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Dr. rer. nat. F.J. Ellsäßer (Florian)

Assistant Professor

About Me

I am an Assistant Professor in the Department of Natural Resources, Faculty of Geo-information Science and Earth Observation. My research and teaching interests and activities focus on the monitoring of agricultural and forestry landscapes and the estimation and modelling of (bio-)physical and ecological processes. For this I work with a wide range of data such as satellite, UAV/drone and field camera images as well as weather, soil and crop information to create physical, data- and process-based models. I am particularly interested in the impact of weather events and climate change on agriculture and ways to support resilient and sustainable agriculture by gaining information about crops and stress events. This information is generated through the application of hydrological and land-atmosphere models as well as process-based crop models using remote sensing and field time-series data. Based on this, it is of great interest to me to combine the advantages of optical and thermal satellite data with high resolution time series from field cameras or UAVs to provide models that cover larger areas while at the same time provide high accuracy through in-situ data calibration. To support these and a wide range of other research and teaching interests I am working on the establishment of a JECAM site in the vicinity of the University of Twente. This research site will provide detailed agricultural and forestry information for calibration and verification of remotely sensed observations and will create a unique data base for spatial-time series data by measuring weather and soil parameters and provide data by field sensors and repetitive UAV surveys.

Before joining ITC and the University of Twente in 2023, I obtained a BSc degree in Environmental Management at Justus-Liebig University Gießen, a European Double Degree MSc in Environmental Sciences – Soil, Water and Biodiversity (EnvEuro) at University of Hohenheim and University of Natural Resources and Life Sciences Vienna (Boku) and a PhD from Georg-August University Göttingen. My PhD was on the testing and development of methods to calculate evapotranspiration from UAV/drone-recorded images of land surface temperatures in oil palm and forest landscapes in the framework of the EFForTS Collaborative Research Centre. As a Post-Doctoral researcher I worked in the ClimXtreme research network in the CROP project on the impact of compound and extreme weather events on crops at the Center for International Development and Environmental Research (ZEU) at Justus-Liebig University Gießen.

Organisations

Publications

Recent
Cortés‐Molino, Á., Valdés‐Uribe, A. , Ellsäßer, F., Bulusu, M., Ahongshangbam, J., Hendrayanto, Hölscher, D., & Röll, A. (2024). Combining UAV thermography, point cloud analysis and machine learning for assessing small‐scale evapotranspiration patterns in a tropical rainforest. Ecohydrology, 17(1), 1-13. Article e2604. https://doi.org/10.1002/eco.2604
Xoplaki, E. , Ellsäßer, F., Grieger, J., Nissen, K., Pinto, J. G., Augenstein, M., Chen, T.-C., Feldmann, H., Friederichs, P., Gliksman, D., Goulier, L., Haustein, K., Heinke, J., Jach, L., Knutzen, F., Kollet, S., Luterbacher, J., Luther, N., Mohr, S., ... Wolf, F. (2023). Compound events in Germany in 2018: drivers and case studies. (Egusphere). https://doi.org/10.5194/egusphere-2023-1460
Bulusu, M. , Ellsäßer, F., Stiegler, C., Ahongshangbam, J., Marques, I., Hendrayanto, H., Röll, A., & Hölscher, D. (2023). UAV-based thermography reveals spatial and temporal variability of evapotranspiration from a tropical rainforest. Frontiers in Forests and Global Change, 6, 1-10. https://doi.org/10.3389/ffgc.2023.1232410
Röll, A., Kang, T., Hahn, P., Ahongshangbam, J. , Ellsäßer, F., Hendrayanto, Sharma, P., Wintz, T., & Hölscher, D. (2023). Complex canopy structures control tree transpiration: A study based on 3D modelling in a tropical rainforest. Hydrological processes, 37, 1-14. Article e15045. https://doi.org/10.1002/hyp.15045
Rousi, E., Fink, A. H., Andersen, L. S., Becker, F. N., Beobide-Arsuaga, G., Breil, M., Cozzi, G., Heinke, J., Jach, L., Niermann, D., Petrovic, D., Richling, A., Riebold, J., Steidl, S., Suarez-Gutierrez, L., Tradowsky, J. S., Coumou, D., Düsterhus, A. , Ellsäßer, F., ... Xoplaki, E. (2023). The extremely hot and dry 2018 summer in central and northern Europe from a multi-faceted weather and climate perspective. Natural hazards and earth system sciences. https://doi.org/10.5194/nhess-23-1699-2023
Zemp, D. C., Guerrero-Ramirez, N., Brambach, F., Darras, K., Grass, I., Potapov, A., Röll, A., Arimond, I., Ballauff, J., Behling, H., Berkelmann, D., Biagioni, S., Buchori, D., Craven, D., Daniel, R., Gailing, O. , Ellsäßer, F., Fardiansah, R., Hennings, N., ... Kreft, H. (2023). Tree islands enhance biodiversity and functioning in oil palm landscapes. Nature, 618, 316-321. https://doi.org/10.1038/s41586-023-06086-5
Ellsäßer, F. J., Stiegler, C., Röll, A., June, T., Hendrayanto, H., Knohl, A., & Hölscher, D. (2021). Predicting evapotranspiration from drone-based thermography – a method comparison in a tropical oil palm plantation. Biogeosciences, 18(3), 861-872. https://doi.org/10.5194/bg-18-861-2021
Donfack, L. S., Röll, A. , Ellsäßer, F. J., Ehbrecht, M., Irawan, B., Hölscher, D., Knohl, A., Kreft, H., Siahaan, E. J., Sundawati, L., Stiegler, C., & Zemp, D. C. (2021). Microclimate and land surface temperature in a biodiversity enriched oil palm plantation. Forest ecology and management, 497, Article 119480. https://doi.org/10.1016/j.foreco.2021.119480
Donfack, L. S., Röll, A. , Ellsäßer, F., Ehbrecht, M., Irawan, B., Hölscher, D., Knohl, A., Kreft, H., Siahaan, E. J., Sundawati, L., Stiegler, C., & Zemp, C. D. (2021). Dataset on microclimate and drone-based thermal patterns within an oil palm agroforestry system. Data in brief, 39, Article 107615. https://doi.org/10.1016/j.dib.2021.107615
Ellsäßer, F. J., Röll, A., Stiegler, C., Hendrayanto, H., & Hölscher, D. (2020). Introducing QWaterModel, a QGIS plugin for predicting evapotranspiration from land surface temperatures. Environmental modelling & software, 130, 1-6. Article 104739. https://doi.org/10.1016/j.envsoft.2020.104739

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Visiting Address

University of Twente
Faculty of Geo-Information Science and Earth Observation
Langezijds (building no. 19), room 1119
Hallenweg 8
7522NH  Enschede
The Netherlands

Mailing Address

University of Twente
Faculty of Geo-Information Science and Earth Observation
Langezijds  1119
P.O. Box 217
7500 AE Enschede
The Netherlands

Organisations

University of Twente Drienerlolaan 5
7522 NB Enschede
+31 (0)53 489 9111
info@utwente.nl
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