29.01.2026

Thermal function maps for interdisciplinary planning teams

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Building Design
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LEGO bricks in red and yellow - Photo by Muyuan Ma

If you want to understand how cities really function today – and want to survive tomorrow – you have to make their invisible climate flows visible. Thermal function maps transform temperature data into a planning basis that not only electrifies experts. They are both a compass and a warning system, a tool for visionaries and a lifeline for neighborhoods groaning under the urban heat. But what is behind these maps? And why should interdisciplinary teams definitely not do without them?

  • An explanation of what thermal function maps are and why they are becoming indispensable for urban and landscape planning.
  • How thermal function maps are created, which data sources and technical methods are used.
  • The role of thermal function maps for climate-resilient urban development and heat action plans.
  • Why interdisciplinary planning teams rely on these maps and how they are revolutionizing collaboration between urban planners, landscape architects, engineers and administrators.
  • Best-practice examples from Germany, Austria and Switzerland that impressively demonstrate the added value of these maps.
  • Legal, technical and organizational challenges of integration into municipal planning processes.
  • Innovative applications: From urban land-use planning to citizen participation – how maps become a dialog instrument.
  • Risks and limitations: Data uncertainties, data protection and the risk of technocratic overcontrol.
  • Strategies on how local authorities and planning offices can exploit the full potential of thermal function maps.
  • Concluding evaluation and outlook: Why the future of urban planning is unthinkable without precise climate maps.

Thermal function maps: making the invisible climate visible

Public perception is still dominated by colorful temperature maps from weather apps when it comes to heat in the city. But professional thermal function maps are far more than just pretty color fields. They are the result of years of research, data-driven analysis and a new sensitivity to the challenges of urban climate change. At their core, they are detailed, geo-referenced representations of temperature distribution, air currents and heat pollution in cities and neighborhoods. Such maps show not only where it is hot, but why – and what can be done about it.

Thermal function maps are based on a variety of data sources. Satellite images, drone flights, stationary and mobile measuring sensors and numerical flow models provide the raw data. These are processed using geographic information systems (GIS) and blended with other factors such as the degree of sealing, vegetation index, building structures and traffic volume. The result is high-resolution maps that depict not only surface temperatures, but also microclimates and their changes over the course of the day and year.

In contrast to classic urban climate maps, which are usually based on long-term average values, thermal function maps provide dynamic, sometimes even daily updated information. They are increasingly fed with real-time data: Weather stations on roofs, mobile measurements in street spaces or new IoT sensor technology are creating an unprecedented density of climate information. This data can be coupled with urban planning simulations to predict the impact of new buildings, fresh air corridors or green spaces on the local microclimate, for example.

The creation of such maps is a science in itself. It requires not only technical expertise, but also a deep understanding of the interactions between urban structure, materiality, vegetation and atmosphere. The trick is to process the complexity of the data in such a way that planning teams can derive tangible measures from it. This is where the true value of the thermal function map becomes apparent: it makes the invisible visible and transforms diffuse climate risks into addressable fields of action.

The benefits are enormous: cities can see at a glance where heat islands occur, how effectively green spaces cool, which streets are particularly polluted and where the risk to vulnerable groups is highest. Thermal function maps are therefore not only a diagnostic tool, but also a navigation aid for climate-resilient urban development. Without them, urban planning risks literally missing the crux of the problem.

From data collection to planning practice: how thermal function maps are created

The production of a thermal function map begins with systematic data collection. First, all available sources are examined: Satellite images provide area-wide temperature information, but only with limited resolution. Drone flights allow detailed images to be taken, for example to record roof and façade temperatures or to identify heat spots in backyards. Stationary sensors are also used at later hotspots such as streets, squares and parks. These can continuously record temperature, humidity, wind speed and even surface material.

