Elias Symeonakis

Elias Symeonakis
Manchester Metropolitan University | MMU · Department of Natural Sciences

BEng, MSc, PhD

About

68
Publications
23,447
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Citations
Introduction
Elias Symeonakis is a remote sensing and GIS scientist. His research interests include the assessment of land cover, land use change and land degradation and their effect on ecosystem services provision.
Additional affiliations
June 2008 - September 2011
University of the Aegean
Position
  • Lecturer in Geographical Analysis
May 2005 - May 2007
The Commonwealth Scientific and Industrial Research Organisation
Position
  • PostDoc Position
May 2002 - June 2004
University of Valencia
Position
  • PostDoc Position

Publications

Publications (68)
Article
Full-text available
The Ngorongoro Conservation Area (NCA) of Tanzania, is globally significant for biodiversity conservation due to the presence of iconic fauna, and, since 1959 has been managed as a unique multiple land‐use areas to mutually benefit wildlife and indigenous residents. Understating vegetation dynamics and ongoing land cover change processes in protect...
Conference Paper
Full-text available
Pattern recognition remains a complex endeavour for ‘structure/function’ approaches to ecosystem functioning. It is particularly challenging in dryland environments where spatial heterogeneity is the inherent functional trait related with overland flow redistribution processes. Within this context, the concept of Soil Surface Components (SSCs) emer...
Article
Full-text available
With extinction rates far exceeding the natural background rate, reliable monitoring of wildlife populations has become crucial for adaptive management and conservation. Robust monitoring is often labor intensive with high economic costs, particularly in the case of those species that are subject to illegal poaching, such as elephants, which requir...
Article
Full-text available
Globally, about 250 Holocene volcanoes are either glacier-clad or have glaciers in close proximity. Interactions between volcanoes and glaciers are therefore common, and some of the most deadly (e.g., Nevado del Ruiz, 1985) and most costly (e.g., Eyjafjallajökull, 2010) eruptions of recent years were associated with glaciovolcanism. An improved und...
Article
Full-text available
The congeneric lagomorphs Lepus timidus and L. europaeus share allopatric distributions in many areas of Europe characterised by competitive exclusion and hybridisation. We investigated prospects for these species under climate change in northern England uplands. We created ensemble models predicting niche realisation for these species, influenced...
Article
The diagnosis of land degradation requires a deep understanding of ecosystem functioning and evolution. In dryland systems, in particular, research efforts must address the redistribution of scarce resources for vegetation, in a context of high spatial heterogeneity and non-linear response. This fact explains the prevalence of eco-hydrological pers...
Article
Full-text available
Savannahs are heterogeneous environments with an important role in supporting biodiversity and providing essential ecosystem services. Due to extensive land use/cover changes and subsequent land degradation, the provision of ecosystems services from savannahs has increasingly declined over recent years. Mapping the extent and the composition of sav...
Article
Full-text available
The Niger Delta Region is the largest river delta in Africa and features the fifth largest mangrove forest on Earth. It provides numerous ecosystem services to the local populations and holds a wealth of biodiversity. However, due to the oil and gas reserves and the explosion of human population it is under threat from overexploitation and degradat...
Article
Full-text available
Conservationists need detailed information on human population growth and distribution in areas adjacent to protected areas. This information can help determine land use/land cover changes (LULCC), which affect the quality and quantity of elephant habitat and, thus, elephant populations. We assessed the influence of human population trends on demog...
Article
Full-text available
Bush encroachment in African savannahs has been identified as a land degradation process, mainly due to the detrimental effect it has on small pastoralist communities. Mapping and monitoring the extent covered by the woody component in savannahs has therefore become the focus of recent remote sensing-based studies. This is mainly due to the large s...
Article
Full-text available
Time-series of vegetation greenness data, derived from Earth-observation imagery, have become a key source of information for studying large-scale environmental change. The ever increasing length of such series allows for a range of indicators to be derived and for increasingly complex analyses to be applied. This study presents an analysis of tren...
Poster
Full-text available
We present findings of impacts on ice-clad volcanoes via a systematic search of freely available satellite images for three locations in Chile, Alaska and Iceland. These include the formation of depressions and cauldrons, crevassing and tephra coverage.
Article
Full-text available
