نبذة مختصرة : The Klaten Regency’s fast population increase can affect land use, particularly on Green Open Space, which is becoming developed land. The presence of Green Open Space can provide benefits for the thermal comfort of the city and contribute to the mitigation of urban heat effects. This study aims to (1) Analyze the availability of Green Open Space in Klaten Regency, (2) Analyze the level of thermal comfort in Klaten Regency, and (3) Analyze the effect of Green Open Space on thermal comfort in Klaten Regency. The data used in this research is Landsat 8 OLI/TIRS image in 2023 used to obtain the availability of green open space using the Normalize Difference Vegetation Index (NDVI) method and obtain air temperature values using the Land Surface Temperature (LST) method. The method used to assess the comfort index is the Temperature Humidity Index (THI) by processing temperature and humidity values. The results showed that the availability of green open space in Klaten Regency has an area of 37542.1 ha. The comfort level that dominates in Klaten Regency is comfortable with an area of 34312.96 ha. Green Open Space in Klaten Regency has a 76.5% influence on the level of comfort.
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