Mobile measurements are an increasingly important instrument. Vehicles with sensors drive along defined routes and create high-resolution temperature profiles of entire streets. In this way, local peculiarities are recognized, such as heat accumulation at heavily sealed intersections or the cooling effect of water surfaces. All this data is fed into powerful GIS systems, which link it with other information. This includes the degree of sealing, vegetation structures, building density, height profiles and even land use patterns.

The next step is data modeling. Here, the raw data is cleansed, standardized and interpreted with the help of numerical models. The major challenge lies in correctly weighting the large number of influencing factors – from solar radiation and the heat storage capacity of building materials to ventilation through wind tunnels. Modern urban climate modelers use specialized software, such as ENVI-met, PALM or urban CFD models. These tools simulate how heat spreads in urban areas, how temperature fields change under different weather conditions and what role individual structures play.

The actual thermal function maps only emerge from this modeling. They visualize on several levels: Surface temperatures, air temperature at different altitudes, heat load at different times of day, potential fresh air corridors or heat radiation from buildings. Difference maps are particularly valuable as they show the before and after comparison of new designs or simulate the effect of planned measures. The forms of presentation range from simple color gradients to interactive web applications that planners can use to run through scenarios.

Finally, the real work begins: the interpretation of the maps by interdisciplinary teams. Urban planners, landscape architects, engineers and administrators discuss the results, identify risks and opportunities, prioritize measures and develop urban development, landscape planning and technical solutions on this basis. This is where data becomes real planning – and planning becomes real change.

Thermal function maps as a game changer for climate-resilient urban development

Hardly any other tool has changed urban and landscape planning as fundamentally in recent years as the thermal function map. In times of increasing heat waves, urban drought and growing population density, the weak points of existing neighborhoods are ruthlessly exposed. Suddenly, schools are recognized as heat traps, parks are identified as life-saving oases and previously ignored backyards become key zones for fresh air supply. The maps provide the basis for developing targeted measures and simulating their effectiveness in advance.

The city of Freiburg im Breisgau provides a particularly impressive example. Based on thermal function maps, targeted measures were implemented there to green roofs and façades, unseal squares and create new fresh air corridors. The results are measurable: surface temperatures in particularly polluted districts have been reduced by several degrees, making hot days noticeably more bearable for the population. Cities such as Vienna, Zurich and Basel are pursuing similar approaches – each with their own focus, but always with the thermal function map as a compass.

Thermal function maps have also become indispensable in urban land-use planning. They help to select locations for new residential districts in such a way that natural cold air flows are not blocked and enable a climate-optimized arrangement of buildings, streets and green spaces. Innovative cities are going even further and integrating the maps into digital twins so that every planned measure can be checked for its climate impact in real time. The result: planning becomes more robust, more sustainable and better adapted to the needs of a changing urban society.

But the benefits go far beyond traditional planning. Thermal function maps are a key tool for heat action plans that ensure the protection of particularly vulnerable population groups such as children, the elderly or the chronically ill. They help to prioritize emergency measures, designate cooling zones, plan drinking water points or set up targeted communication campaigns. In combination with social data, a precise early warning system is created for the city – and thus a new understanding of resilience.

Ultimately, thermal function maps also change the culture of planning. They promote dialog between specialist disciplines, make complex interrelationships clear and enable unprecedented transparency for politicians and the public. Where abstract climate studies used to disappear in thick folders, today colored maps speak an unmistakable language – and thus drive the change towards climate-resilient urban development.

Rethinking interdisciplinary planning: collaboration, innovation and challenges

The introduction of thermal function maps into planning practice is far more than just a technical upgrade. It changes the way teams work together, how decisions are made and how knowledge is shared. Suddenly, it’s no longer just urban planners and landscape architects at the table, but also climate researchers, data analysts, social scientists and IT experts. Everyone contributes their own perspective – and the thermal function map becomes the common frame of reference, the “lingua franca” of interdisciplinary dialog.

