TITLE:
A Novel Approach in Identification of Urban Hot Spot Using Geospatial Technology: A Case Study in Kamrup Metro District of Assam
AUTHORS:
Jonali Goswami, Shreya Roy, S. Sudhakar
KEYWORDS:
Hot Spot; LST; G Statistics; Impervious Area; Geospatial; RS GIS
JOURNAL NAME:
International Journal of Geosciences,
Vol.4 No.5,
July
17,
2013
ABSTRACT: Urbanization in recent years plays an important role in increase in impervious areas with reducing in vegetation cover and pervious areas of natural landscape. This
leads to a rise in temperature of urban areas, by several degrees particularly
at night [1,2]. A novel geospatial approach has been adopted to determine the
maximum temperature areas (hot spots) over Kamrup Metro District of Assam,
which is a gateway for seven neighboring north eastern states of India. The G
statistics have been calculated for detecting the presence of hot spot or cold
spot over the entire study area which is a new approach in urban heat island
studies. The resultant z-scores and p-values show the pixels with
either high or low values cluster spatially. For statistically significant
positive z-scores, the larger the z-score is, the more intense the clustering
of high values (hot spot) and vice versa. Land Surface Temperature (LST)
anomaly values and percentage of Impervious Surface Area (ISA) along with
climatic data are used to conform the hot spot location. It is one of the
densely populated areas with more commercial pockets thereby giving rise to
anthropogenic heat discharge which accelerates the heat island phenomenon.
Incorporation of socio-economic survey data as well as certain biophysical parameters
can be used to know about the cause and future impact of urbanization.