Spatiotemporal shifts in thermal climate in responses to urban cover changes: a-case analysis of major cities in Punjab, Pakistan
| Autor: | Adil Dilawar, Baozhang Chen, Yongyut Trisurat, Venus Tuankrua, Arfan Arshad, Yawar Hussain, Simon Measho, Lifeng Guo, Alphonse Kayiranga, Huifang Zhang, Fei Wang, Shaobo Sun |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Geomatics, Natural Hazards & Risk, Vol 12, Iss 1, Pp 763-793 (2021) |
| Druh dokumentu: | article |
| ISSN: | 1947-5705 1947-5713 19475705 |
| DOI: | 10.1080/19475705.2021.1890235 |
| Popis: | This study investigates the relationship of urban thermal environment (UTE) with various influential factors as well as ecological conditions. The relation between LST and land use and land cover (LULC) changes was explored in terms of remote-sensing (RS) based indices; heat effect contribution index (HECI), Urban thermal field variance index (UTFVI), Surface urban heat island intensity (SUHII), Normal Difference Built-up Index (NDBI), and Normal Difference Vegetation Index (NDVI). LULC maps were classified using the unsupervised classification technique and made error matrix to determine the accuracy. Results revealed that the vegetated area in Faisalabad decreased by 230 km2 due to an expansion in the urban area of 124-320 km2 during the period 1992-2014. An average LST in the rural buffers is increasing rapidly as compare to urban buffer and varied over the eight years with a range of 0.68-2.57 (°C). After 2007, SUHII's linear trend was negative because rural temperatures were still rising. Based on HECI, we found that urban expansion mainly led to increase in LST. UTFVI has shown poor ecological conditions in all urban buffers. In addition, there is a positive correlation between LST and NDBI, while NDVI indicates a negative correlation with LST. |
| Databáze: | Directory of Open Access Journals |
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