Spatiotemporal Variability of Urban Greenspace and Surface Temperature in Dhaka City: A Public Health Aspect

Abstract Urban greenspaces can affect the physical and mental health of city residents they also contribute to improving urban environmental quality in ways that benefit human health. Dhaka, a megacity with over 22.4 million residents, has progressively lost its greenspace past decade as grown urbanised. This study evaluates availability accessibility considering population residential areas, well assessing changes last 30 years throughout city. We utilized secondary data from 2011 Census areal imagery perform analysis for wards, smallest administrative unit, using ArcGIS software. generated geospatial maps distribution vegetation, land surface temperature humidity different years. Accessibility was measured 100-meter 300-meter buffer zones, total 56.5 square kilometers area 77.47 fell under these territories. Changes vegetation were obtained Normalized Difference Vegetation Index (NDVI) 1990, 2000, 2010, 2020, high level loss observed. Land Surface Temperature (LST) Moisture (NDMI) used assess same Dhaka 2.24% coverage only 2 wards out 110 have greater than 20% coverage. A highest estimate 0.003207 meter per capita found at ward-46, which does not even meet minimum standard. Increased decreased observed 1990 may adversely impact on population’s public correlation between NDVI LST NDMI. In 49% decreased, whereas increased. provides noteworthy information lack The spatial provided potential be useful taking measures sustainable greenery management Dhaka’s growing population.