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 9
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UID:pretalx-foss4g-europe-2025-VS7EX9@talks.staging.osgeo.org
DTSTART;TZID=CET:20250718T122000
DTEND;TZID=CET:20250718T122500
DESCRIPTION:Urban Heat Islands (UHI) represent an increasing challenge in c
 ities worldwide\, including smaller urban centres such as Varaždin\, Croa
 tia. This study analyses UHI dynamics over a Varaždin city during a ten-y
 ear period (2014–2024) using exclusively Free and Open-Source Software (
 FOSS) and publicly available Earth Observation (EO) data. Landsat 8 therma
 l imagery was used to calculate Land Surface Temperature (LST)\, and to an
 alyse its relationship with vegetation cover through the Normalized Differ
 ence Vegetation Index (NDVI) and the Proportion of Vegetation (PV). Urban 
 expansion was examined using the Normalized Difference Built-up Index (NDB
 I). All indices were derived from multispectral and thermal bands using QG
 IS 3.24 and Python 3.12 libraries including GDAL\, rasterio\, NumPy\, and 
 Matplotlib. The results show a measurable increase in surface temperature\
 , with the average LST rising by +4.41 °C\, accompanied by a loss of 3\
 ,230 pixels in the dense vegetation class (NDVI > 0.4). Simultaneously\, N
 DBI values indicate expansion of built-up areas across the southern and ea
 stern parts of the city. These changes confirm the spatial transformation 
 towards the urbanization and reduced vegetation cover as main cause of loc
 al thermal intensification. This study gives a standardized\, open-sourced
 \, transparent and reproducible analysis applicable to other medium-sized 
 cities. The study also explores the potential integration of additional EO
  sources (Sentinel-3\, MODIS\, VIIRS) and supporting geospatial data (Open
 StreetMap) for enhanced spatiotemporal resolution. The findings highlight 
 the value of FOSS tools and open data in supporting evidence-based urban c
 limate planning and advocate for scalable\, cost-effective approaches to U
 HI mitigation through green infrastructure and adaptive design.
DTSTAMP:20260527T222702Z
LOCATION:PA01 (Quarticle)
SUMMARY:Tracking Urban Heat Island Dynamics Using Open Source Tools and Fre
 e Data - Sanja Šamanović
URL:https://talks.staging.osgeo.org/foss4g-europe-2025/talk/VS7EX9/
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