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Featured researches published by Tayfun Cay.


Environmental Monitoring and Assessment | 2010

Selection of MSW landfill site for Konya, Turkey using GIS and multi-criteria evaluation.

Bilgehan Nas; Tayfun Cay; Fatih Iscan; Ali Berktay

Landfill is a common solution for the final disposal of municipal solid waste (MSW) in Turkey. Landfill siting is an extremely difficult task to accomplish because the site selection process depends on different factors and regulations. To ensure that an appropriate site is chosen, a systematic process should be developed and followed. Unsuccessful landfill siting is typically the result of strong public opposition. In this study, candidate sites for an appropriate landfill area in Cumra County of Konya City are determined by using the integration of geographic information systems (GIS) and multi-criteria evaluation (MCE). ArcGIS 9.0 software and its extensions were used as the GIS tool since it is able to perform suitability analysis using MCE analysis. To identify appropriate landfill areas in the Cumra district, eight input map layers including proximity to municipal and local wells and irrigational canals, distance from transportation routes and rails, distance from archaeological sites, distance from urban areas, land use/land cover, and land slope are used in constraint mapping. A final map was generated which identifies regions showing suitability for the location of the landfill site. According to the map, 6.8% of the study area is most suitable, 15.7% is suitable, 10.4% is moderately suitable, 25.8% is poorly suitable, and 41.3% is unsuitable. At the end of the analyses, three candidate sites are determined. The selection of the final MSW landfill site, however, requires further field research.


Expert Systems With Applications | 2011

Fuzzy expert system for land reallocation in land consolidation

Tayfun Cay; Fatih Iscan

One of the most important steps of land consolidation projects is land reallocation studies. In Turkey, reallocation studies carried out in the scope of land consolidation projects are made according to farmer preferences (interviews). In addition to interview-based land reallocation model, mathematical models have been used in the previous optimization studies for reallocation procedure. Recently, fuzzy logic method, which is capable of modeling human mindset and used when other forms of mathematical models cannot be developed, has also been applied to the field of geomatic engineering, as well as in other engineering branches. This study examined the applicability of a fuzzy logic method at the reallocation stage of land consolidation study, where development of an accurate mathematical model was not possible. The results obtained from the fuzzy logic-based land reallocation model were compared with those obtained from the interview-based land reallocation model. Farmers were surveyed to determine which land reallocation model they preferred. The results indicate that 80.5% of the participant landholdings were satisfied with the fuzzy logic-based reallocation land model, while 50% were with the interview-based land reallocation model.


Water Environment Research | 2009

Spatial and temporal groundwater level variation geostatistical modeling in the city of Konya, Turkey.

Tayfun Cay; Mevlut Uyan

Groundwater is one of the most important resources used for drinking and utility and irrigation purposes in the city of Konya, Turkey, as in many areas. The purpose of this study is to evaluate spatial and temporal changes in the level of groundwater by using geostatistical methods based on data from 91 groundwater wells during the period 1999 to 2003. Geostatistical methods have been used widely as a convenient tool to make decisions on the management of groundwater levels. To evaluate the spatial and temporal changes in the level of the groundwater, a vector-based geographic information system software package, ArcGIS 9.1 (Environmental Systems Research Institute, Redlands, California), was used for the application of an ordinary kriging method, with cross-validation leading to the estimation of groundwater levels. The average value of variogram (spherical model) for the spatial analysis was approximately 2150 m. Results of ordinary kriging for groundwater level drops were underestimated by 17%. Cross-validation errors were within an acceptable level. The kriging model also helps to detect risk-prone areas for groundwater abstraction.


Computers and Electronics in Agriculture | 2016

A new approach for automating land partitioning using binary search and Delaunay triangulation

Hüseyin Haklı; Harun Uğuz; Tayfun Cay

Display Omitted This paper proposes a new approach for automating land partitioning.Binary search and Delaunay triangulation is used by proposed algorithm.The time analysis of the proposed algorithm are evaluated on a study area.The results shows that the proposed approach fastens the land partitioning process.This study has set the stage for enactment of the ideal plan of land partitioning. One of the most important, yet time-consuming steps of the land consolidation process, which is related to pooling fragmented lands together, is the production of land partitioning plans. After the land redistribution process is finished, the land partitioning process begins. In that process, the locations of parcels within the blocks are determined. Due to the non-uniform geometric shapes of the blocks, the areas of the parcels cannot be divided directly. The production of an ideal land partitioning plan is not suitable automatically unless a quick, accurate process to divide the lands is secured. In this study, production of a pre-land partitioning plan is realized using both the binary search method and the Delaunay triangulation method, taking into consideration shape, size, value and road access criteria. The result of the experimental study shows that the proposed approach for dividing the parcels makes the process take place more quickly. Thus, a solid base for creating an automatic land partitioning plan-one that is closest to an ideal plan-will be provided with this study.


international conference on application of information and communication technologies | 2013

Intersection road accident analysis using geographical information systems: Antalya (Turkey) example

Ela Ertunç; Omer Mutluoglu; Tayfun Cay

Since the basis of traffic safety study is based on the exact information, exact information is reached in order to minimize traffic accidents. Geographic Information Systems (GIS) are performed related to an accident data collection, storing, statistical analyzing, visualizing and testing of results as soon as possible and a detailed manner. In this study, a database has been created with Arcmap-10 software using fatal-injury traffic accident datas at intersections in Antalya City Center between 2009 and 2010 years. Statistical evaluations of accidents were conducted in both visual and graphics using these traffic accident datas on a satellite map with ArcMap-10 software. Hot spots for intersection accident were determined in GIS.


Land Use Policy | 2013

Evaluation of reallocation criteria in land consolidation studies using the Analytic Hierarchy Process (AHP)

Tayfun Cay; Mevlut Uyan


Land Use Policy | 2010

Effects of different land reallocation models on the success of land consolidation projects: Social and economic approaches

Tayfun Cay; Turgut Ayten; Fatih Iscan


Computers and Electronics in Agriculture | 2013

A Spatial Decision Support System design for land reallocation: A case study in Turkey

Mevlut Uyan; Tayfun Cay; Oguzkagan Akcakaya


Environmental and Ecological Statistics | 2013

Spatial analyses of groundwater level differences using geostatistical modeling

Mevlut Uyan; Tayfun Cay


Computers and Electronics in Agriculture | 2015

Comparison of designed different land reallocation models in land consolidation

Mevlut Uyan; Tayfun Cay; Yaşar İnceyol; Hüseyin Haklı

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