Stavros Roumelis | Harokopio University (original) (raw)
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Papers by Stavros Roumelis
This paper presents an automated method: a) to find the minimum number of viewpoints that overloo... more This paper presents an automated method: a) to find the minimum number of viewpoints that overlook a whole area and b) for the choice of a certain number of viewpoints to ensure the optimum visibility coverage. Specifically, was implemented a heuristic algorithm that "filters" the possible positions of the embossed surface, calculating the minimum number of viewpoints of the region of interest - for instance a forest. Then, using basic functions existing in the context of a GIS (Geographic Information System) and an evaluation algorithm, it is possible to select the best positions for a specific number of observatories. The proposed solution automates viewshed analysis for siting multiple viewpoints, reducing the time required for the solution of the maximum visibility coverage problem (in greek language)
Annals of GIS
The direct sunlight hides risks when a vehicle is moving on the roads during summer, as the posit... more The direct sunlight hides risks when a vehicle is moving on the roads during summer, as the position of the sun can block a large amount of drivers' visibility. This paper presents a methodology for validating/calibrating the primary results of a GIS-based spatiotemporal analysis of direct sunlight throughout a rural road with the use of spatial video. The study area is Rethimno, Greece, and the data used for this simulation is the topography, the road network and the sun position for a specific time during summer. The results of the simulation are illustrated on a risk map which indicates segments of roads at high risk in terms of direct sunlight. Moreover, the results have been tested, validated and calibrated in situ. A specialized car with a video camera and a Real Time Kinematic GPS on board was used to evaluate the primary results of the simulation. The ability of the spatial video to validate GIS-based modeling of moving vehicles is a valuable result of this work. Applying the analysis for long time periods, may lead to prevention policies adoption related to accidents of direct exposure to sunlight. Furthermore, this methodology could be an additional module in car navigation systems.
Annals of GIS
The direct sunlight hides risks when a vehicle is moving on the roads during summer, as the posit... more The direct sunlight hides risks when a vehicle is moving on the roads during summer, as the position of the sun can block a large amount of drivers' visibility. This paper presents a methodology for validating/calibrating the primary results of a GIS-based spatiotemporal analysis of direct sunlight throughout a rural road with the use of spatial video. The study area is Rethimno, Greece, and the data used for this simulation is the topography, the road network and the sun position for a specific time during summer. The results of the simulation are illustrated on a risk map which indicates segments of roads at high risk in terms of direct sunlight. Moreover, the results have been tested, validated and calibrated in situ. A specialized car with a video camera and a Real Time Kinematic GPS on board was used to evaluate the primary results of the simulation. The ability of the spatial video to validate GIS-based modeling of moving vehicles is a valuable result of this work. Applying the analysis for long time periods, may lead to prevention policies adoption related to accidents of direct exposure to sunlight. Furthermore, this methodology could be an additional module in car navigation systems.
Solid waste collection and transportation constitutes one of the most significant environmental a... more Solid waste collection and transportation constitutes one of the most significant environmental and socio-economic worldwide problems. The constant global population growth with a consequent increase in human needs leads to the aggravation of the phenomenon. The objective of this study is to determine the optimal routes for waste collection and transportation based on distance, time, fuel consumption and carbon dioxide (CO2) emission in Heraklion city, Crete, Greece. In order to find the optimal routes, a spatial model was created under the framework of Geographic Information System-based network analysis. The methodology includes data collection, model construction, analysis as well as the quantification of environmental, social and economic benefits, which includes the comparison of the current status with the obtained results from the modeling. The results from this study include the optimal routes generated by the methodology described above and their comparison with the existing practices. The comparison is carried out in quantitative terms, in order to ensure optimum management of economic and natural resources as well as human welfare.
Integrated and sustainable urban solid waste management is one of the most important environmenta... more Integrated and sustainable urban solid waste management is one of the most important environmental problems in Europe and worldwide. According to modern legislations and newly promoted practices and trends in Europe as well as internationally, a complex way of urban solid waste management tends to prevail. This management method combines the Processing Unit and the Sanitary Landfill for the Residues of the process. A variety of parameters and restrictions apply when planning the siting of Residue Sanitary Landfills (RSL). The urban solid waste management problem and specifically the matter of RSL siting is constantly becoming more and more important in developed and developing countries due to pressures coming from population and urbanization growth, continuously increasing living needs and many other factors. Technology evolution and especially Geoinformatics tools, such as Geographic Information Systems (GIS) and Remote Sensing (RS), constitute rather effective ways to approach and research issues like the problem of urban solid waste management and mainly the optimal delimitation of RSL.
