DBPapers
DOI: 10.5593/SGEM2014/B23/S10.045

URBAN HEAT ISLAND DETECTION BY INTEGRATING SATELLITE IMAGE DATA AND GIS TECHNIQUES. CASE STUDY: CLUJ-NAPOCA CITY, ROMANIA

A. Imbroane, A. E. Croitoru,I. Rus, I. Herbel, D. Petrea
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-12-4 / ISSN 1314-2704, June 19-25, 2014, Book 2, Vol. 3, 359-366 pp

ABSTRACT
Continuously increasing urbanization of big cities worldwide is nowadays an important issue in urban development studies. One of the most significant consequences is the intensification of urban heat islands over the big cities. This study aims to detect the different surfaces temperature in Cluj-Napoca city, Romania, by using satellite data images and GIS specific methods. The paper is based on satellite images of Landsat 5 and Landsat 7 missions and provided by USGS (United States Geological Survey) database. The images that passed the cloud cover controlled are taken in the summer months (June, July, and August). To evaluate the surface temperatures, we combined the satellite data images processing with GIS techniques. They have been integrated in a surface temperature estimation model where the spectral radiance is converted into temperature values. Then the surfaces with temperature higher than 30ºC have been identified and their total area has been calculated. Erdas Imagine 2013 și ArcMap 9.3 software have been used in processing the raster images. For a detailed investigation, temperature on two profiles over the city area was analyzed. The main findings of the paper are: there are important temperatures difference for various type of surfaces; the green areas and water bodies have the coldest surface temperature, which is usually 8 - 10 ºC lower compared to the hottest surfaces specific to built civil and industrial areas.

Keywords: urban heat island detection, Satellite images, Cluj-Napoca, Romania