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  • Urban heat islands affect human

  • health and it affects energy consumption. Those two things alone are

  • enough to drive worldwide interest. (Zhang) When we

  • build an urban area, we're replacing the vegetated surface and also

  • the soil surface with this imperious surface like the

  • paving material and the building material. By doing this, we're basically

  • warming the urban areas, and this will generate a temperature difference.

  • And that's what we can the urban heat island. We find out

  • that the urban heat island affected by several factors.

  • The first factor will be the surrounding ecological context.

  • And then will be the size of the city. When talking about size, we can

  • we mean both the area of the city and also the population size

  • of the city. And then will be the shape of the city

  • and also the development patterns of the city.

  • (Imhoff) We used a variety of satellite data, both land surface data

  • from MODIS and also impervious surface data from the

  • Landsat satellite. Inpervious surface data essentially tells us

  • how much building material is on the land surface in order to study the urban

  • heat island. The urban heat island is much larger if you

  • convert a forested area into an urban. And this is because the urban

  • heat island is a relative measure. So, urban areas in forests

  • are much warmer than the surrounding landscape than they are in deserts

  • for example, because the surrounding landscape is already warm.

  • I think the general public should be interested in urban heat islands because of the

  • fact that it's where most of the people live and in the next

  • 50 years, we're going to see 80% of the global population living in

  • cities. And the urban heat island matters for

  • everything from health, like asthma and heart conditions,

  • to how much heating and air conditioning you need to use to

  • cool or heat your living space.

  • (beeping)

Urban heat islands affect human

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B1 INT US urban heat island surface city surrounding

NASA | Urban Heat Islands

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    羅紹桀   posted on 2015/11/05
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