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Urban Heat Island
Indicator detail
19.2.1 Urban heat island
Metadata
| Relevance/rationale of the indicator (resp. why the indicator was chosen to measure the target and how it is suitable for these purposes) | Urbanization processes are significant anthropogenic interventions in the climate system and lead to the creation of different climatic conditions. Cities thus have a higher air temperature in comparison with their surroundings, temperature anomalies have an annual and daily course, minimum daily temperatures are most affected by the city. |
| Target value of the indicator and its evaluation | |
| Definition | Areas of urban areas of cities according to their susceptibility to overheating. According to the methodology of the indicator, the share of the area is related to the period 2014–2018*, the share of population was calculated from these specified areas with high susceptibility to overheating according to population data data per unit are only available from Census/Census. *Landsat 8 thermal data were used to determine the indicator values, which have sufficient spatial (100 m) and temporal resolution (8 to 16 days); Selected images were taken in 2014–2018, with each image corresponding to a different month of the year. Based on the average values and standard deviations of the surface temperature in the surrounding landscape, limits were set, according to which areas with relatively higher temperatures were found in individual urban areas in individual months. By harmonizing the set of all data, the areas that are most susceptible to overheating in all examined months, ie during the whole year, were detected, thus eliminating cases of occasionally increased surface temperatures at the time of taking one of the images. |
| Measuring unit | % of the city territory, % of the population |
| Indicator disaggregation | By selected cities |
| Reference period (resp. the period to which the indicator relates) | 3 years |
| Related geographical area | By selected cities |
| Comment | In urban agglomerations, additional warming (so-called urban heat islands) is observed, which is caused by higher presence of artificial impermeable surfaces with different radiation-thermal properties compared to the open landscape. The highest average annual temperature in 2020 was also due to these influences in the South Moravian Region (10,1 °C) and the Central Bohemian Region, including the Capital region (9,9 °C). |
| Update periodicity | Once every three years |
| Time coverage since | 2017 |
| Time coverage until | 2027 |
| Time series available at the data provider since | |
| Data publication date (resp. the date when the data provider publishes (regularly) data; it is given in the format T + the number of days, months or years when T is the end of the reference period) |
| Contact point - data provider - e-mail | Edita.Koblizkova@cenia.cz |
| Contact point - data provider - name | Edita Koblížková |
| Data source | Ministry of Environment |
| Data origin | Czech Environmental Information Agency |
| Links to detailed metadata or methodology | Hofrajtr, M., Seidlová, J., Doubrava, P., Kvapil, J., & Kochová, I. (2021). Metodika vymezení ploch náchylných k přehřívání z infračervených termálních dat Landsat. V recenzním řízení. Praha: CENIA. Hofrajtr, M., Seidlová, J., Bartlová, I., Kvapil, J., & Doubrava, P. (2020). Spatial-Temporal Changes of Land Surface Temperature in Dependence on Land Cover, Altitude and NDVI in Selected Areas of Czechia. Exploration Geophysics. Exploration Geophysics. Remote Sensing and Environment, (2), 33-46. doi:10.26345/EGRSE-033-20-203. |
| Links to international comparison | https://www.eea.europa.eu/data-and-maps/data/external/urban-heat-island-summer-intensity |