reproduce the spatiotemporal features of the coarse-scale LST time series with greater spatial detail. This work con...
Poster
We present a sophisticated machine learning system for nowcasting high resolution solar irradiance spectra at the surface directly from satellite cloud and aerosol inputs. The system revolves around a state­of­the­art neural network (NN) trained on a large­scale (2.5 million record) look­up­table (LUT) of clear and cloudy sky radiative transfer sim...
Article
Full-text available
This paper reports on the development of a neural network (NN) model for instantaneous and accurate estimation of solar radiation spectra and budgets geared toward satellite cloud data using a 2.4. M record, high-spectral resolution look up table (LUT) generated with the radiative transfer model libRadtran. Two NN solvers, one for clear sky conditi...
Article
The increased temperatures of urban areas raise significant economic and health-related issues that affect more than half of the world population. This fact raised the need to assess and monitor the urban thermal environment and spurred the development of supportive information for decision-making, such as heat wave risk maps. Most of these require...
Article
A team from the National Observatory of Athens has made a significant contribution to the understanding of solar radiation at the surface of our planet. A novel real-time system developed by the team is able to reliably calculate short-term forecasts of the solar radiation spectrum across the globe from space. This output information and its derive...
Conference Paper
The importance of studying the Urban Heat Island (UHI) phenomenon has increased over the years due to the processes of urbanization and industrialization. Thermal remote sensing imagery has been extensively utilized for surface UHI (SUHI) studies. However, the low image acquisition frequency of most sensors limits its use. The Institute for Astrono...
Article
Measurements of air temperature and humidity in the urban canopy layer during July 2009 in 26 sites in Athens, Greece, allowed for the mapping of the hourly spatiotemporal evolution of the urban heat island (UHI) effect. City districts neighboring to the mountains to the east were the hottest during the afternoon, while being among the coolest duri...
Article
The Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing of the National Observatory (NOA/IAASARS) has developed a system that retrieves and downscales thermal remote sensing data obtained from Meteosat Second Generation—Spinning Enhanced Visible and Infrared Imager (MSG-SEVIRI) in real time. This activity aims to facilitate...
Conference Paper
In recent years, the importance of monitoring the spatial and temporal characteristics of the Surface Urban Heat Island (SUHI) phenomenon has increased due to the rapid growth of the urban population. A system for real time and online monitoring of the urban thermal environment, which exploits the fine temporal resolution (15 min) of Meteosat Secon...
Conference Paper
Wildfire is a significant hazard for sensitive areas, i.e. geographic regions where urban communities, installations for processing or storing hazardous chemical substances, valuable assets and monuments, or other important infrastructure meet or intermix with fire-prone wildlands. To avoid human casualties, organized evacuation of the population s...
Conference Paper
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BEYOND project (2013-2016, 2.3Meuro) funded under the FP7-REGPOT scheme is an initiative which aims to build a Centre of Excellence for Earth Observation (EO) based monitoring of natural disasters in south-eastern Europe (http://beyond-eocenter.eu/), established at the National Observatory of Athens (NOA). The project focuses on capacity building o...
Article
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The urban heat island (UHI) effect is one prominent form of localized anthropogenic climate modification. It represents a significant urban climate problem since it occurs in the layer of the atmosphere where almost all daily human activities take place. This paper presents the development of a high-resolution modeling system that could be used for...
Conference Paper
Full-text available
Magnetospheric processes play an important role in the Sun-Earth connection and space weather in general. The availability of multi-spacecraft observations can lead to the comprehensive characterization of magnetospheric processes and set the foundations for a deeper understanding and eventual forecasting of them. However, multi-spacecraft distribu...
Article
Although Earth observation data have been used in urban thermal applications extensively, these studies are often limited by the choices made in data selection, i.e., either using data with high spatial and low temporal resolution, or data with high temporal and low spatial resolution. The challenge of advancing the low spatial (3-5 km) resolution...
