Poulicos Prastacos - Academia.edu (original) (raw)
Papers by Poulicos Prastacos
Biological Conservation, 2020
Although environmental heterogeneity (EH) has recently gained increasing attention, its connectio... more Although environmental heterogeneity (EH) has recently gained increasing attention, its connection to conservation planning still remains limited. We aim to assess the efficiency of Rao's quadratic entropy for measuring EH and conducting prioritization schemes. We focus on EH priority areas in the European Mediterranean biome and we estimate to which extent they are included in national and international protected area networks. We estimate Rao and Shannon EH indices for the bioclimatic and topographic variables of the CHELSA and the ENVIREM datasets. We use systematic conservation planning algorithms, for each dataset and for several moving window extends and we estimate the overlaps among the different schemes. The Rao and Shannon EH indices do not measure EH levels in a similar way and Shannon indices tend to overestimate EH comparing to Rao. The overlaps between the ENVIREM and CHELSA prioritization schemes are moderate (Jaccard index = 0.4-0.6) and not sensitive to the moving window extend. We consider only the priority areas that are identified as such by both independent datasets. One third of the EH priority areas are located in Greece, one forth in Italy and one fifth in France and Spain. Only one third of the EH priority areas are located within nationally designated protected areas and up to half are located in Key Biodiversity Areas and the Natura 2000 network. We conclude that Rao's methodology should be further used for environmental heterogeneity analyses. EH priority conservation areas are only partially included in protected area networks, mostly in mountainous areas.
A pilot regional Spatial Data Infrastructure (SDI) has recently been developed for the Heraklion ... more A pilot regional Spatial Data Infrastructure (SDI) has recently been developed for the Heraklion Prefecture in Crete, Greece, using Geographic Free and Open Source Software (GeoFOSS). This SDI is compatible with the geospatial standards and specifications introduced by the Open Geospatial Consortium (OGC) and it distributes the geospatial content on the web through widely accepted services (e.g., WMS, WFS, WCS and CSW). This paper presents the architecture, the components and the functionality of the Heraklion SDI. Specifically, it focuses on the map server, along with the services that provide accessibility to the data repositories, the spatial database server, the metadata and data catalog, the visualization tools and the web-client interface.
Cartographica: The International Journal for Geographic Information and Geovisualization, Dec 1, 2021
Les cartes historiques constituent un outil précieux pour la recherche en histoire, puisqu’elles ... more Les cartes historiques constituent un outil précieux pour la recherche en histoire, puisqu’elles sont dépositaires de renseignements sur l’espace qui reflètent la littératie géographique, l’idéologie et les préoccupations géopolitiques de l’époque où elles ont été établies – renseignements qui souvent ne sont pas fournis par d’autres sources. Les cartes historiques sont aussi un élément fondamental des applications dédiées au patrimoine culturel et aux sciences humaines numériques puisqu’elles donnent, en tant que cartes de base, une image de l’espace historique sur laquelle sont projetées d’autres ressources et le nom des lieux historiques, ce qui permet d’organiser et de géocoder diverses informations. Les cartes historiques devraient être abordées selon une approche sémantique qui considère les modèles et les normes de données des différentes disciplines liées au patrimoine culturel et aux sciences humaines numériques. C’est dans cet esprit que notre recherche poursuit des travaux antérieurs consistant à élaborer un profil d’application pour documenter les cartes historiques à partir du modèle du CIDOC et créer une base de données annotée de cartes historiques. Ce profil tient compte des concepts définitionnels de la carte et de ses relations aux objets, aux personnes, aux évènements et aux processus culturels. En vue de rassembler ces données et de les visualiser, une application web a été conçue à partir d’Arches, plateforme logicielle à code source ouvert destinée à la gestion du patrimoine culturel et compatible à la fois avec les normes du CIDOC et celles de l’information géographique.
