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@ARTICLE{Babaeian:203408,
      author       = {Babaeian, Ebrahim and Homaee, Mehdi and Vereecken, Harry
                      and Montzka, Carsten and Norouzi, Ali Akbar and van
                      Genuchten, Martinus Th.},
      title        = {{A} {C}omparative {S}tudy of {M}ultiple {A}pproaches for
                      {P}redicting the {S}oil–{W}ater {R}etention {C}urve:
                      {H}yperspectral {I}nformation vs. {B}asic {S}oil
                      {P}roperties},
      journal      = {Soil Science Society of America journal},
      volume       = {79},
      number       = {4},
      issn         = {0361-5995},
      address      = {Madison, Wis.},
      publisher    = {SSSA},
      reportid     = {FZJ-2015-05351},
      pages        = {1043-1058},
      year         = {2015},
      abstract     = {Information about the soil–water retention curve is
                      necessary for modeling water flow and solute transport
                      processes in soils. Soil spectroscopy in the visible,
                      near-infrared, and shortwave infrared (Vis-NIR-SWIR) range
                      has been widely used as a rapid, cost-effective and
                      nondestructive technique to predict soil properties.
                      However, less attention has been paid to predict soil
                      hydraulic properties using soil spectral data. In this
                      paper, spectral reflectances of soil samples from the
                      Zanjanrood watershed, Iran, were measured in the
                      Vis-NIR-SWIR ranges (350–2500 nm). Stepwise multiple
                      linear regression coupled with the bootstrap method was used
                      to construct predictive models and to estimate the
                      soil–water retention curve. We developed point and
                      parametric transfer functions based on the van Genuchten
                      (VG) and Brooks-Corey (BC) soil hydraulic models. Three
                      different types of transfer functions were developed: (i)
                      spectral transfer functions (STFs) that relate VG/BC
                      hydraulic parameters to spectral reflectance values, (ii)
                      pedotransfer function (PTFs) that use basic soil data as
                      input, and (iii) PTFs that consider spectral data and basic
                      soil properties, further referred to as spectral
                      pedotransfer functions (SPTFs). We also derived and
                      evaluated point transfer functions which estimate
                      soil–water contents at specific matric potentials. The
                      point STFs and SPTFs were found to be accurate at low and
                      intermediate water contents (R2 > 0.50 and root mean squared
                      error [RMSE] < 0.018 cm3 cm−3), while the point PTFs
                      performed better close to saturation. The parametric STFs
                      and SPTFs of both the VG and BC models performed similarly
                      to parametric PTFs in estimating the retention curve. The
                      best predictions of soil–water contents were obtained for
                      all the three transfer functions when the VG and BC
                      retention models were fitted to the retention points
                      estimated by the point transfer functions. Overall, our
                      findings indicate that spectral data can provide useful
                      information to predict soil—water contents and the
                      soil–water retention curve. However, there is a need to
                      extend and validate the derived transfer functions to other
                      soils and regions.},
      cin          = {IBG-3},
      ddc          = {550},
      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:000361048300005},
      doi          = {10.2136/sssaj2014.09.0355},
      url          = {https://juser.fz-juelich.de/record/203408},
}