The aim of this paper is to locate suitable – optimal areas that can be used for placing RSL in the island of Tinos, based on legislation, environmental, economic and social criteria. The methodology followed in this research effort is developed via Geographic Information Systems (GIS) by creating a spatial database which contains all the above-mentioned criteria. This research procedure includes an important number of different method trials. The result of this process indicate several places for placing RSL in Tinos Island.
The purpose of preparing this thesis is the development of GIS application for management of util... more The purpose of preparing this thesis is the development of GIS application for management of utilities network, and specific water distribution networks of Municipality of Volos via web services and by using open source software. The work focuses on the design and creation of Spatial Database which was implemented in PostgreSQL environment and spatial extension PostGIS, which is stored on the network elements both functionally and individual. This enabled centralized data management and providing all the functionality of a DBMS. Then developed Web Map Server to achieve the network management services via internet, and specifically be using GeoServer software, which received access to the data that was stored in the spatial database. Also developed Desktop and WEB application by using QuantumGIS and Mapbender software respectively to enable the users of the organization using for access to available data via the Map Server. The Desktop GIS software provides functionality to the user for information processing and retrieval of information which makes it an indispensable tool in managing the network. While the WEB client confined to information retrieval. This paper presents detailed technical and methodological issues and systematic description of the system-level logical and physical design. The choice of technology used (opensource) for the development of the system was such as to minimize - if possible - the cost and expertise requirements of users.
This paper presents an automated method: a) to find the minimum number of viewpoints that overloo... more This paper presents an automated method: a) to find the minimum number of viewpoints that overlook a whole area and b) for the choice of a certain number of viewpoints to ensure the optimum visibility coverage. Specifically, was implemented a heuristic algorithm that "filters" the possible positions of the embossed surface, calculating the minimum number of viewpoints of the region of interest - for instance a forest. Then, using basic functions existing in the context of a GIS (Geographic Information System) and an evaluation algorithm, it is possible to select the best positions for a specific number of observatories. The proposed solution automates viewshed analysis for siting multiple viewpoints, reducing the time required for the solution of the maximum visibility coverage problem (in greek language).
This paper presents an automated method: a) to find the minimum number of viewpoints that overloo... more This paper presents an automated method: a) to find the minimum number of viewpoints that overlook a whole area and b) for the choice of a certain number of viewpoints to ensure the optimum visibility coverage. Specifically, was implemented a heuristic algorithm that "filters" the possible positions of the embossed surface, calculating the minimum number of viewpoints of the region of interest - for instance a forest. Then, using basic functions existing in the context of a GIS (Geographic Information System) and an evaluation algorithm, it is possible to select the best positions for a specific number of observatories. The proposed solution automates viewshed analysis for siting multiple viewpoints, reducing the time required for the solution of the maximum visibility coverage problem (in greek language)
Annals of GIS
The direct sunlight hides risks when a vehicle is moving on the roads during summer, as the posit... more The direct sunlight hides risks when a vehicle is moving on the roads during summer, as the position of the sun can block a large amount of drivers' visibility. This paper presents a methodology for validating/calibrating the primary results of a GIS-based spatiotemporal analysis of direct sunlight throughout a rural road with the use of spatial video. The study area is Rethimno, Greece, and the data used for this simulation is the topography, the road network and the sun position for a specific time during summer. The results of the simulation are illustrated on a risk map which indicates segments of roads at high risk in terms of direct sunlight. Moreover, the results have been tested, validated and calibrated in situ. A specialized car with a video camera and a Real Time Kinematic GPS on board was used to evaluate the primary results of the simulation. The ability of the spatial video to validate GIS-based modeling of moving vehicles is a valuable result of this work. Applying the analysis for long time periods, may lead to prevention policies adoption related to accidents of direct exposure to sunlight. Furthermore, this methodology could be an additional module in car navigation systems.
