inproceedings by Zina Mitraka
Recent Improvements in the Dart Model for Atmosphere, Topography, Large Landscape, Chlorophyll Fluorescence, Satellite Image Inversion
Papers by Zina Mitraka
Copernicus for Urban Resilience in Europe: Intermediate results from the CURE project
<p>A major challenge for the urban community is the exploitation of Earth O... more <p>A major challenge for the urban community is the exploitation of Earth Observation (EO) in dealing with the multidimensional nature of urban sustainability towards enhancing urban resilience, particularly in the face of climate change. Here, we present how the H2020 funded project CURE (Copernicus for Urban Resilience in Europe) synergistically exploits Copernicus Core Services, to develop cross-cutting applications for urban resilience. CURE provides the urban planning community with spatially disaggregated environmental information at local scale, as well as a proof-of-concept that urban planning and management activities towards enhancing the resilience of cities can be supported by four Copernicus Core Services, namely, the Land Monitoring Service (CLMS), the Atmospheric Monitoring Service (CAMS), the Climate Change Service (C3S) and the Emergency Service (EMS).</p><p>CURE improved analysis methods for addressing specific dimensions of urban resilience, enabling its integration into operational services in the future, related to climate change adaptation and mitigation, healthy cities and social environments and energy and economy. Thus, CURE has the potential to reveal novel scientific insights on the exploitation of Copernicus for urban resilience and policy development, thereby generating new EO opportunities. CURE is built on Data and Information Access Services (DIAS), as s system integrating these cross-cutting applications, capable of supporting downstream services across Europe, addressing also its economic feasibility. CURE has resulted in information capacity presenting current state of cities against drivers (land use, green areas, energy use etc.) and pressures (pollution, emissions, floods, etc.) and help in assessing their overall impact (quality of life, health, economic damage, etc.) that will enable cities to prepare an evidence and knowledge based response (i.e., better plans, local actions and new policies).</p><p>The contribution of CURE mainly concerns: online platform for combining Core Services to support urban resilience planning; uniform data for large samples of urban areas both within region and across regions in Europe; consistent measurements across European cities, including synergies between Copernicus core products and third-party data; different approaches and models for better information on urban from and function at different spatial and temporal scales; and assimilation of users’ knowledge with technical data and benchmarking; fostering of innovation. The innovation potential of CURE lies on the exploitation of the Copernicus offer in the domain of urban resilience, by developing cross-cutting applications combining products from CLMS, CAMS, C3S and EMS with third-party data, as well as by developing a system for integrating these applications, enabling its incorporation into operational applications and downstream services in the future.</p><p>More information on CURE evolution at: http://cure-copernicus.eu</p>
Local scale surface temperature estimation by downscaling satellite thermal infrared observations using neural networks
宇宙からの人為的熱流束推定のための新しいアプローチ【Powered by NICT】
IEEE Conference Proceedings, 2016
EGU General Assembly Conference Abstracts, Apr 1, 2016
H2020-Space project URBANFLUXES (URBan ANthrpogenic heat FLUX from Earth observation Satellites) ... more H2020-Space project URBANFLUXES (URBan ANthrpogenic heat FLUX from Earth observation Satellites) investigates the potential of Copernicus Sentinels to retrieve anthropogenic heat flux, as a key component of the Urban Energy Budget (UEB). URBANFLUXES advances the current knowledge of the impacts of UEB fluxes on urban heat island and consequently on energy consumption in cities. This will lead to the development of tools and strategies to mitigate these effects, improving thermal comfort and energy efficiency. In URBANFLUXES, the anthropogenic heat flux is estimated as a residual of UEB. Therefore, the rest UEB components, namely, the net all-wave radiation, the net change in heat storage and the turbulent sensible and latent heat fluxes are independently estimated from Earth Observation (EO), whereas the advection term is included in the error of the anthropogenic heat flux estimation from the UEB closure. The project exploits Sentinels observations, which provide improved data quality, coverage and revisit times and increase the value of EO data for scientific work and future emerging applications. These observations can reveal novel scientific insights for the detection and monitoring of the spatial distribution of the urban energy budget fluxes in cities, thereby generating new EO opportunities. URBANFLUXES thus exploits the European capacity for space-borne observations to enable the development of operational services in the field of urban environmental monitoring and energy efficiency in cities.