The selection of an appropriate map projection has a fundamental impact on the visualization and analysis of geographic information. Distortion is inevitable and the decision requires simultaneous consideration of several different factors; a process which can be confusing for many cartographers and GIS users. The last few decades have seen numerou...
Article
Full-text available
Special issue Mapping and Modelling Soil Erosion to Address Societal Challenges in a Changing World presents advances in interdisciplinary methodologies for the study of the soil erosion/land management/climate change nexus, with a focus on societal challenges linked to land degradation. Contribution of 22 research teams active in 17 countries all...
Article
Full-text available
The Bolivian Andes have experienced sustained and widespread glacier mass loss in recent decades. Glacier recession has been accompanied by the development of proglacial lakes, which pose a glacial lake outburst flood (GLOF) risk to downstream communities and infrastructure. Previous research has identified three potentially dangerous glacial lakes...
Data
Supplementary information to support paper in Natural Hazards entitled 'Modelling glacial lake outburst flood impacts in the Bolivian Andes' by Kougkoulos et al. (2018)
Article
Wetland ecosystems are key habitats for carbon sequestration, biodiversity and ecosystem services, yet in many they localities have been subject to modification or damage. In recent years, there has been increasing focus on effective management and, where possible, restoration of wetlands. Whilst this is highly laudable, practical implementation is...
Conference Paper
Full-text available
Los sistemas montañosos del Mediterráneo han sido modificados por la actividad agraria, especialmente con la construcción de terrazas de cultivo. Estas modifican la topografía y la distribución de los suelos, y, en consecuencia, la dinámica hidrológica y erosiva de las cuencas. el abandono de estas terrazas de cultivo durante la segunda mitad del s...
Article
Full-text available
Afromontane forests are biodiversity hotspots and provide essential ecosystem services. However, they are under pressure as a result of an expanding human population and the impact of climate change. In many instances electric fencing has become a necessary management strategy to protect forest integrity and reduce human-wildlife conflict. The impa...
Article
Full-text available
This paper looks at the periodic land use/cover (LUC) changes that occurred in Attica, Greece from 1991 to 2016. During this period, land transformations were mostly related to the artificial LUC categories; therefore, the aim was to map LUC with a high thematic resolution aimed at these specific categories, according to their density and continuit...
Article
Glacial Lake Outburst Floods (GLOFs) represent a significant threat in deglaciating environments, necessitating the development of GLOF hazard and risk assessment procedures. Here, we outline a Multi- Criteria Decision Analysis (MCDA) approach that can be used to rapidly identify potentially dangerous lakes in regions without existing tailored GLOF...
Data
Supplementary information to support paper in Science of the Total Environment entitled 'Use of multi-criteria decision analysis to identify potentially dangerous glacial lakes' by Kougkoulos et al. (2018)
Presentation
Full-text available
Glaciers of the Bolivian Andes have experienced areal shrinkage of ~43% in the last three decades, which has been accompanied by the development of proglacial lakes, some of which could generate glacial lake outburst floods (GLOFs). We provide the first attempt to assess GLOF risk in Bolivia, and model potential GLOF inundation. There are ~137 prog...
Conference Paper
Full-text available
Glaciers of the Bolivian Andes have experienced areal shrinkage of ∼43% in the last three decades, which has been accompanied by the development of proglacial lakes, some of which could generate glacial lake outburst floods (GLOFs). We provide the first attempt to assess GLOF risk in Bolivia, and model potential GLOF inundation. There are ∼137 prog...
Conference Paper
Full-text available
Glaciers represent an important water resource for Andean cities and mountain communities. However, a recent study has shown that Bolivian glaciers have shrunk by ∼43% in area over the last ∼30 years. If current rates of glacier recession are sustained then there could be potentially important consequences for downstream water supply, especially du...
Article
Full-text available
Accurately mapping savannah land cover at the regional scale can provide useful input to policy decision making efforts regarding, for example, bush control or overgrazing, as well as to global carbon emissions models. Recent attempts have employed Earth observation data, either from optical or radar sensors, and most commonly from the dry season w...
Article
Increasing attention is being directed at mapping the fractional woody cover of savannahs using Earth-observation data. In this study, we test the utility of Landsat TM/ ETM-based spectral-temporal variability metrics for mapping regional-scale woody cover in the Limpopo Province of South Africa, for 2010. We employ a machine learning framework to...
Poster
Full-text available
