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@MASTERSTHESIS{Krieger:864305,
      author       = {Krieger, Vera},
      othercontributors = {Matveeva, Maria and Rascher, Uwe},
      title        = {{Q}uantitative evaluation of airborne maps of solar-induced
                      fluorescence to determine the performance of different
                      retrieval methods},
      school       = {Rheinische Friedrich-Wilhelms-Universität Bonn},
      type         = {Masterarbeit},
      reportid     = {FZJ-2019-04120},
      pages        = {106 p.},
      year         = {2018},
      note         = {Masterarbeit, Rheinische Friedrich-Wilhelms-Universität
                      Bonn, 2018},
      abstract     = {When plants absorb light, not all energy is converted by
                      photosynthesis, but excessenergy is released as heat or
                      emitted as Solar-induced chlorophyll Fluorescence ( F ).This
                      signal, related to the photosynthetic efficiency of plants,
                      has been intensivelystudied and measured from ground level
                      up to global scale. However, retrieving ( F )from airborne
                      data is challenging because scattering effects and other
                      atmosphericinfluences must be taken into account here. A
                      common method of testing thereliability of a F product (in
                      this study airborne F maps) is the comparison to groundtruth
                      data where the atmosphere can be neglected. In this work
                      another possibilityof assessing the quality of the airborne
                      F maps is tested, which does not requireground reference
                      measurements. For this purpose we have developed so-called
                      ’qualitycriteria’, which should help to find errors and
                      artifacts that have arisen during Fretrieval. This method
                      was used to test the quality of the airborne F maps of
                      2016campaign retrieved from iFLD and SFM.By applying the
                      quality criteria, clear differences in the performance of
                      two retrievalswere found. Although it was shown that both
                      retrievals performed well in F 760retrieval, even at places
                      with changes from vegetated to non-vegetated sites onpixel
                      scale, iFLD was more robust for retrieving correct absolute
                      values for F 760 andF 687 , while SFM performed less
                      accurate in this term, over- and underestimating Fvalues.
                      Furthermore, previously reported problems with image
                      pre-processing (decon-volution for correcting PSF) of SFM
                      became clear here. This was causing strongartifacts in F 687
                      retrievals from SFM. However, SFM proved to be the more
                      suitablemethod for identifying small differences on pixel
                      scale. Moreover, this algorithmdid not show systematic
                      variations over entire flight lines as observed by the
                      useof iFLD. The physically-based approach of atmospheric
                      correction used with SFMthus provided more interference-free
                      F maps than the semi-empirical correction
                      usingnon-fluorescent surfaces used in iFLD retrieval.
                      Testing F retrievals on vegetationunder different
                      illumination conditions showed the necessity to calculate F
                      yield forquantification of photosynthesis rates.The
                      application of the proposed quality features proved to be a
                      valuable tool forassessing the performance of F retrieval on
                      airborne maps. This is why we propose touse the quality
                      criteria even when sufficient ground references are
                      available, becauseeven if they do not replace ground-truth
                      data, they provide important additionalinformation about the
                      quality of the F product of the respective retrieval
                      method.},
      cin          = {IBG-2},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {582 - Plant Science (POF3-582)},
      pid          = {G:(DE-HGF)POF3-582},
      typ          = {PUB:(DE-HGF)19},
      url          = {https://juser.fz-juelich.de/record/864305},
}