Browsing by Author "Ulger, Nihat Enver"

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Citation Count: 4
Evaluation of national farmers' registry data in geo-information context: Case study of Trabzon, Turkey
(Academic Journals, 2011) Inan, Halil Ibrahim; Yomralioglu, Tahsin; Ulger, Nihat Enver
For the management of agricultural subsidies, information on farmers and farmland in Turkey is registered in the National Registry of Farmers (NRF) system. However, the system currently does not include any integrated spatial data. This hinders the population of necessary information on the actual agricultural land and thus, makes it impossible to correlate farmers' declaration with the actual agricultural land use. In this study, NRF data in two pilot areas in the province of Trabzon, Turkey were evaluated using digital cadastral data and ortho photo/image (ortho products). For the evaluation, the actual land use patterns of study areas were extracted from ortho products and then the areas of actual land use patterns were compared with the corresponding areas in the registries. As a result, it was determined that nearly 70% of the actual agricultural land was not registered in the NRF system. In addition, parcel based comparisons between registries and corresponding actual land use pattern uncovered considerable un-systematic anomaly between the reality of agricultural land use and farmers' declarations. It is suggested that the current system should be further developed in terms of geo-spatial data by integrating digital cadastral data and ortho products.
Citation Count: 3
GIS-BASED DRINKING WATER WATERSHED MANAGEMENT: A CASE STUDY OF THE GALYAN WATERSHED IN TURKEY
(Gh Asachi Technical Univ Iasi, 2015) Nisanci, Recep; Yildirim, Volkan; Yomralioglu, Tahsin; Ulger, Nihat Enver; Ozcelik, Ali Erdem
Water is one of the most important resources for sustainable development and human life. To meet future water needs, water resources and drinking water watersheds (DWWs) should be placed under protection using efficient methods. The spatial planning and spatial data has an important role in sustainable DWW management. Geographical Information Systems (GIS) is extensively used for spatial data production effectively based on spatial planning. The use of large-extended data, the analyzing of the maps which have no standard with data layered and the prevention of separation between administrative jurisdictions depending on administrative boundaries are possible by using GIS. In this paper since emphasized on the effectiveness of GIS in DWW management in the Galyan Drinking Water Watershed (GDWW), a sub-watershed of the Degirmendere Watershed, which supplies drinking water to Trabzon City, Turkey, is used as a case to study. The results of the study show that the agricultural chemicals and fertilizers used for hazelnut and cultivated farming to threaten the quality of drinking water in a significant part of the watershed (30%). Approximately 72% of the GDWW area is at risk of landslides, and the region as a whole is under threat because of widespread mining activities. The distances between the mining areas and the streams feeding the watershed were investigated. It was found that all the active ore beds are within 1,000 m of the rivers. Moreover, while the average distance of the ore beds to the streams is 253 m, the distance of the active ore beds is 357 m. According to the analysis results of the study, with GIS-based DWW management, decision makers can see where and what type of change has occurred in the area in use; therefore, it can provide requirements for the environmental and economical sustainability of the area in the future.