Spatial Aspects of a Secondary City: Change Detection and Index-based Built-up Assessment for Jorhat

By : Namita Sharma , Syeda Rijwana Yasmin

Page No: 33-53

Abstract
Land use planning has emerged as a cornerstone of modernism and the application of geospatial technologies has laid the groundwork for the rejuvenation of the decisionmaking process. The present research aims to evaluate the changes in the spatial patterns of landscape mosaics, with a primary focus on the built-up environs in Jorhat, an upcoming secondary city of Assam. The study also highlights one of the most conspicuous challenges of secondary cities, i.e., the proliferation of slums. LANDSAT 7 (2002) and 9 (2022) satellite data were used for Land Use Land Cover (LULC) and change detection which was obtained from the United States Geological Survey (USGS) earth explorer. The Index-based Builtup Index (IBI) has been used for urban extraction. The accuracy assessment results of LULC classes were discovered to be extremely good for both years (i.e. Kappa coefficient >80%). Over the past two decades, paddy cultivation has registered a decline from 701.12 sq. km. in 2002 to 438 sq. km. in 2022. On the other hand, the built-up area has registered an increase from 77.84 sq. km. in 2002 to 168.29 sq. km. in 2022. Moreover, this study has shown that the IBI has a strong negative correlation with water and vegetation. The slum pockets were identified and growth was traced. Such findings on the built-up area holds tremendous implications for the future of urban planning exercises.

Authors :
Namita Sharma : Research Scholar (Ph.D), Department of Geography, Gauhati University, Assam, India.
Syeda Rijwana Yasmin : Department of Geography, Gauhati University, Assam, India.
 

DOI: https://doi.org/10.32381/NL.2023.55.03.3