WIT Transactions on Ecology and the Environment, Sep 10, 2003
... Falcón and Medina Muñoz [16], and Buhalis [22], provide examples of approaches to planning an... more ... Falcón and Medina Muñoz [16], and Buhalis [22], provide examples of approaches to planning and policy making considering both the problems of specific ... Tourism Development: Environmental and Community Issues, eds ... [29] Evans, MR, Newport, Rhode Island - America's first ...
Proceedings of SPIE, Aug 12, 2016
The INSPIRE directive, adopted by the EC in 2007 provides the guidelines for the organization of ... more The INSPIRE directive, adopted by the EC in 2007 provides the guidelines for the organization of all geographic data and is the basis for establishing a Spatial Data Infrastructure (SDI). Documentation of cultural heritage sites such as archeological areas, historic places and others is not a thematic area addressed in the directive. However, as discussed in this paper the directive can be extended to cover the documentation of these sites as well. The location of an archaeological area and its monuments, its legal status, the surrounding physical environment (NATURA protected areas), the protection zones around the site and the permitted development can be documented following the INSPIRE directive. Additionally, results of research carried out in these sites such as geophysical surveys, use of satellite images or topographical surveys can be also organized using the INSPIRE guidelines.
Transportation Research Record, 1991
In this study, a GIS tool is proposed for the support of technological risk management based on i... more In this study, a GIS tool is proposed for the support of technological risk management based on integration of moderate and high spatial resolution satellite imagery with in-situ vector data. A major technological accident scenario was developed for the region of Athens (Greece) in order to present the functionality of the GIS tool for the support of decision-making during the crisis, as well as for the assessment of the accident's impact to natural and human environment.
Cybergeo, May 10, 2017
The paper discusses the use of the Urban Atlas land use dataset for estimating spatial metrics to... more The paper discusses the use of the Urban Atlas land use dataset for estimating spatial metrics to analyse the form of urban areas. Using a cartographic generalization process the original Urban Atlas data are transformed by merging neighboring patches of the same land use class to a single patch thus forming larger land use patches. The resulting database is used for estimating spatial metrics and fractal dimension of nine Greek cities at the class and landscape level. Metrics estimated with this procedure reflect the land use distribution and sidestep the problem introduced by the high resolution of Urban Atlas data in which every land use patch is a city block. The metrics are used to analyze the form of the various cities and pinpoint differences and similarities among them. The results demonstrate that with spatial metrics and particularly with class metrics, it is possible to quantify the spatial heterogeneity and fragmentation of urbanization patterns, as well as, the structure and composition of land uses, thus obtaining insight on the main morphological characteristics of each city.
Environment and Planning A, Apr 1, 1986
This is the first of two papers presenting the structure and the empirical estimation of a planni... more This is the first of two papers presenting the structure and the empirical estimation of a planning land-use-transportation model for the San Francisco Bay Area. The model is based on random utility theory and considers in an integrated way the location of urban economic activity and housing, and urban travel. The model is formulated as a nonlinear optimization problem and is shown to result in expressions which are consistent with behavior at the individual level.
Environment and Planning A, Mar 1, 1986
This is the first of two papers presenting the structure and the empirical estimation of a planni... more This is the first of two papers presenting the structure and the empirical estimation of a planning land-use-transportation model for the San Francisco Bay Area. The model is based on random utility theory and considers in an integrated way the location of urban economic activity and housing, and urban travel. The model is formulated as a nonlinear optimization problem and is shown to result in expressions which are consistent with behavior at the individual level.
In this study, a GIS based decision support tool is proposed for the support of technological ris... more In this study, a GIS based decision support tool is proposed for the support of technological risk management by integrating moderate and high spatial resolution satellite imagery with in-situ vector data. The Advanced Very High Resolution Radiometer (AVHRR) on board the NOAA satellites has been used for the detection of fire as well as for the detection and Development of a Decision Support Tool 343
Blackwell Publishing Ltd eBooks, Jan 14, 2008
Abstract One of the main problems when applying a river flood model is the preparation of the nec... more Abstract One of the main problems when applying a river flood model is the preparation of the necessary input files and most important the visualization of the results. Most flood models have been developed years ago and input/output files follow rigid structures with ...
