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Monitoring the spatial form of thermal islands in Shiraz using multispectral images
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Maryam Khosravian *   1, Yaaghob Zanganeh1 , Mokhtar Karami1 , Rahman Zandi1 |
| 1- hakim sabzavari uni |
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Abstract: (195 Views) |
| Earth surface temperature is one of the important criteria in regional regional planning. Today, the increase in temperature of some densely populated urban areas compared to the surrounding rural areas has created a phenomenon known as the urban heat island and has caused many problems. Urban heat island is a surface of the city that is significantly warmer than the surrounding rural areas. For this purpose, first, 8 satellite images of the warm period of the city of Shiraz, during the period from 1985 to 2020, using the data of sensors (TM) Landsat 4 and 5, (ETM+) Landsat 7, (OLI) /TIRS) was collected and extracted by Landsat 8. After the necessary pre-processing, normalized difference vegetation indices (NDVI), land surface temperature (LST) and city thermal area dispersion index with ecological assessment (UTFVI) were calculated. Based on the results of image processing, the places with heat islands, how the temperature changes in the city, the relationship between the changes in the surface temperature and the surface cover were investigated and analyzed in order to identify and analyze the urban heat islands of Shiraz. Changes in the time scale of temperature patterns in Shiraz showed that from 1985 to 2020, about 12.76 square kilometers have been added to the area of the fourth temperature floor. The results of calculating the NDVI index during the studied time period, the vegetation area has decreased from 22.28 square kilometers in 1985 to 17.54 square kilometers in 2020 due to the change of urban uses, which can be the reason for the shape Catching and increasing heat islands in the mentioned areas. The UTFVI index showed that it is very very bad (very hot temperature class) mainly in the western parts of Shiraz from the northwest to the southwest (including parts of region 9 and 10), the southeastern regions of region 7 and the northern regions. Zone 1 is concentrated. |
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| Keywords: Satellite images, urban heat islands, indices, LST, NDVI and UTFVI, Shiraz |
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Full-Text [PDF 1461 kb]
(68 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2022/07/12 | Accepted: 2022/09/11 | Published: 2024/10/21
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