EFFECT OF URBAN GREEN AND BLUE SPACES ON LAND SURFACE TEMPERATURE - A GEOSPATIAL APPROACH

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Year:
2017
Type of Publication:
Article
Keywords:
LST, Spatial variability, LANDSAT-8, UHI, Green and blue spaces
Authors:
Alisha Chowdhury, Valliappan AL Venkata Sai Krishna Vanama
Abstract:
Urban areas are characterized by heterogeneous land uses. The city development pattern, socio-economic and anthropogenic activities results in the formation of urban heat island (UHI) which are characterized by high land surface temperatures (LST). Cities are experiencing a rapid increase in LST. Urban green spaces such as parks, play grounds, lawns and blue spaces such as ponds, lakes, rivers that are present in and around the city can help in regulating the land surface temperature. These spaces also lead to formation of urban cooling island (UCI) around them due to shading from the trees, evapotranspiration from the waterbodies, wherein the temperature is comparatively cooler than surrounding temperatures. This formation of a cooling island is known as the Park Cooling Island (PCI) effect. The present research aims at identifying the effect of urban green and blue spaces on LST through a multitude of data sources and geospatial technologies. Pune city is chosen as a study area for the research. The data used in the research includes secondary data from various government and semi government organizations, Landsat 8 temporal satellite images and field data. LST was calculated from Landsat 8 thermal bands by using emissivity reference channel algorithm. Various indices such as normalized difference vegetation index (NDVI), normalized difference built-up index (NDBI), normalized difference water index (NDWI), land shape index (LSI), size and perimeter-area ratio (PAR) were calculated from Landsat 8 images. A bivariate regression analysis was performed by taking LST response variable and other indices as exploratory variables. The results show that there is a high spatial variability in LST as well as urban green, blue spaces have a stronger influence on the LST.
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