Copernicus for Urban Resilience in Europe: Final results from the CURE project
A major challenge for the urban community is the exploitation of Earth Observation intelligence i... more A major challenge for the urban community is the exploitation of Earth Observation intelligence in managing in the multidimensional nature of urban sustainability towards enhancing urban resilience, particularly in relation to the challenges of climate change. This study presents the ways in which the H2020 funded project CURE (Copernicus for Urban Resilience in Europe) synergistically exploited Copernicus Core Services to develop cross-cutting applications supporting urban resilience. CURE provided the urban planning community with spatially disaggregated environmental intelligence at a local scale, as well as a proof-of-concept that urban planning and management strategies development enhancing the resilience of cities can be supported by Copernicus Core Services. Here, we demonstrate the technical operational feasibility of an umbrella cross-cutting system on urban resilience, consisting of 11 specific applications. These use Copernicus core products from at least two services each as main input information, reflect the main urban sustainability dimensions and are relevant to user needs, which were identified based on a strong stakeholders’ engagement. As a result, CURE is built on Data and Information Access Services (DIAS), as a system integrating these cross-cutting applications, capable of supporting downstream services across Europe, enabling its incorporation into operational Copernicus products portfolio in the future and also addressing its economic feasibility. For more information on CURE: http://cure-copernicus.eu
AGUFM, Dec 1, 2016
H2020-Space project URBANFLUXES (URBan ANthrpogenic heat FLUX from Earth observation Satellites) ... more H2020-Space project URBANFLUXES (URBan ANthrpogenic heat FLUX from Earth observation Satellites) investigates the potential of Copernicus Sentinels to retrieve anthropogenic heat flux, as a key component of the Urban Energy Budget (UEB). URBANFLUXES advances the current knowledge of the impacts of UEB fluxes on urban heat island and consequently on energy consumption in cities. This will lead to the development of tools and strategies to mitigate these effects, improving thermal comfort and energy efficiency. In URBANFLUXES, the anthropogenic heat flux is estimated as a residual of UEB. Therefore, the rest UEB components, namely, the net all-wave radiation, the net change in heat storage and the turbulent sensible and latent heat fluxes are independently estimated from Earth Observation (EO), whereas the advection term is included in the error of the anthropogenic heat flux estimation from the UEB closure. The project exploits Sentinels observations, which provide improved data quality, coverage and revisit times and increase the value of EO data for scientific work and future emerging applications. These observations can reveal novel scientific insights for the detection and monitoring of the spatial distribution of the urban energy budget fluxes in cities, thereby generating new EO opportunities. URBANFLUXES thus exploits the European capacity for space-borne observations to enable the development of operational services in the field of urban environmental monitoring and energy efficiency in cities.
32nd Conf. on Agricultural and Forest Meteorology/22nd Symp. Boundary Layers and Turbulence/ Third Conf. on Atmospheric Biogeosciences (20 – 24 June, 2016), Jun 22, 2016
H2020-Space project URBANFLUXES (URBan ANthrpogenic heat FLUX from Earth observation Satellites) ... more H2020-Space project URBANFLUXES (URBan ANthrpogenic heat FLUX from Earth observation Satellites) investigates the potential of Copernicus Sentinels to retrieve anthropogenic heat flux, as a key component of the Urban Energy Budget (UEB). URBANFLUXES advances the current knowledge of the impacts of UEB fluxes on urban heat island and consequently on energy consumption in cities. This will lead to the development of tools and strategies to mitigate these effects, improving thermal comfort and energy efficiency. In URBANFLUXES, the anthropogenic heat flux is estimated as a residual of UEB. Therefore, the rest UEB components, namely, the net all-wave radiation, the net change in heat storage and the turbulent sensible and latent heat fluxes are independently estimated from Earth Observation (EO), whereas the advection term is included in the error of the anthropogenic heat flux estimation from the UEB closure. The project exploits Sentinels observations, which provide improved data quality, coverage and revisit times and increase the value of EO data for scientific work and future emerging applications. These observations can reveal novel scientific insights for the detection and monitoring of the spatial distribution of the urban energy budget fluxes in cities, thereby generating new EO opportunities. URBANFLUXES thus exploits the European capacity for space-borne observations to enable the development of operational services in the field of urban environmental monitoring and energy efficiency in cities.
