ARTICLE
TITLE

Seasonal variation of surface temperature based on land cover in AnkaraAnkara sehrinde yüzey sicakliklarinin arazi örtüsüne göre mevsimsel degisimi

SUMMARY

In this study, the seasonal variation of the surface temperature of Ankara urban area and its enviroment have been analyzed by using Landsat 7 image. The Landsat 7 images of each month from 2007 to 2011 have been used to analyze the annually changes of the surface temperature. The land cover of the research area was defined with supervised classification method on the basis of the satellite image belonging to 2008 July. After determining the surface temperatures from 6-1 bands of satellite images, the monthly mean surface temperatures were calculated for land cover classification for the period between 2007 and 2011. Accordsng to the results obtained, the surface temperatures are high in summer and low in winter from the air temperatures. all satellite images were taken at 10:00 am, it is found that urban areas are cooler than rural areas at 10:00 am. Regarding the land cover classification, the water surfaces are the coolest surfaces during the whole year. The warmest areas are the grasslands and dry farming areas. While the parks are warmer than the urban areas during the winter, during the summer they are cooler than artificial land covers. The urban areas with higher building density are the cooler surfaces after water bodies. ÖzetBu çalismada, Ankara sehri ve çevresindeki yüzey sicakliklarinin yil içerisindeki degisimi incelenmistir. 2007-2011 yillari arasinda yilin tüm aylarina bir görüntü düsecek sekilde, Landsat 7 uydusu ile alinan görüntülerin kullanildigi çalismada, 2008 yili temmuz ayi görüntüsünden kontrollü siniflandirma yöntemiyle sehir ve çevresine ait arazi örtüsü olusturulmustur. Uydu görüntülerinin 6-1 termal bantindan  yüzey sicakliklari hesap edildikten sonra, arazi örtülerinin her aya ait ortalama yüzey sicakliklari belirlenmistir. Elde edilen degerlere göre yüzey sicakliklari, hava sicakligina paralel olarak, yaz aylarinda yüksek, kis aylarinda düsüktür. Tüm uydu görüntüleri saat 10:00 (GMT+2)’da alindigi için sehir, kirsal alanlara göre düsük sicaklikta çikmistir. Arazi örtüsüne göre su yüzeyleri tüm yil boyunca en soguk yüzeylerdir. En sicak yüzeyler ise mera alanlari ile kuru tarim alanlaridir. Sehir içerisindeki yesil alanlar kis aylarinda sehirden daha sicakken, yaz aylarinda sehirden daha soguktur. Sehir alani genel olarak, su yüzeylerinden sonra en soguk yüzeylerden olusmaktadir.

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