The Urban Atlas was developed by analyzing thousands of satellite images and provides detailed la... more The Urban Atlas was developed by analyzing thousands of satellite images and provides detailed land cover/usage data for all European cities with population more than 100,000. As it has been already mentioned, the Urban Atlas dataset can be downloaded from the EEA Urban Atlas website. Urban Atlas classification scheme identifies 20 different land use classes of which 17 van be considered built/artificial/ urban classes. The urban fabric (equivalent CORINE LC classes 1.1.1 and 1.1.2) are differentiated by their degree of imperviousness which is integrated from the Land Monitoring Core Service (LMCS) high resolution soil sealing layer. The production is based on a mix of photo-interpretation and classification with a 3-step validation involving a project internal quality assessment, independent experts and a technical review by the European Topic Centre Land Use and Spatial Information. The scale of CORINE LC is 1:100,000
... considered because the process revealed that much of the literature on Mediterranean tourism ... more ... considered because the process revealed that much of the literature on Mediterranean tourism policies was related or under the title of restructuring/rejuvenating strategies ... Pridham, 1999; Andriotis, 2001; Buhalis and Diamantis, 2001), and Cyprus and Malta (Lockhart, 1997 ...
274 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1981.This study is concerned wi... more 274 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1981.This study is concerned with the allocation of the transportation investments and their impact on the regional economy. Because the relationship between regional growth and the transport sector is highly complex, evaluation of alternative transportation plans should be performed with the aid of models which include among the decision variables not only the supply of transport, but also the level of national and regional economy.An economy-wide multilevel is developed with these characteristics. It is multiregional, multisectoral and dynamic. It consists of three different submodels--multiregional, distribution and network design--connected through an information flow consisting of shadow prices and allocative decisions.In addition to the allocation of the transportation budget the model estimates the magnitude of regional production, investment and consumption of the non-transportation sectors. Entropy maximizing techniques, resulting into gravity type distribution functions, are employed to determine the magnitude of the interregional flows.The large size of the model and its nonlinear character--zero-one variables, nonlinear entropy constraints--do not permit the application of direct solution methods. However, the model can be modified, so that decomposition algorithms can be applied. It is shown that the global optimal solution can be obtained by applying in two stages the Bender's Partitioning Algorithm. The computational experience with three test problems points out to a relatively rapid convergence.To test the applicability of the model to a real world problem the complete model was applied to Greece, a country with acute regional problems. The results of the model show that during the period 1975-1990 the interregional income differentials, as well as the national rate of growth will diminish. Since many of the input data are of questionable quantity additional tests are needed to confirm these trends.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD
Transportation Research Record, 1985
Most of the operational urban development models were designed 15 years ago and do not reflect th... more Most of the operational urban development models were designed 15 years ago and do not reflect the planning concerns of the 1980s. PLUM (Projective Land Use Model), the land use system developed for the Bay Area in 1970, suffers from conceptual and operational ...
RePEc: Research Papers in Economics, Aug 1, 2002
This paper discusses the application of space-time autoregressive integrated moving average (STAR... more This paper discusses the application of space-time autoregressive integrated moving average (STARIMA) methodology for representing traffic flow patterns. Traffic flow data are in the form of spatial time series and are collected at specific locations at constant intervals of time. Important spatial characteristics of the space-time process are incorporated in the STARIMA model through the use of weighting matrices estimated on the basis of the distances among the various locations where data are collected. These matrices distinguish the space-time approach from the vector autoregressive moving average (VARMA) methodology and enable the model builders to control the number of the parameters that have to be estimated. The proposed models can be used for short-term forecasting of space-time stationary traffic-flow processes and for assessing the impact of traffic-flow changes on other parts of the network. The three-stage iterative space-time model building procedure is illustrated using 7.5 min. average traffic flow data for a set of 25 loop-detectors located at roads that direct to the centre of the city of Athens, Greece. Data for two months with different traffic-flow characteristics are modelled in order to determine the stability of the parameter estimation.