Satellite Based Estimation of Urban Surface Emissivity with the Use of Sub-Pixel Classification Techniques
Springer eBooks, Jun 1, 2012
ABSTRACT Information about the spatial distribution of urban surface emissivity is essential for ... more ABSTRACT Information about the spatial distribution of urban surface emissivity is essential for surface temperature estimation which is an important component of urban microclimate and it is critical in many applications, like turbulent sensible and latent heat fluxes estimation, energy budget, urban canopy modeling, bio-climatic studies and urban planning. The proposed method presents an improvement in emissivity estimation as compared with existing methods, such as the look-up table approach, wherein emissivity and other biophysical parameters are assigned to grid cells based on land cover types. The basic premise of this method is a sub-pixel classification of urban surface into vegetation, impervious and soil, based on spectral mixture analysis. The proposed approach was applied to Landsat-7 ETM + observations over the area of Athens, Greece. Spatial distributions of surface emissivity, as well as land surface temperature in the spectral region of 10.4–12.5 μm were derived. ASTER (Advanced Spectral Reflection and Emission Radiometer) emissivity and surface temperature products were used for evaluation.
Detailed urban surface characterization using spectra from enhanced spatial resolution Sentinel-2 imagery and a hierarchical multiple endmember spectral mixture analysis approach
Journal of Applied Remote Sensing, Feb 7, 2019
Abstract. Detailed mapping of urban surfaces is one of the most challenging tasks in remote sensi... more Abstract. Detailed mapping of urban surfaces is one of the most challenging tasks in remote sensing due to the three-dimensional structure of cities, spatial diversity, and material spectral variability. Satellite urban applications demand better spatial, spectral, and temporal resolution, although there are strict technical constraints among them. Therefore, the development of sophisticated methods that exploit both high spectral and spatial data sources becomes necessary. A hierarchical multiple endmember spectral mixture analysis (MESMA) approach is developed and applied on Sentinel-2 imagery for the detailed quantification of the urban land cover, taking advantage of Worldview-2 high spatial resolution. The case study is the urban and peri-urban area of Heraklion, Greece. The area to point regression kriging (ATPRK) method is applied to downscale Sentinel-2 bands from 10 and 20 m to 2 m (WorldView-2 spatial resolution) and create a spectral library (SL) of urban materials, which contain 180 separate spectra. The urban SL is then used in the developed hierarchical MESMA approach to estimate the abundances of 11 urban land cover classes based on the original Sentinel-2 image. The estimated land cover fractions validate against a very high-resolution (1 m) land cover map of the area. It is proved that the complexity of the urban land cover can be efficiently investigated by the proposed methodology. Error analysis shows good accuracy of the results in all estimated class fractions. Moreover, the good validation results lead to the conclusion that ATPRK fusion algorithm between Sentinel-2 and WorldView-2 bands produced reliable urban material spectra, capable for advanced spectral analysis on Sentinel-2 imagery. The developed methodology is easily transferable to other cities since it is based exclusively on earth observation data and is suitable for multiple urban applications related to urban climate, urban sprawl, and urban regeneration.
