Urban heat island map

Urban heat island map reveals extreme thermal differences between central and peripheral areas, using satellite and sensor data.

About this subject

Urban heat islands are climatic phenomena where metropolitan areas experience significantly higher temperatures than adjacent rural zones. This effect is mainly caused by replacing natural surfaces with concrete, asphalt, and other heat-absorbing materials, along with reduced vegetation and heat from vehicles and air conditioning systems. Studies show that in large centers like São Paulo, the difference can reach 7°C on summer days, worsening public health issues such as heatstroke and respiratory diseases.

Maps like this are generated from thermal infrared satellite data and ground weather stations. They identify hotspots, areas with high building density, few green spaces, and heavy traffic, where temperatures are highest. Cities such as Rio de Janeiro and Brasília also experience intense heat islands, directly impacting electricity consumption (increased air conditioning use) and residents' quality of life.

Mitigation strategies include creating parks and green roofs, permeable pavements, and increasing albedo with reflective coatings. In 2023, São Paulo installed over 200,000 square meters of green roofs on schools and hospitals, reducing local temperatures by up to 3°C. Understanding heat island patterns, facilitated by detailed maps, is essential for urban planning and climate adaptation.

Frequently Asked Questions

What is an urban heat island?

It is a phenomenon where urban areas are warmer than surrounding rural zones, due to heat absorption by artificial surfaces and lack of vegetation. The difference can reach 7°C.

How are heat island maps created?

They are made using satellite thermal infrared data and ground weather stations. Information is processed to generate temperature gradients.

What solutions help reduce heat islands?

Green roofs, permeable pavements, trees, and reflective coatings can lower local temperature. São Paulo has already installed over 200,000 m² of green roofs.