Mevlüt Güllü

Geographical information systems aided traffic accident analysis system case study: city of Afyonkarahisar.

Geographical Information System (GIS) technology has been a popular tool for visualization of accident data and analysis of hot spots in highways. Many traffic agencies have been using GIS for accident analysis. Accident analysis studies aim at the identification of high rate accident locations and safety deficient areas on the highways. So, traffic officials can implement precautionary measures and provisions for traffic safety. Since accident reports are prepared in textual format in Turkey, this situation makes it difficult to analyze accident results. In our study, we developed a system transforming these textual data to tabular form and then this tabular data were georeferenced onto the highways. Then, the hot spots in the highways in Afyonkarahisar administrative border were explored and determined with two different methods of Kernel Density analysis and repeatability analysis. Subsequently, accident conditions at these hot spots were examined. We realized that the hot spots determined with two methods reflect really problematic places such as cross roads, junction points etc. Many of previous studies introduced GIS only as a visualization tool for accident locations. The importance of this study was to use GIS as a management system for accident analysis and determination of hot spots in Turkey with statistical analysis methods.

Monitoring of Deformations Along Fethiye-Burdur Fault Zone (Turkey) with GPS

Afyonkarahisar, Burdur and Fethiye region, southwest of Turkey is located on a tectonically active area. According to the historical recordings, the region was destructed by earthquakes many times. Since the beginning of the 20th century, more than 35 earthquakes with magnitudes bigger than 4 occurred in Afyonkarahisar region. Seven earthquakes recorded over the last 90 years in the region between Burdur and Fethiye whose magnitudes are between 5.0 and 7.0. This new project “Monitoring of Deformations Along Fethiye-Burdur Fault Zone With GPS”, is founded by The Scientific and Technical Research Council of Turkey (TUBITAK), Istanbul Technical University (ITU), Karadeniz Technical University (KTU) and Afyon Kocatepe University (AKU). The aim of the project is to determine strain accumulation of the study area.

Geo-historical Review of the Mediterranean Rivers from Kitab-ı Bahriye (Book of Navigation)

Rivers have played a vital role in the development of human societies on every inhabited continent, but for the purposes of this discussion the focus shall be on the Mediterranean region. Recent environmental changes in the Mediterranean region urge the scientific community to re-examine the relationship between the environment and the humans. In spite of their vital importance, there is no comprehensive study of the natural characteristics and diversity of the Mediterranean basin rivers.

Soft Computing Model in Geodetic Coordinate Tranformation

Anahtar kelimeler Koordinat dönüşümü; Yapay sinir ağları; Geri yayılımlı yapay sinir ağı; Benzerlik. Özet Türkiye’de jeodezik değerler 2001 yılına kadar ED50 datumunda üretilmiştir. 1990 yılından itibaren uydu tekniklerinin kullanımının artması ile koordinatlar WGS84 sisteminde elde edilmeye başlanmıştır. Doğal olarak bu datumlar arasında dönüşüm yapmak gerekli gelmiştir. Bu çalışmanın amacı Yapay Sinir Ağlarının (YSA) koordinat dönüşümünde kullanılmasıdır. Afyonkarahisar ve çevre illerinde seçilen noktalardan oluşan test ağında Benzerlik dönüşümü ve Geri Yayılımlı Yapay Sinir Ağı (GYYSA) yöntemleri karşılaştırılmıştır. GYYSA ve benzerlik yöntemleriyle hesaplanan koordinatlar ile bilinen koordinatlar arasındaki farklar karesel ortalama hata yönünden değerlendirilmiş ve GYYSA yöntemiyle daha iyi sonuçlar elde edilmiştir.