Biological Conservation, 2020
Although environmental heterogeneity (EH) has recently gained increasing attention, its connectio... more Although environmental heterogeneity (EH) has recently gained increasing attention, its connection to conservation planning still remains limited. We aim to assess the efficiency of Rao's quadratic entropy for measuring EH and conducting prioritization schemes. We focus on EH priority areas in the European Mediterranean biome and we estimate to which extent they are included in national and international protected area networks. We estimate Rao and Shannon EH indices for the bioclimatic and topographic variables of the CHELSA and the ENVIREM datasets. We use systematic conservation planning algorithms, for each dataset and for several moving window extends and we estimate the overlaps among the different schemes. The Rao and Shannon EH indices do not measure EH levels in a similar way and Shannon indices tend to overestimate EH comparing to Rao. The overlaps between the ENVIREM and CHELSA prioritization schemes are moderate (Jaccard index = 0.4-0.6) and not sensitive to the moving window extend. We consider only the priority areas that are identified as such by both independent datasets. One third of the EH priority areas are located in Greece, one forth in Italy and one fifth in France and Spain. Only one third of the EH priority areas are located within nationally designated protected areas and up to half are located in Key Biodiversity Areas and the Natura 2000 network. We conclude that Rao's methodology should be further used for environmental heterogeneity analyses. EH priority conservation areas are only partially included in protected area networks, mostly in mountainous areas.
A pilot regional Spatial Data Infrastructure (SDI) has recently been developed for the Heraklion ... more A pilot regional Spatial Data Infrastructure (SDI) has recently been developed for the Heraklion Prefecture in Crete, Greece, using Geographic Free and Open Source Software (GeoFOSS). This SDI is compatible with the geospatial standards and specifications introduced by the Open Geospatial Consortium (OGC) and it distributes the geospatial content on the web through widely accepted services (e.g., WMS, WFS, WCS and CSW). This paper presents the architecture, the components and the functionality of the Heraklion SDI. Specifically, it focuses on the map server, along with the services that provide accessibility to the data repositories, the spatial database server, the metadata and data catalog, the visualization tools and the web-client interface.
Cartographica: The International Journal for Geographic Information and Geovisualization, Dec 1, 2021
Les cartes historiques constituent un outil précieux pour la recherche en histoire, puisqu’elles ... more Les cartes historiques constituent un outil précieux pour la recherche en histoire, puisqu’elles sont dépositaires de renseignements sur l’espace qui reflètent la littératie géographique, l’idéologie et les préoccupations géopolitiques de l’époque où elles ont été établies – renseignements qui souvent ne sont pas fournis par d’autres sources. Les cartes historiques sont aussi un élément fondamental des applications dédiées au patrimoine culturel et aux sciences humaines numériques puisqu’elles donnent, en tant que cartes de base, une image de l’espace historique sur laquelle sont projetées d’autres ressources et le nom des lieux historiques, ce qui permet d’organiser et de géocoder diverses informations. Les cartes historiques devraient être abordées selon une approche sémantique qui considère les modèles et les normes de données des différentes disciplines liées au patrimoine culturel et aux sciences humaines numériques. C’est dans cet esprit que notre recherche poursuit des travaux antérieurs consistant à élaborer un profil d’application pour documenter les cartes historiques à partir du modèle du CIDOC et créer une base de données annotée de cartes historiques. Ce profil tient compte des concepts définitionnels de la carte et de ses relations aux objets, aux personnes, aux évènements et aux processus culturels. En vue de rassembler ces données et de les visualiser, une application web a été conçue à partir d’Arches, plateforme logicielle à code source ouvert destinée à la gestion du patrimoine culturel et compatible à la fois avec les normes du CIDOC et celles de l’information géographique.
