Urban development 

  Urban heat

 

 

     Around half of the world’s human population lives in urban areas. In the near future it is expected that the global rate of urbanization will increase by 70% of the present world urban population by 2030, as urban agglomerations emerge and population migration from rural to urban/suburban areas continues. Thereby, it is not surprising that the negative impacts related to urbanization is an increasing concern capturing the attention of people worldwide.( Camilo Pérez Arrau, Marco A. Peña)

 

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http://www.urbanheatislands.com/home

 

  Case study  of urban heat

 

 3D Heat Signature

     Using a specially outfitted Lear Jet, NASA researchers collected thermal data about the Atlanta metro area. As shown here, that aircraft data is lined up with a larger image, taken from the orbiting Landsat 5 satellite. The image starts in "natural" color and immediately transitions to a daytime temperature reading, with white and red indicating highest temperatures, respectively, and blues indicating cooler temperatures. Notice how the buildings themselves help keep small areas cool, casting shadows across the pavement and walls of surrounding structures. As the city rotates, the data fades to a nighttime reading. Using the same color scale, you can see how much heat remains locked in the developed areas of the city, a phenomena which becomes instantly apparent as the picture zooms out again to show the long stripe of data draped across the terrain.