WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7150

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  • Article
    Citation - WoS: 8
    Citation - Scopus: 9
    Comprehensive Comparison of Different Gridded Precipitation Products Over Geographic Regions of Türkiye
    (Spie-soc Photo-optical instrumentation Engineers, 2024) Gündüz, Orhan; Sahin, Onur Gungor; Gunduz, Orhan; 03.07. Department of Environmental Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    The traditionally used rain gauge stations provide the most reliable data on the spatiotemporal distribution of precipitation; however, they are limited in space and time. As an alternative to field observations, the gridded precipitation products (GPPs) offered by remote sensing missions are widely used. On account of the uncertainties associated with the GPPs, they have to be quality-checked for confidence in application over the region of interest. Although accuracy assessment of precipitation data is a common task, there is a gap in the literature regarding a comprehensive assessment of the currently available GPPs. In this study, 14 GPPs were used to investigate their performance in catching the spatio-temporal characteristics of precipitation over geographic regions of T & uuml;rkiye. According to the results, integrated multi-satellite retrievals for Global Precipitation Measurement (IMERG), multi-source weighted-ensemble precipitation (MSWEP), and Tropical Rainfall Measuring Mission (TRMM) show better performance on monthly and annual scales while on the climatology scale, CHELSA, Climate Hazards Group Infrared Precipitation with Station, ERA5, and ERA5-Land also manifest better performance. The mean monthly correlation over Aegean Region (AEG), Marmara Region (MAR), Central Anatolian Region (CAR), Mediterranean Region (MED), Black Sea Region (BSR), East Anatolian Region (EAR), and South East Anatolian Region (SEA) are 0.77, 0.81, 0.77, 0.80, 0.79, 0.77, and 0.77, respectively. The annual assessment suggests that over the MAR, CAR, MED, and SEA, the IMERG mission performs very well. While TRMM showcases its best performance in the AEG, MED, BSR, and EAR, MSWEP performs well in the BSR and SEA Region. Overall, taking the country-average results into account, it can be stated that among the used GPPs, TRMM, MSWEP, and IMERG yield the best results for T & uuml;rkiye as a whole.
  • Review
    Citation - WoS: 1
    Equitable Accessibility of Public Open Spaces: a Comparison of Measurement Methods in Metropolitan Area of Izmir, Türkiye
    (Routledge Journals, Taylor & Francis Ltd, 2024) Şenol, Fatma; Kaya, Ilgi Atay; 02.03. Department of City and Regional Planning; 02. Faculty of Architecture; 01. Izmir Institute of Technology
    The accessibility of public open spaces (POS) is assessed by comparing the characteristics of these spaces with the population characteristics across various urban units. Known as "equity mapping" of POS, this method identifies and addresses spatial inequities and environmental justice issues related to POS accessibility. However, research in this area has advanced further in countries with data availability at small spatial scales (e.g. census tracts), enabling the measurement of accessibility within walking distances. To address the challenges of conducting research in data-limited contexts, this case study in Izmir (T & uuml;rkiye) investigates which spatial analyses can facilitate the development of a comprehensive equity mapping of POS accessibility. T & uuml;rkiye has demographic data available at the neighbourhood level, including age, gender, and education, but lacks data on income, race/ethnicity, and other characteristics commonly used in mainstream research. This paper assumes that children, the elderly, and low-education groups (a proxy for income level) have a greater need for POS. It explores three forms of overlay analyses: feature-based, raster-based, and fishnet-based. Additionally, it examines the metropolitan area and its sub-regions as terrains with different POS accessibility. The results highlight the Centre as having the weakest POS accessibility in neighbourhoods with high child ratios and low education levels. The fishnet-based density analysis offers a finer lens for identifying the locations of priority areas for POS provisioning, even within neighbourhoods. HIGHLIGHTSFor improving public open space (POS) accessibility, GIS-based measurements of physical and social data can determine priority areas in the cityPOS accessibility measurements in mainstream research use certain data and spatial units unavailable in data-limited countriesIn data-limited countries, the grid-based density analysis can provide more accuracy about priority areas for POS planningTaking the city with sub-regions of different POS accessibility helps with determining priority areasIzmir's central city and neighbourhoods with high child ratios and low education levels have the weakest POS accessibility