WIT Transactions on Ecology and the Environment, Sep 10, 2003
... Falcón and Medina Muñoz [16], and Buhalis [22], provide examples of approaches to planning an... more ... Falcón and Medina Muñoz [16], and Buhalis [22], provide examples of approaches to planning and policy making considering both the problems of specific ... Tourism Development: Environmental and Community Issues, eds ... [29] Evans, MR, Newport, Rhode Island - America's first ...
Proceedings of SPIE, Aug 12, 2016
The INSPIRE directive, adopted by the EC in 2007 provides the guidelines for the organization of ... more The INSPIRE directive, adopted by the EC in 2007 provides the guidelines for the organization of all geographic data and is the basis for establishing a Spatial Data Infrastructure (SDI). Documentation of cultural heritage sites such as archeological areas, historic places and others is not a thematic area addressed in the directive. However, as discussed in this paper the directive can be extended to cover the documentation of these sites as well. The location of an archaeological area and its monuments, its legal status, the surrounding physical environment (NATURA protected areas), the protection zones around the site and the permitted development can be documented following the INSPIRE directive. Additionally, results of research carried out in these sites such as geophysical surveys, use of satellite images or topographical surveys can be also organized using the INSPIRE guidelines.
Transportation Research Record, 1991
In this study, a GIS tool is proposed for the support of technological risk management based on i... more In this study, a GIS tool is proposed for the support of technological risk management based on integration of moderate and high spatial resolution satellite imagery with in-situ vector data. A major technological accident scenario was developed for the region of Athens (Greece) in order to present the functionality of the GIS tool for the support of decision-making during the crisis, as well as for the assessment of the accident's impact to natural and human environment.
Cybergeo, May 10, 2017
The paper discusses the use of the Urban Atlas land use dataset for estimating spatial metrics to... more The paper discusses the use of the Urban Atlas land use dataset for estimating spatial metrics to analyse the form of urban areas. Using a cartographic generalization process the original Urban Atlas data are transformed by merging neighboring patches of the same land use class to a single patch thus forming larger land use patches. The resulting database is used for estimating spatial metrics and fractal dimension of nine Greek cities at the class and landscape level. Metrics estimated with this procedure reflect the land use distribution and sidestep the problem introduced by the high resolution of Urban Atlas data in which every land use patch is a city block. The metrics are used to analyze the form of the various cities and pinpoint differences and similarities among them. The results demonstrate that with spatial metrics and particularly with class metrics, it is possible to quantify the spatial heterogeneity and fragmentation of urbanization patterns, as well as, the structure and composition of land uses, thus obtaining insight on the main morphological characteristics of each city.
Environment and Planning A, Apr 1, 1986
This is the first of two papers presenting the structure and the empirical estimation of a planni... more This is the first of two papers presenting the structure and the empirical estimation of a planning land-use-transportation model for the San Francisco Bay Area. The model is based on random utility theory and considers in an integrated way the location of urban economic activity and housing, and urban travel. The model is formulated as a nonlinear optimization problem and is shown to result in expressions which are consistent with behavior at the individual level.
Environment and Planning A, Mar 1, 1986
This is the first of two papers presenting the structure and the empirical estimation of a planni... more This is the first of two papers presenting the structure and the empirical estimation of a planning land-use-transportation model for the San Francisco Bay Area. The model is based on random utility theory and considers in an integrated way the location of urban economic activity and housing, and urban travel. The model is formulated as a nonlinear optimization problem and is shown to result in expressions which are consistent with behavior at the individual level.
In this study, a GIS based decision support tool is proposed for the support of technological ris... more In this study, a GIS based decision support tool is proposed for the support of technological risk management by integrating moderate and high spatial resolution satellite imagery with in-situ vector data. The Advanced Very High Resolution Radiometer (AVHRR) on board the NOAA satellites has been used for the detection of fire as well as for the detection and Development of a Decision Support Tool 343
Blackwell Publishing Ltd eBooks, Jan 14, 2008
Abstract One of the main problems when applying a river flood model is the preparation of the nec... more Abstract One of the main problems when applying a river flood model is the preparation of the necessary input files and most important the visualization of the results. Most flood models have been developed years ago and input/output files follow rigid structures with ...
