Foray into Land Use/Land Cover Dynamics in Sibsagar District, Assam using RS and GIS Techniques
Narayan Chetry and Madine Hazarika
The present study used satellite data from Landsat ETM image for the years 1991 and 2016. These data were taken from the Global Land Cover Database maintained by United States Geological Survey (USGS). These data were radiometrically and geometrically corrected. For the year 1971, the groundwork of land use/land cover (LU/LC) map using Survey of India (SOI) topographic map. Using visual interpretation technique LU/LC maps of 1991 and 2016 were prepared with the help of vector polygons for various units and then these data were converted in to raster grids format for the purpose of further analysis. The most predominant land use found is agricultural land with an aerial extent of 56.54% of the total area followed by settlement covering about 20.22 %. The LU/LC categories of water bodies, agriculture, swamps and marshes, settlements, built-up, grass lands, fallow lands and forests were considered for each year. The dynamics in it were analyzed. It is found that agriculture is the most dynamic land use category followed by settlement. Due to the growth of population in the district the requirement for agriculture land is very high. As a result of which there is growth of agricultural and settlements at the cost of marshes and swamps, forests and grasslands which are declined over the period of nearly four decades.
KEY WORDS: LU/LC Dynamics, GIS & RS, Sibsagar, Assam.