The temperature of the land surface is one of the most key parameters that can provide valuable information about the physical characteristics of the earth's surface and the surrounding air. This research was conducted with the aim of investigating and evaluating the land surface temperature and analyzing it in relation to land use by the separate window algorithm in Parsabad city with two Landsat 5 and 8 satellite images for August 24, 1990 and 2020. The results showed that in the years 1990 and 2020, generally the western and northwestern parts of the city have forest covers and relatively dense vegetation, while the southwestern parts are generally mountainous and barren. The vegetation index of 1990 and 2020 in the eastern parts of the studied area has an NDVI index higher than 0.3, which indicates medium to high density vegetation. The maximum vegetation index in the range reached 0.55 in August, which is generally related to garden and agricultural lands or dense forest areas in the north and northeast of the range. On the other hand, large parts of Parsabad city, especially in the south and southwest of this city, lack vegetation and are considered barren lands. Also, the results of the land surface temperature evaluation showed that the retrieved spatial average temperature of the earth surface on August 24, 1990, which was obtained at 11:30 local time using the separate window algorithm, was 31.8 degrees Celsius in Parsabad city. While this temperature on this day and at this time in 2020 was equal to 33 degrees Celsius.
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