Using high spatial resolution airborne thermal-IR data to map the urban thermal environment

Urbanization is one of the greatest examples of human modification of the natural environment. An environmental consequence of urbanization is the urban heat island effect, which results from the replacement of natural landscapes with impervious surfaces such as concrete and asphalt. The heat retention from impervious surfaces causes a disruption of the surface energy balance, and can exacerbate existing air pollution conditions. In order to fully understand the urban microclimate, it is appropriate to examine the thermal pattern of the urban environment. This study analyzes the urban thermal pattern of Salt Lake City using airborne, 10-m spatial resolution ATLAS (Advanced Thermal Land Applications Sensor) data. A classification technique using visible, near-IR, mid-IR, and thermal-IR data produces thermal properties of individual land covers. Such land covers include a mix of vegetation types, impervious surfaces, and soils. Their respective thermal properties are examined in relation to the total urban thermal pattern of downtown Salt Lake City. Results from the study may then be used as a tool for urban planners in implementing heat island reduction strategies.