Monitoring and modelling spatio-temporal urban growth of Delhi using Cellular Automata and geoinformatics

摘要

The study encompasses spatio-temporal land use/ land cover (LULC) monitoring (1989-2014) and urban growth modelling (1994-2024) of Delhi, India to deduce the past and future urban growth paradigm and its influence on varied LULC classes integrating geospatial techniques and Cellular Automata (CA). The study focused on scrutinising the reliability of the CA algorithm to function independently for urban growth modelling, provided with strong model calibration. For this purpose, satellite data of six stages of time at equal intervals along with the population density, distance to CBD and roads, and terrain slope are used. The satellite-based LULC during 1989-2014 exhibited 457 km(2) of net urban growth (275% change), cloned by the simulated LULC with net increase 448 km(2) (270% change). The spatial variation analysis using the principal component analysis (PCA) technique exhibit high similarity in classification ranging from 72% to 88%. The statistical accuracy between the satellite-based and simulated built-up extent of 2014 resulted in the overall accuracy 95.62% of the confusion matrix, and the area under the receiver operating characteristic (ROC) curve as 0.928-indication high model accuracy. The projected LULC exhibit that the urban area will increase to 708 km(2) and 787 km(2), primarily in western and eastern parts during 2019 and 2014 respectively. The rapid urban growth will replace and transform others LULC (net loss 138 km(2)) followed by vegetation cover (net loss 26 km(2)) during 2014-24. This rapid urban growth is detrimental to the habitat and may trigger critical risks to urban geo-environment and ecosystem in Delhi. Therefore, the study necessitates towards decentralization of urban functions and restoration of varied LULC in order to regulate the future urban growth patterns for sustainable development. The GDAL and NumPy libraries in Python 3.4 were efficient in spatial modelling and statistical calculations.