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This study analyzes land use and vegetation changes in Dhaka District, Bangladesh, using remote sensing and machine learning techniques from 2019 to 2024. By employing high-resolution satellite imagery and various classifiers, the research reveals a 59.5% increase in urban built-up areas alongside significant declines in vegetation and water bodies, indicating a troubling trend of land conversion driven by rapid urbanization. The findings emphasize the critical role of advanced monitoring tools in informing sustainable urban planning and environmental conservation efforts.
Urban expansion in Dhaka has surged by nearly 60%, with alarming declines in vegetation and water bodies, highlighting the urgent need for sustainable urban planning.
Rapid urbanization in Dhaka District, Bangladesh has triggered substantial alterations in land use and environmental conditions, necessitating systematic monitoring for informed urban planning and ecological sustainability. This study employs remote sensing data and machine learning techniques to analyze spatiotemporal changes in land cover and vegetation dynamics between 2019 and 2024. High-resolution satellite imagery from Sentinel-2 MSI and Landsat 8 was utilized to classify land cover types and compute spectral indices including the Normalized Difference Vegetation Index (NDVI), Normalized Difference Built-up Index (NDBI), and Normalized Difference Water Index (NDWI). A supervised machine learning approach incorporating Decision Tree, K-Nearest Neighbors (KNN), and Random Forest classifiers was applied using labeled geospatial training points within Google Earth Engine. Accuracy assessments were conducted using confusion matrices and kappa statistics. Results indicate a 59.5% increase in urban built-up areas and a significant decline in vegetation (-8.46%) and water bodies (-7.77%) over the five-year period. Land conversion from vegetated and aquatic areas to urban infrastructure was identified as a dominant trend. Among the models, Random Forest demonstrated the highest classification accuracy. These findings underscore the growing environmental pressures driven by unregulated urban expansion in Dhaka. The study highlights the potential of remote sensing and machine learning tools in providing timely, actionable data to support sustainable urban development, land-use regulation, and ecosystem conservation policies.
