Daniel Johnson is an associate professor of geography whose work focuses on remote sensing in relation to public health, climate change and heat waves.
There are numerous ways cities can use this data to help residents combat extreme heat., which use indicators of heat-health risk and past heat waves to highlight high-risk communities. Knowing which communities are likely to be at the highest risk allows them to guide outreach to the most vulnerable people both before and during periods of elevated temperatures.
An extreme heat vulnerability index highlights areas that are more likely to experience heat-related illnesses and deaths. Darker browns indicate elevated risk. This index uses Landsat data to measure differences in surface temperature throughout the city, with socioeconomic indicators painting a highly accurate picture of community-level extreme heat health risk.
As the climate continues to warm and affect urban health, the Landsat satellites' sensors are among our best tools for monitoring the thermal variations of the urban heat island. Such work also serves as one of the best examples of employing satellite-based measurements to monitor and implement response to public health threats.
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