Article
Full-text available
The urban heat island (UHI) effect is one prominent form of localized anthropogenic climate modification. It represents a significant urban climate problem since it occurs in that layer of the atmosphere where almost all daily human activities take place. This paper presents the development of a high-resolution modelling system that could be used f...
Article
Full-text available
This paper presents the results of an operational nationwide burnt area mapping service realized over Greece for the years 2007-2011, through the implementation of the so-called BSM_NOA dedicated method developed at the National Observatory of Athens for post-fire recovery management. The method exploits multispectral satellite imagery, such as Lan...
Article
In this study, the Weather Research and Forecasting (WRF) model coupled with the Noah land surface model was tested over the city of Athens, Greece, during two selected days. Model results were compared against observations, revealing a satisfactory performance of the modeling system. According to the numerical simulation, the city of Athens exhibi...
Chapter
Full-text available
The urban heat island (UHI) is one of the most well known forms of localized, inadvertent anthropogenic climate modification. The study of urban climate problems, such as the UHI, is possible through the implementation of numerical models. In this context, numerical weather prediction models are thought to be a significant supporting tool with a wi...
Article
Full-text available
The average summer temperatures as well as the frequency and intensity of hot days and heat waves are expected to increase due to climate change. Motivated by this consequence, we propose a methodology to evaluate the monthly heat wave hazard and risk and its spatial distribution within large cities. A simple urban climate model with assimilated sa...
Article
Full-text available
Knowledge of the air and land surface temperature and their temporal and spatial variations within a city environment is of prime importance to the study of urban climate and human-environment interactions and to monitoring environmental changes due to urbanization. We present a number of air and land surface temperature products that have been pro...
Article
In this study, the potential of EO-1 Advanced Land Imager (ALI) radiometer for land cover and especially burnt area mapping from a single image analysis is investigated. Co-orbital imagery from the Landsat Thematic Mapper (TM) was also utilised for comparison purposes. Both images were acquired shortly after the suppression of a fire occurred durin...
Conference Paper
Full-text available
Data distribution and access are major issues in space sciences as they influence the degree of data exploitation. The project "Space-Data Routers" (SDR) has the aim of allowing space agencies, academic institutes and research centres to share space data generated by single or multiple missions, in an efficient, secure and automated manner. The app...
Conference Paper
Satellite platforms carrying thermal infrared sensors provide continuous monitoring of the land surface temperature (LST) distribution at a spatial resolution ranging from 3–5km to ∼100m. A suite of advanced methodologies for the study of the thermal urban environment using satellite images is being developed at National Observatory of Athens (NOA)...
Conference Paper
Full-text available
The National Observatory of Athens (NOA) has been established in Greece as a research institute offering, among others, operational services for disaster management of forest wildfires. In this paper the main activities of NOA related to fire monitoring and the Burn Scar Mapping damage assessment services are presented. The current capacities in de...
Conference Paper
Full-text available
In the Institute for Space Applications and Remote Sensing of the National Observatory of Athens (ISARS/NOA) volumes of Earth Observation images of different spectral and spatial resolutions are being processed on a systematic basis to derive thematic products that cover a wide spectrum of applications during and after wildfire crisis, from fire de...
Article
Comparison of thermal patterns across different cities is hampered by the lack of an appropriate methodology to extract the patterns and characterize them. What is more, increased attention by the urban climate community has been expressed to assess the magnitude and dynamics of the surface Urban Heat Island effect and to identify environmental imp...
Article
At the end of August 2009, wild fires ravaged the north-eastern fringes of Athens destroying invaluable forest wealth of the Greek capital. In this work, the impact of these fires on the air quality of Athens and surface radiation levels is examined. Satellite imagery, smoke dispersion modeling and meteorological data confirm the advection of smoke...
Conference Paper
Full-text available
Data sharing and access are major issues in space sciences, as they influence the degree of data exploitation. The project "Space-Data Routers", which was initiated recently, has the aim of allowing space agencies, academic institutes and research centres to share space-data generated by single or multiple missions, in an efficient, secure and auto...