Analyzing the spatial variations of the thermal islands (case study: Urmia city)

Investigating the status of thermal radiation dispersion and its relation with different types of users, it is important to recognize the microclimate of different regions of cities. The development of urbanization and industrial activities in major cities has led to large changes in the physical location of the earth's surface, the released heat energy, temperature variations, and other weather parameters and the urban thermal island. Remote sensing using infrared thermal radiation and the application of physical models is a suitable tool for calculating the surface temperature in vast areas. In the present study, TIRS, OLI Landsat Satellite 8 was used to recognize the formation of the Upper Islands in the city of Urmia during the period 1392 to 1395. The results of processing satellite images show that the minimum and maximum temperatures in Urmia have been rising during 1392 to 1395, and this increase in temperatures in the urban areas is far more significant. Over the past four years, three major areas have been identified, with spatial changes in the thermal island core at or near them. These three areas are: north of the city, west of the city and central part of Urmia city, and also the 5th city of Urmia with the higher percentage of area in high temperature grade compared with other regions, the warmest region of Urmia was identified.