City HEAT- Bristol City Council

Surface heat temperature data

Bristol City Council was the first local authority in the UK to declare a climate emergency. It was awarded the European Green Capital in 2015 for its high environmental standards and commitment to further improvement and sustainability. 

The Council approached 4EI to see if satellite data could reveal heat patterns across Bristol.


We worked closely with sustainability representatives at the Council to deliver a cost-effective solution to identify areas from space where urban heat islands could present a hazard.


The resulting data on surface temperature will be combined with other GIS layers to provide insights into heat vulnerability and the location of hotspots. This will help the Council identify where interventions are needed through spatial planning, the built environment, public health or emergency planning to reduce heat-health risks.

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A map of Surface temperature 

The Urban Heat Map was achieved through our use of cutting-edge machine learning to create automated algorithms and workflows, alongside satellite-derived (Earth Observation) imagery.


This data allowed 4EI to measure land surface temperature and map infrastructure. This led to the identification of both seasonal and consistent hotspots to determine areas of high risk. 


The Council will be able to feed this data into systems to help plan, resource and mitigate for the adverse effect heat may have on the city. It can also influence future policymaking and funding. 

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An understanding of heat impact 

  • The delivery of consistent data shaped to meet user needs and answer specific planning and policy questions - especially around strategic planning, community resilience, neighbourhood planning, asset management, protection of vulnerable people and retrofitting programmes;


  • The data has opened-up conversations across multiple agencies;  


  • The data is a valuable engagement tool, translating complex hazards into digestible and accessible information for the non expert user.