Urban heat islands are a measurable and well-documented consequence of high-density development. Impervious surfaces, reduced vegetation cover, waste heat from buildings and vehicles, and the replacement of natural ground cover with concrete and asphalt raise ambient temperatures in urban areas by 2 to 5 degrees C above surrounding rural areas. In Indian cities, where summer temperatures already approach or exceed safe thresholds for outdoor activity, this increment has direct implications for public health, building cooling loads and occupant comfort.

Addressing urban heat requires first understanding where it concentrates, how it moves across the day and which interventions produce measurable reductions. This requires spatial temperature data at a resolution that regional weather networks cannot provide.