The Bolivian Andes have experienced a glacier areal shrinkage of ~43% in the last three decades. Glacier recession has been accompanied by the development of proglacial lakes, which can pose a glacial lake outburst flood (GLOF) hazard. GLOFs occur where the lake dam (ice, rock, moraine, or combination thereof) is breached, or overtopped, and thousa...
Poster
Full-text available
Glaciers across the world are thinning and receding in response to atmospheric warming. Glaciers tend to erode subglacial basins and deposit eroded materials around their margins as lateral-frontal terminal moraines. Recession into these basins and behind impounding moraines causes meltwater to pond as proglacial and supraglacial lakes. Consequentl...
Conference Paper
Full-text available
Glaciers across the world are thinning and receding in response to atmospheric warming. Glaciers tend to erode subglacial basins and deposit eroded materials around their margins as lateral-frontal terminal moraines. Recession into these basins and behind impounding moraines causes meltwater to pond as proglacial and supraglacial lakes. Consequentl...
Poster
Full-text available
Optimisation of savannah woody vegetation mapping using a combination of optical and thermal (Landsat) bands as well as SAR (ALOS PALSAR) data in an area of ~50,000km2 in the Northwest Province of South Africa.
Conference Paper
Full-text available
Mapping woody cover over large areas can only be effectively achieved using remote sensing data and techniques. The longest continuously operating Earth-observation program, the Landsat series, is now freely-available as an atmospherically corrected, cloud masked surface reflectance product. The availability and length of the Landsat archive is thu...
Conference Paper
Woody vegetation cover encroachment has repeatedly been identified as a threat to local economies and livelihoods in various sub-Saharan African dryland environments. We test a combination of multi-seasonal and multi-sensor data to optimise mapping of woody vegetation cover. Our test year is 2007 and the test site is the Northwest Province of South...
Article
Mapping woody cover over large areas can only be effectively achieved using remote sensing data and techniques. The longest continuously operating Earth-observation program, the Landsat series, is now freely-available as an atmospherically corrected, cloud masked surface reflectance product. The availability and length of the Landsat archive is thu...
Poster
Full-text available
The aim of this study was to employ random forests classification to map and monitor woody vegetation cover in the Northwest Province of South Africa over the last decades. Specific objectives include: (a) mapping of woody cover, other vegetated areas and non-vegetated areas every 4-to-5 years over the last 25 years; (b) identification of areas whe...
Presentation
Full-text available
Comparison between different model predictions of savannah fractional woody cover using Landsat dry and wet season optical data, as well as ALOS PALSAR-1 radar imagery in a random forest approach. Area of study: northern Kruger National Park, South Africa.
Article
The loss of forests along with the various types of shrubs in the Mediterranean region is seen as an important driver of climate change and has been repeatedly related with the observed land degradation and desertification in the region. Nevertheless, the extent of Woody Perennial Vegetation Cover (WPVC) and its density remain largely unclear. Here...
Poster
Full-text available
Accelerated soil erosion is the principal cause of soil degradation across the world. In Africa, it is seen as a serious problem creating negative impacts on agricultural production, infrastructure and water quality. Regarding the Mt Kenya region, specifically, soil erosion is a serious threat mainly due to unplanned and unsustainable practices lin...
Poster
Full-text available
Monitoring of land degradation in the island of Lesvos using a modification of the Medalus ESAI according to the multivariate statistical approach suggested by Salvati et al. (2009).
Article
Full-text available
Land degradation and desertification has been ranked as a major environmental and social issue for the coming decades. Thus, the observation and early detection of degradation is a primary objective for a number of scientific and policy organisations, with remote sensing methods being a candidate choice for the development of monitoring systems. Th...
Conference Paper
It is widely accepted that land degradation and desertification (LDD) are serious global threats to humans and the environment. Around a third of savannahs in Africa are affected by LDD processes that may lead to substantial declines in ecosystem functioning and services. Indirectly, LDD can be monitored using relevant indicators. The encroachment...
Article
In Europe, the most susceptible areas to land degradation and desertification (LDD) are found in the Mediterranean region. The present study focuses on the island of Lesvos (Greece) and maps the environmental sensitivity of the island to LDD between the years 1990 and 2000. Sensitivity is estimated with a modification of the MEDALUS Environmentally...
Article