Annals of GIS
The direct sunlight hides risks when a vehicle is moving on the roads during summer, as the posit... more The direct sunlight hides risks when a vehicle is moving on the roads during summer, as the position of the sun can block a large amount of drivers' visibility. This paper presents a methodology for validating/calibrating the primary results of a GIS-based spatiotemporal analysis of direct sunlight throughout a rural road with the use of spatial video. The study area is Rethimno, Greece, and the data used for this simulation is the topography, the road network and the sun position for a specific time during summer. The results of the simulation are illustrated on a risk map which indicates segments of roads at high risk in terms of direct sunlight. Moreover, the results have been tested, validated and calibrated in situ. A specialized car with a video camera and a Real Time Kinematic GPS on board was used to evaluate the primary results of the simulation. The ability of the spatial video to validate GIS-based modeling of moving vehicles is a valuable result of this work. Applying the analysis for long time periods, may lead to prevention policies adoption related to accidents of direct exposure to sunlight. Furthermore, this methodology could be an additional module in car navigation systems.
Solid waste collection and transportation constitutes one of the most significant environmental a... more Solid waste collection and transportation constitutes one of the most significant environmental and socio-economic worldwide problems. The constant global population growth with a consequent increase in human needs leads to the aggravation of the phenomenon. The objective of this study is to determine the optimal routes for waste collection and transportation based on distance, time, fuel consumption and carbon dioxide (CO2) emission in Heraklion city, Crete, Greece. In order to find the optimal routes, a spatial model was created under the framework of Geographic Information System-based network analysis. The methodology includes data collection, model construction, analysis as well as the quantification of environmental, social and economic benefits, which includes the comparison of the current status with the obtained results from the modeling. The results from this study include the optimal routes generated by the methodology described above and their comparison with the existing practices. The comparison is carried out in quantitative terms, in order to ensure optimum management of economic and natural resources as well as human welfare.
Integrated and sustainable urban solid waste management is one of the most important environmenta... more Integrated and sustainable urban solid waste management is one of the most important environmental problems in Europe and worldwide. According to modern legislations and newly promoted practices and trends in Europe as well as internationally, a complex way of urban solid waste management tends to prevail. This management method combines the Processing Unit and the Sanitary Landfill for the Residues of the process. A variety of parameters and restrictions apply when planning the siting of Residue Sanitary Landfills (RSL). The urban solid waste management problem and specifically the matter of RSL siting is constantly becoming more and more important in developed and developing countries due to pressures coming from population and urbanization growth, continuously increasing living needs and many other factors. Technology evolution and especially Geoinformatics tools, such as Geographic Information Systems (GIS) and Remote Sensing (RS), constitute rather effective ways to approach and research issues like the problem of urban solid waste management and mainly the optimal delimitation of RSL.
The aim of this paper is to locate suitable – optimal areas that can be used for placing RSL in the island of Tinos, based on legislation, environmental, economic and social criteria. The methodology followed in this research effort is developed via Geographic Information Systems (GIS) by creating a spatial database which contains all the above-mentioned criteria. This research procedure includes an important number of different method trials. The result of this process indicate several places for placing RSL in Tinos Island.
The purpose of preparing this thesis is the development of GIS application for management of util... more The purpose of preparing this thesis is the development of GIS application for management of utilities network, and specific water distribution networks of Municipality of Volos via web services and by using open source software. The work focuses on the design and creation of Spatial Database which was implemented in PostgreSQL environment and spatial extension PostGIS, which is stored on the network elements both functionally and individual. This enabled centralized data management and providing all the functionality of a DBMS. Then developed Web Map Server to achieve the network management services via internet, and specifically be using GeoServer software, which received access to the data that was stored in the spatial database. Also developed Desktop and WEB application by using QuantumGIS and Mapbender software respectively to enable the users of the organization using for access to available data via the Map Server. The Desktop GIS software provides functionality to the user for information processing and retrieval of information which makes it an indispensable tool in managing the network. While the WEB client confined to information retrieval. This paper presents detailed technical and methodological issues and systematic description of the system-level logical and physical design. The choice of technology used (opensource) for the development of the system was such as to minimize - if possible - the cost and expertise requirements of users.
This paper presents an automated method: a) to find the minimum number of viewpoints that overloo... more This paper presents an automated method: a) to find the minimum number of viewpoints that overlook a whole area and b) for the choice of a certain number of viewpoints to ensure the optimum visibility coverage. Specifically, was implemented a heuristic algorithm that "filters" the possible positions of the embossed surface, calculating the minimum number of viewpoints of the region of interest - for instance a forest. Then, using basic functions existing in the context of a GIS (Geographic Information System) and an evaluation algorithm, it is possible to select the best positions for a specific number of observatories. The proposed solution automates viewshed analysis for siting multiple viewpoints, reducing the time required for the solution of the maximum visibility coverage problem (in greek language).