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Evaluating the scenario of urban blue-green space in Tezpur town of Assam using geo-technical approach

Hazarika Archita, Saikia Jyoti, Saikia Sailajananda

Acta Geophysica

2025

Vol. 73, no. 1

901--915

Urban blue-green space (UBGS) is considered to be an effective way to mitigate Urban Heat Island (UHI) effects. UBGS not only cools the actual space but also influences the surrounding areas; this phenomenon is termed as UBGS cooling effect. The present study tries to anatomize the UBGS of urban Tezpur with the help of geo-technology. Landsat satellite images of Thematic Mapper (TM) and Operational Land Imager (OLI) with 30 m spatial resolution were used to investigate the UBGS scenario for the years 1993 and 2023, respectively. Land Surface Temperature (LST), Normalized Difference Vegetation Index (NDVI), and Normalized Difference Water Index (NDWI) were taken into consideration for the ascertainment of UBGS and UHI. The correlation between LST and NDVI was also determined with the aid of simple regression analysis. The NDVI values for the years 1993 and 2023 are - 0.32 to 0.70 and - 0.44 to 0.50 respectively. The LST values of the town for the year 1993 are 28.76 to 20.17 and for 2023, the LST value is 29.47 to 20.36. The NDWI value indicates that the water index increased in the water bodies from the year 1993 to 2023. Though sufficient data are not available on the website, the data used in the study are free from major environmental and geometric disturbances to establish the LST, NDVI, and NDWI. However, the present work is the pioneer that used geo-spatial technology which will also help the urban planners and designers to deal with UBGS and UHI effects.

Thermal and ground deformation monitoring for early detection of volcanic eruptions: a case study of Taal volcano, Philippines

Michałowska Krystyna, Sobiech Edyta

Geomatics, Landmanagement and Landscape

2024

no. 4

157--169

Volcanic eruptions, such as those of Krakatau and Pinatubo, are uncontrollable natural phenomena with the potential for widespread destruction, including the global climate. Early detection of volcanic activity is crucial for mitigating risks and preventing loss of life. This study focuses on the Taal volcano, located in the Batangas region of the Philippines, which erupted in January 2020 after being dormant for 43 years. Using satellite remote sensing data, the study employed the Land Surface Temperature (LST) analysis, the Normalized Temperature Index (NTI), and ground deformation monitoring using radar-based the Small Baseline Subset (SBAS) InSAR techniques to detect early warning signs of volcanic unrest.

Erupcje wulkanów, takie jak Krakatau i Pinatubo, to niekontrolowane zjawiska naturalne, które mogą spowodować rozległe zniszczenia, w tym globalny klimat. Wczesne wykrycie aktywności wulkanicznej ma kluczowe znaczenie dla łagodzenia ryzyka i zapobiegania utracie życia. Niniejsze badanie koncentruje się na wulkanie Taal, znajdującym się w regionie Batangas na Filipinach, który wybuchł w styczniu 2020 r. po 43 latach uśpienia. Wykorzystując dane z teledetekcji satelitarnej, badanie wykorzystało analizę temperatury powierzchni ziemi (LST), znormalizowany wskaźnik temperatury (NTI) i monitorowanie deformacji gruntu za pomocą opartych na radarze technik InSAR Small Baseline Subset (SBAS) w celu wykrycia wczesnych oznak ostrzegawczych niepokojów wulkanicznych.