The eruption of Novarupta within the Katmai Volcanic Cluster, south-west Alaska, in June 1912 was the most voluminous eruption of the twentieth century but the distal distribution of tephra deposition is inadequately quantified. We present new syntheses of published tephrostratigraphic studies and a large quantity of previously un-investigated hist...
Data
Raw data: ‘presence’ locations for all data types and data sources.
Data
Raw data: ‘absence’ locations for all data types.
Article
This study uses a series of Landsat images to map the main land-cover types on the Mediterranean island of Lesvos, Greece. We compare a single-year maximum likelihood classification (MLC) with a multi-temporal maximum likelihood classification (MTMLC) approach, with time-series class labels modelled using a first-order hidden Markov model comprisin...
Article
Full-text available
Soil erosion is considered to be one of the greatest environmental problems of sub-Saharan Africa. This paper investigates the advantages and disadvantages of modelling soil erosion at the continental scale and suggests an operational methodology for mapping and quantifying 10-daily water runoff and soil erosion over this scale using remote sensing...
Article
Interpolated rain-gauge data were compared to Meteosat-based precipitation estimates for sub-Saharan Africa. Validation was carried out using a dataset from a very dense gauge network in South Africa, on a point-to-pixel (PO-PI) as well as on a pixel-to-pixel (PI-PI) basis. Error criteria computed at the gauged pixels indicate that overall the inte...
Conference Paper
The present study examines the role of spatial metrics in the performance of a previously developed ANN model for predicting land use/cover changes. The model outputs are validated against a land-use change map, which has been derived from ortho-rectified aerial photographs, Landsat TM and Quckbird data. The results from the application of the mode...
Conference Paper
The number of rain-days per dekad (NRDD), a parameter of a modification of the widely used Soil Conservation Service (SCS) model, is estimated here over sub-Saharan Africa using two techniques: indicator kriging of rain-gauge measurements, and a method based on logistic regression between meteosat cold cloud duration (CCD) images and gauge measurem...
Article
The magnitude of the environmental and social consequences of soil erosion and land degradation in semiarid areas of the Mediterranean region has long been recognized and studied. This paper investigates the interrelationship between land use/cover (LULC) changes and land degradation using remotely sensed and ancillary data for southeastern Spain....
Article
Tsetse flies are the vectors of trypanosomes, the causal agent of trypanosomiasis, a widespread disease of livestock and people in Africa. Control of tsetse may open vast areas of land to livestock-keeping, with the associated benefits of developing mixed crop-livestock production systems. However, as well as possible positive impacts there are als...
Article
In Australia, the Commonwealth Scientific and Industrial Research Organisation (CSIRO), in partnership with the Australian Greenhouse Office (AGO), have developed a series of algorithms and methods which are being operationally used for large-scale land use/cover mapping and monitoring with remote sensing data. The present study gives an overview o...
Conference Paper
Land-use and land-cover changes (LUCC) are significant to a range of themes and issues central to the study of global environmental change. During the last decades, large scale detecting, measuring and monitoring of LUCC has been given a significant boost with the advent of remote sensing data. In Australia, time-series of remotely sensed satellite...
Article
A desertification monitoring system is developed that uses four indicators derived using continental-scale remotely sensed data: vegetation cover, rain use efficiency (RUE), surface run-off and soil erosion. These indicators were calculated on a dekadal time step for 1996. Vegetation cover was estimated using the Normalized Difference Vegetation In...
Conference Paper
Full-text available
The relationship between landuse/landcover (LULC) changes and land degradation in two Mediterranean sites is investigated using remotely sensed and ancillary data. The areas of study, the Xaló river catchment in the north of the Alicante province in southeast Spain and the Aegean island of Lesbos, Greece, have both been subjected to changes in LULC...
Article
The city of Athens, Greece, was given the go-ahead to host the 2004 Olympic Games in 1996. Considerable land cover/use changes (LUCC), principally conversions to urban land use from other types, associated with the preparation for the Games, have since taken place (e.g. sports and transport infrastructure, a new international airport, etc). The mea...
Article
Full-text available
During the last decades, large scale detecting, measuring and monitoring of land-use and land-cover changes (LUCC) has been given a significant boost with the advent of remote sensing data. In Australia, the Commonwealth Scientific and Industrial Research Organisation (CSIRO), in partnership with the Australian Greenhouse Office (AGO), have develop...

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Projects (6)
Project
A group based at University of Manchester, Manchester Metropolitan University, and University of Salford, with a shared interest in cryospheric research.