150
8.3.3 Siliguri Municipal Corporation (SMC)
Siliguri city is situated at the foothill of the Himalayan mountain range in the plain.
Different hill towns (Gangtok, Rangpo, Kalimpong, Kurseong, Mirik and Darjeeling)
are connected with this city and also with the rest part of the India. Like Kolkata, the
metropolitan city, Siliguri also has a long development history, and as the main
entrance point of the states as well as the north-eastern states, different industrial
regions as well as unplanned building are also constructed in the city. After the independence of India (1947), the growth of population has increased rapidly due to refugees coming from East Pakistan, later named Bangladesh (Chandna 1986). In 1960’s
anti-Bengali riot, again a lot of refugees have come here from the state of Assam.
From the image analysis and different indices, it is clear that built-up area has been
predominating, mostly in unplanned manner. The change of the BU is mainly detected
in the north, northeastern, southern and some isolated western part from 2006 to 2018.
8.3.4 Durgapur Municipal Corporation (DMC)
Durgapur Municipal Corporation (DMC) is the industrial city as well as planned city of
West Bengal. Rivers Damodar and Ajay are the chief rivers here. History of the industrialisation and urbanisation of Durgapur has been developed because of these three
organisations: the Tiles Factory of Burn Company (1905), Damodar Valley Corporation
and Durgapur Steel Plant, although the growth of the city is predominating in the central part of the city during 2006 to 2018 extremely. Different BU areas located in the
southern, western parts of the city, the growth of the BU has been increased very much
and the NDVI value also decreases drastically over the time periods.
8.4 Material and Methods
Multi-temporal satellite images of major cities of West Bengal have been downloaded from the USGS website. Here three recent times’ (2006, 2011 and 2018)
satellite images have been used to quantify the recent growth of the concerned cities
of West Bengal. All the satellite images used here are cloud-free and noise-hazefree; because during the correction of satellite images original pixel value may be
destroyed, cloud-free data have been used here. The Landsat ETM+/TM imagery
with Band 2, Band 3, Band 4, Band 5, Band 6 and Band 7 and Landsat OLI or 8
satellite imagery with Band 3, Band 4, Band 5, Band 6, Band 7, Band 10 and 11
have been used to demarcate the growth of built-up area of the city. The details of
spectral information and mathematical equations have given in Tables 8.1, 8.2, 8.3,
8.4, 8.5 and 8.6. After collection of the data, different corrections like atmospheric
correction and radiometric correction are also done. Thereafter, stacking of each
satellite data and clipping from shapefiles (.shp) from four major urban centres of
R. K. Paul and P. Patra
8.3.3 Siliguri Municipal Corporation (SMC)
Siliguri city is situated at the foothill of the Himalayan mountain range in the plain.
Different hill towns (Gangtok, Rangpo, Kalimpong, Kurseong, Mirik and Darjeeling)
are connected with this city and also with the rest part of the India. Like Kolkata, the
metropolitan city, Siliguri also has a long development history, and as the main
entrance point of the states as well as the north-eastern states, different industrial
regions as well as unplanned building are also constructed in the city. After the independence of India (1947), the growth of population has increased rapidly due to refugees coming from East Pakistan, later named Bangladesh (Chandna 1986). In 1960’s
anti-Bengali riot, again a lot of refugees have come here from the state of Assam.
From the image analysis and different indices, it is clear that built-up area has been
predominating, mostly in unplanned manner. The change of the BU is mainly detected
in the north, northeastern, southern and some isolated western part from 2006 to 2018.
8.3.4 Durgapur Municipal Corporation (DMC)
Durgapur Municipal Corporation (DMC) is the industrial city as well as planned city of
West Bengal. Rivers Damodar and Ajay are the chief rivers here. History of the industrialisation and urbanisation of Durgapur has been developed because of these three
organisations: the Tiles Factory of Burn Company (1905), Damodar Valley Corporation
and Durgapur Steel Plant, although the growth of the city is predominating in the central part of the city during 2006 to 2018 extremely. Different BU areas located in the
southern, western parts of the city, the growth of the BU has been increased very much
and the NDVI value also decreases drastically over the time periods.
8.4 Material and Methods
Multi-temporal satellite images of major cities of West Bengal have been downloaded from the USGS website. Here three recent times’ (2006, 2011 and 2018)
satellite images have been used to quantify the recent growth of the concerned cities
of West Bengal. All the satellite images used here are cloud-free and noise-hazefree; because during the correction of satellite images original pixel value may be
destroyed, cloud-free data have been used here. The Landsat ETM+/TM imagery
with Band 2, Band 3, Band 4, Band 5, Band 6 and Band 7 and Landsat OLI or 8
satellite imagery with Band 3, Band 4, Band 5, Band 6, Band 7, Band 10 and 11
have been used to demarcate the growth of built-up area of the city. The details of
spectral information and mathematical equations have given in Tables 8.1, 8.2, 8.3,
8.4, 8.5 and 8.6. After collection of the data, different corrections like atmospheric
correction and radiometric correction are also done. Thereafter, stacking of each
satellite data and clipping from shapefiles (.shp) from four major urban centres of
R. K. Paul and P. Patra