The Urban Atlas was developed by analyzing thousands of satellite images and provides detailed la... more The Urban Atlas was developed by analyzing thousands of satellite images and provides detailed land cover/usage data for all European cities with population more than 100,000. As it has been already mentioned, the Urban Atlas dataset can be downloaded from the EEA Urban Atlas website. Urban Atlas classification scheme identifies 20 different land use classes of which 17 van be considered built/artificial/ urban classes. The urban fabric (equivalent CORINE LC classes 1.1.1 and 1.1.2) are differentiated by their degree of imperviousness which is integrated from the Land Monitoring Core Service (LMCS) high resolution soil sealing layer. The production is based on a mix of photo-interpretation and classification with a 3-step validation involving a project internal quality assessment, independent experts and a technical review by the European Topic Centre Land Use and Spatial Information. The scale of CORINE LC is 1:100,000
... considered because the process revealed that much of the literature on Mediterranean tourism ... more ... considered because the process revealed that much of the literature on Mediterranean tourism policies was related or under the title of restructuring/rejuvenating strategies ... Pridham, 1999; Andriotis, 2001; Buhalis and Diamantis, 2001), and Cyprus and Malta (Lockhart, 1997 ...
274 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1981.This study is concerned wi... more 274 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1981.This study is concerned with the allocation of the transportation investments and their impact on the regional economy. Because the relationship between regional growth and the transport sector is highly complex, evaluation of alternative transportation plans should be performed with the aid of models which include among the decision variables not only the supply of transport, but also the level of national and regional economy.An economy-wide multilevel is developed with these characteristics. It is multiregional, multisectoral and dynamic. It consists of three different submodels--multiregional, distribution and network design--connected through an information flow consisting of shadow prices and allocative decisions.In addition to the allocation of the transportation budget the model estimates the magnitude of regional production, investment and consumption of the non-transportation sectors. Entropy maximizing techniques, resulting into gravity type distribution functions, are employed to determine the magnitude of the interregional flows.The large size of the model and its nonlinear character--zero-one variables, nonlinear entropy constraints--do not permit the application of direct solution methods. However, the model can be modified, so that decomposition algorithms can be applied. It is shown that the global optimal solution can be obtained by applying in two stages the Bender's Partitioning Algorithm. The computational experience with three test problems points out to a relatively rapid convergence.To test the applicability of the model to a real world problem the complete model was applied to Greece, a country with acute regional problems. The results of the model show that during the period 1975-1990 the interregional income differentials, as well as the national rate of growth will diminish. Since many of the input data are of questionable quantity additional tests are needed to confirm these trends.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD
Transportation Research Record, 1985
Most of the operational urban development models were designed 15 years ago and do not reflect th... more Most of the operational urban development models were designed 15 years ago and do not reflect the planning concerns of the 1980s. PLUM (Projective Land Use Model), the land use system developed for the Bay Area in 1970, suffers from conceptual and operational ...
RePEc: Research Papers in Economics, Aug 1, 2002
This paper discusses the application of space-time autoregressive integrated moving average (STAR... more This paper discusses the application of space-time autoregressive integrated moving average (STARIMA) methodology for representing traffic flow patterns. Traffic flow data are in the form of spatial time series and are collected at specific locations at constant intervals of time. Important spatial characteristics of the space-time process are incorporated in the STARIMA model through the use of weighting matrices estimated on the basis of the distances among the various locations where data are collected. These matrices distinguish the space-time approach from the vector autoregressive moving average (VARMA) methodology and enable the model builders to control the number of the parameters that have to be estimated. The proposed models can be used for short-term forecasting of space-time stationary traffic-flow processes and for assessing the impact of traffic-flow changes on other parts of the network. The three-stage iterative space-time model building procedure is illustrated using 7.5 min. average traffic flow data for a set of 25 loop-detectors located at roads that direct to the centre of the city of Athens, Greece. Data for two months with different traffic-flow characteristics are modelled in order to determine the stability of the parameter estimation.