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Stefan Simis

Earth Observation Scientist (Inland Waters)

Contact Details


Stefan is a phytoplankton ecologist with a keen interest in optical observation technology, ranging from in situ measurements to remote sensing, based in laboratory, field, and numerical studies. Cyanobacteria detection and ecophysiology are of particular interest. His current work focuses on the use of earth observation platforms to produce water quality information for inland and coastal waters, including algorithm development, calibration/validation studies, and large scale data processing. Collaborating with modelling and socioeconomics experts at PML he also contributes to the development of Earth Observation solutions for aquaculture and environmental risk mapping.



Tools for Assessment and Planning of Aquaculture Sustainability (TAPAS)

Contact: Stefan Simis

The Tools for Assessment and Planning of Aquaculture Sustainability (TAPAS) project is working to create cost-efficient management tools and...

Other key projects

  • Improved monitoring and forecasting of ecological status of European INland waters by combining Future earth ObseRvation data and Models INFORM
  • EartH2Observe
  • Copernicus Global Land Service – Lake Water

Recent publications

  • Qin, P; Simis, SGH; Tilstone, GH. 2017 Radiometric validation of atmospheric correction for MERIS in the Baltic Sea based on continuous observations from ships and AERONET-OC. Remote Sensing of Environment, 200. 263-280. (In Press)
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  • Groetsch, PMM; Gege, P; Simis, SGH; Eleveld, MA; Peters, SWM. 2017 Variability of adjacency effects in sky reflectance measurements. Optics Letters, 42 (17). 3359. 10.1364/OL.42.003359
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  • Groetsch, PMM; Gege, P; Simis, SGH; Eleveld, MA; Peters, SWM. 2017 Validation of a spectral correction procedure for sun and sky reflections in above-water reflectance measurements. Optics Express, 25 (16). A742. 10.1364/OE.25.00A742
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  • Simis, SGH; Ylöstalo, P; Kallio, KY; Spilling, K; Kutser, T. 2017 Contrasting seasonality in optical-biogeochemical properties of the Baltic Sea. PLOS ONE, 12 (4). e0173357. 10.1371/journal.pone.0173357
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  • Houliez, E; Simis, SGH; Nenonen, S; Ylöstalo, P; Seppälä, J. 2017 Basin-scale spatio-temporal variability and control of phytoplankton photosynthesis in the Baltic Sea: The first multiwavelength fast repetition rate fluorescence study operated on a ship-of-opportunity. Journal of Marine Systems, 169. 40-51. 10.1016/j.jmarsys.2017.01.007
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  • Markelin, L; Simis, SGH; Hunter, P; Spyrakos, E; Tyler, A; Clewley, D; Groom, SB. 2017 Atmospheric Correction Performance of Hyperspectral Airborne Imagery over a Small Eutrophic Lake under Changing Cloud Cover. Remote Sensing, 9 (1). 2-22. 10.3390/rs9010002
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Selected key publications

Groetsch, P.M.M., Simis, S.G.H., Eleveld, M.A., & Peters, S.W.M. (2014). Cyanobacterial bloom detection based on coherence between ferrybox observations. Journal of Marine Systems, 140, Part A, 50-58

Lawrenz, E., Silsbe, G., Capuzzo, E., Ylöstalo, P., Forster, R.M., Simis, S.G.H., Prášil, O., Kromkamp, J.C., Hickman, A.E., Moore, C.M., Forget, M.-H., Geider, R.J., & Suggett, D.J. (2013). Predicting the Electron Requirement for Carbon Fixation in Seas and Oceans. PloS one, 8, e58137

Simis, S.G.H., & Olsson, J. (2013). Unattended processing of shipborne hyperspectral reflectance measurements. Remote Sensing of Environment, 135, 202–212

Martinez-Vicente, V., Simis, S.G.H., Alegre, R., Land, P.E., & Groom, S.B. (2013). Above-water reflectance for the evaluation of adjacency effects in Earth observation data: initial results and methods comparison for near-coastal waters in the Western Channel, UK. Journal of the European optical society - rapid publications, 8

Simis, S.G.H., & Kauko, H.M. (2012). In vivo mass-specific absorption spectra of phycobilipigments through selective bleaching. Limnol. Oceanogr.: Methods, 10, 214-226

Simis, S.G.H., Huot, Y., Babin, M., Seppälä, J., & Metsamaa, L. (2012). Optimization of variable fluorescence measurements of phytoplankton communities with cyanobacteria. Photosynthesis Research, 112, 13-30

Other activities

  • PML: Athena Swan Committee, Library Committee
  • PONDER steering committee (RBINS, Belgium)