In practice, this means that planning teams develop a new understanding of the interactions between their disciplines. The landscape architect can quantify the effect of a new park on the microclimate, the traffic planner recognizes the climatic significance of street design, the architect examines how the choice of materials and façade design affect heat development. The maps open up opportunities for co-creation, where ideas can be quickly tested, discarded or further developed – all on a shared, data-based foundation.

One outstanding example is the city of Vienna, where interdisciplinary teams examined neighborhoods specifically for heat stress as part of the “cool streets” project and developed measures such as mobile shade dispensers, unsealing and temporary water elements in an iterative process. The thermal function map served as a central planning and communication tool that made the effects directly visible. Citizens were able to participate in the discussion of measures and understand how changes affect their surroundings.

But with innovation comes new challenges. The integration of thermal function maps into existing planning processes requires considerable investment in technology, training and organizational development. Many administrations are faced with the question of how to build up the necessary skills, which data standards should apply and how cooperation with external partners should be structured. Data protection and data sovereignty are constant companions, especially when real-time data is collected from public spaces. A high degree of sensitivity and transparency is required here in order to gain the trust of the public and prevent misuse.

Despite all the hurdles, practice shows that the gains in planning quality, efficiency and innovation dynamics are enormous. Interdisciplinary teams that use thermal function maps as a connecting element become faster, more precise and more creative. They are able to address complex challenges holistically and develop solutions that are technically, socially and ecologically convincing. Those who take this path today will create the basis for urban development that not only reacts to climate change, but actively counters it.

Opportunities, risks and the way forward: thermal function maps as the key to a resilient city

When it comes to the future of urban planning, there is no way around thermal function maps. They are the tool with which cities can not only survive climate change, but also shape it. However, as with any innovation, there is light and shade. A key risk lies in the quality of the data. Incomplete, incorrect or misinterpreted data can lead to wrong decisions. Continuous validation and quality assurance is therefore essential – both in data collection and in modeling.

Another issue is data protection. The collection of real-time data from public spaces in particular – for example through mobile sensor technology or citizen science – generates sensitive information that must not fall into the wrong hands. Clear regulations, technical safeguards and open communication with the public are essential here. This is the only way to create the necessary trust for thermal function maps to be fully effective.

The danger of technocratic overcontrol is also real. Those who rely exclusively on data and simulations risk losing sight of social and cultural aspects. The best maps are of little use if they are not embedded in a broad participation process. This is why thermal function maps must always be seen as a tool – not as a substitute for discourse, but as its catalyst. They can help to convey complex interrelationships, highlight options and make decisions transparent. However, the responsibility for the city always remains with the people.

At the same time, thermal function maps offer enormous opportunities. They enable climate-oriented neighborhood development, promote innovation in the construction industry and support adaptation to new challenges such as extreme weather or demographic change. They make cities more resilient, more liveable and more sustainable. Above all, however, they help to use resources in a targeted manner and make the impact of measures measurable. This not only makes ecological sense, but also economic sense – because every euro that flows into the right measure saves subsequent costs due to heat damage, health problems or infrastructure failure.

The only way forward is therefore to consistently integrate thermal function maps into all levels of planning. This requires investment, courage and staying power – but it is the only option for cities that want to meet the challenges of the 21st century. Those who lay the foundations today will be among the winners of urban climate change tomorrow. And the question may soon no longer be whether thermal function maps will be used – but how we could ever plan without them.

Conclusion: Thermal function maps are far more than technical accessories – they are the foundation of sustainable, climate-resilient urban development. They make the invisible visible, promote cooperation across disciplinary boundaries and enable planning that not only reacts to change, but also shapes it. Those who use them correctly will create liveable cities, even in times of extreme heat and growing uncertainty. The future belongs to municipalities and planning teams that have the courage to rely on data-based, transparent and participatory tools – and thus take the climate of their city into their own hands. For all our love of creativity, without solid thermal function maps, visions of a liveable city are just a hot dream.

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