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@ARTICLE{Rotzer:834972,
      author       = {Rotzer, Kathrina and Montzka, Carsten and Entekhabi, Dara
                      and Konings, Alexandra G. and McColl, Kaighin A. and Piles,
                      Maria and Vereecken, Harry},
      title        = {{R}elationship {B}etween {V}egetation {M}icrowave {O}ptical
                      {D}epth and {C}ross-{P}olarized {B}ackscatter {F}rom
                      {M}ultiyear {A}quarius {O}bservations},
      journal      = {IEEE journal of selected topics in applied earth
                      observations and remote sensing},
      volume       = {10},
      number       = {10},
      issn         = {2151-1535},
      address      = {New York, NY},
      publisher    = {IEEE},
      reportid     = {FZJ-2017-04842},
      pages        = {4493 - 4503},
      year         = {2017},
      abstract     = {Soil moisture retrieval algorithms based on passive
                      microwave remote sensing observations need to account for
                      vegetation attenuation and emission, which is generally
                      parameterized as vegetation optical depth (VOD). This
                      multisensor study tests a new method to retrieve VOD from
                      cross-polarized radar backscattering coefficients. Three
                      years of Aquarius/SAC-D data were used to establish a
                      relationship between the cross-polarized backscattering
                      coefficient σHV and VOD derived from a multitemporal
                      passive dual-channel algorithm (VODMT). The dependence of
                      the correspondence is analyzed for different land use
                      classes. There are no systematic differences in the slope
                      for woody versus nonwoody vegetation, resulting in a strong
                      correlation $(80\%$ explained-variance) and a global linear
                      relationship when all classes are combined. The relationship
                      is stable over the years of observations. The comparison of
                      the Aquarius-derived VODMT to Soil Moisture and Ocean
                      Salinity's multi-angular VOD estimates shows similar spatial
                      patterns and temporal behavior, evident in high
                      correlations. However, VODMT has considerably higher mean
                      values, but lower dynamic range globally. Most of the
                      differences can be attributed to differences in instrument
                      sampling. The main result of this study, a relationship
                      between backscatter and VOD, will permit high-resolution
                      mapping of VOD with synthetic aperture radar measurements.
                      These maps allow future studies of scaling and heterogeneity
                      effects of vegetation on soil moisture retrieval at the
                      coarser scales of land microwave radiometry. The study shows
                      that VOD based on passive measurements and predicted by
                      active measurements are comparable globally and that the
                      breakdown by land cover classification does not affect the
                      relationship appreciably.},
      cin          = {IBG-3},
      ddc          = {520},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000412626500022},
      doi          = {10.1109/JSTARS.2017.2716638},
      url          = {https://juser.fz-juelich.de/record/834972},
}