Earth Observation (EO) systems and the advances in remote sensing technology increase the opportu... more Earth Observation (EO) systems and the advances in remote sensing technology increase the opportunities for monitoring the thermal behaviour of cities. Several parameters related to the urban climate can be quantified from EO data products, providing valuable support for advanced urban studies and climate modelling. In this study, remote sensing techniques are applied to derive quantitative information necessary to identify the Local Climate Zones (LCZ). Parameters like the pervious and impervious surface fraction, the surface albedo, the building density, the mean building/tree height and the sky view factor are quantified and used to map possible zones with homogeneous thermal characteristics, considered as LCZ.
Presently, there is a growing need for information suitable to effectively characterize the Urban... more Presently, there is a growing need for information suitable to effectively characterize the Urban Energy Budget (UEB) and, hence, to properly estimate the magnitude of the anthropogenic heat flux Q F . Indeed, a precise knowledge of Q Fwhose implications for urban planners are still prone to large uncertainties -is fundamental for implementing effective strategies to improve thermal comfort and energy efficiency. To address this challenging issue, the Horizon 2020 URBANFLUXES project aims at developing a novel methodology for accurately estimating the different terms of the UEB based on the use of Earth Observation (EO) data and, hence, at reliably characterizing the Q F spatiotemporal patterns and its implications on urban climate. In this paper, we aim at giving an overview of the EO-based products which have been identified as the most useful in the framework of the considered study. In particular, the suite which has been implemented so far in the first phase of the project includes biophysical parameters, morphology parameters as well as land-cover maps.
Remote Sensing, Oct 23, 2015
The Sentinel missions have been designed to support the operational services of the Copernicus pr... more The Sentinel missions have been designed to support the operational services of the Copernicus program, ensuring long-term availability of data for a wide range of spectral, spatial and temporal resolutions. In particular, Sentinel-2 (S-2) data with improved high spatial resolution and higher revisit frequency (five days with the pair of satellites in operation) will play a fundamental role in recording land cover types and monitoring land cover changes at regular intervals. Nevertheless, cloud coverage usually hinders the time series availability and consequently the continuous land surface monitoring. In an attempt to alleviate this limitation, the synergistic use of instruments with different features is investigated, aiming at the future synergy of the S-2 MultiSpectral Instrument (MSI) and Sentinel-3 (S-3) Ocean and Land Colour Instrument (OLCI). To that end, an unmixing model is proposed with the intention of integrating the benefits of the two Sentinel missions, when both in orbit, in one composite image. The main goal is to fill the data gaps in the S-2 record, based on the more frequent information of the S-3 time series. The proposed fusion model has been applied on MODIS (MOD09GA L2G) and SPOT4 (Take 5) data and the experimental results have demonstrated that the approach has high potential. However, the different acquisition characteristics of the sensors, i.e. illumination and viewing geometry, should be
Theoretical and Applied Climatology, Oct 15, 2018
Global land surface albedo maps from MODIS using the Google Earth Engine
EGU General Assembly Conference Abstracts, Apr 1, 2016
ESA Living Planet Symposium, Dec 1, 2013
The series of upcoming Sentinel constellations is expected to provide satellite imagery of major ... more The series of upcoming Sentinel constellations is expected to provide satellite imagery of major significance for Earth-observation (EO) studies. The accuracy and the enhanced characteristics of the data will play an essential role for monitoring and mapping the land surface. Two critical issues in such-studies are how to deal with the heterogeneity of the landscape and how to treat the temporal changes, both of which usually require information of high spatial, spectral and temporal resolution. Taking these matters under consideration, the synergistic use of the advanced features of Sentinel-2 (S-2) and Sentinel-3 (S-3) optical sensors is investigated in this paper. In particular, an unmixing-based fusion technique is proposed with the aim of integrating in a composite image the high spatial resolution of S-2 (up to 10m) and the high spectral resolution of S-3 (21 bands). The fused products are intended to benefit significantly the land monitoring applications such as land-use change, forest cover, photosynthetic activity, soil quality, etc.
The global blue-sky albedo change between 2000 - 2015 seen from MODIS
AGU Fall Meeting Abstracts, Dec 1, 2016
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inproceedings by Zina Mitraka
Papers by Zina Mitraka