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@ARTICLE{Colliander:827220,
      author       = {Colliander, A. and Jackson, T. J. and Bindlish, R. and
                      Chan, S. and Das, N. and Kim, S. B. and Cosh, M. H. and
                      Dunbar, R. S. and Dang, L. and Pashaian, L. and Asanuma, J.
                      and Aida, K. and Berg, A. and Rowlandson, T. and Bosch, D.
                      and Caldwell, T. and Caylor, K. and Goodrich, D. and al
                      Jassar, H. and Lopez-Baeza, E. and Martínez-Fernández, J.
                      and González-Zamora, A. and Livingston, S. and McNairn, H.
                      and Pacheco, A. and Moghaddam, M. and Montzka, C. and
                      Notarnicola, C. and Niedrist, G. and Pellarin, T. and
                      Prueger, J. and Pulliainen, J. and Rautiainen, K. and Ramos,
                      J. and Seyfried, M. and Starks, P. and Su, Z. and Zeng, Y.
                      and van der Velde, R. and Thibeault, M. and Dorigo, W. and
                      Vreugdenhil, M. and Walker, J. P. and Wu, X. and Monerris,
                      A. and O'Neill, P. E. and Entekhabi, D. and Njoku, E. G. and
                      Yueh, S.},
      title        = {{V}alidation of {SMAP} surface soil moisture products with
                      core validation sites},
      journal      = {Remote sensing of environment},
      volume       = {191},
      issn         = {0034-4257},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2017-01414},
      pages        = {215 - 231},
      year         = {2017},
      abstract     = {The NASA Soil Moisture Active Passive (SMAP) mission has
                      utilized a set of core validation sites as the primary
                      methodology in assessing the soil moisture retrieval
                      algorithm performance. Those sites provide well-calibrated
                      in situ soil moisture measurements within SMAP product grid
                      pixels for diverse conditions and locations. The estimation
                      of the average soil moisture within the SMAP product grid
                      pixels based on in situ measurements is more reliable when
                      location specific calibration of the sensors has been
                      performed and there is adequate replication over the spatial
                      domain, with an up-scaling function based on analysis using
                      independent estimates of the soil moisture distribution.
                      SMAP fulfilled these requirements through a collaborative
                      Cal/Val Partner program. This paper presents the results
                      from 34 candidate core validation sites for the first eleven
                      months of the SMAP mission. As a result of the screening of
                      the sites prior to the availability of SMAP data, out of the
                      34 candidate sites 18 sites fulfilled all the requirements
                      at one of the resolution scales (at least). The rest of the
                      sites are used as secondary information in algorithm
                      evaluation. The results indicate that the SMAP
                      radiometer-based soil moisture data product meets its
                      expected performance of 0.04 m3/m3 volumetric soil moisture
                      (unbiased root mean square error); the combined
                      radar-radiometer product is close to its expected
                      performance of 0.04 m3/m3, and the radar-based product meets
                      its target accuracy of 0.06 m3/m3 (the lengths of the
                      combined and radar-based products are truncated to about 10
                      weeks because of the SMAP radar failure). Upon completing
                      the intensive Cal/Val phase of the mission the SMAP project
                      will continue to enhance the products in the primary and
                      extended geographic domains, in co-operation with the
                      Cal/Val Partners, by continuing the comparisons over the
                      existing core validation sites and inclusion of candidate
                      sites that can address shortcomings},
      cin          = {IBG-3},
      ddc          = {050},
      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:000397360500017},
      doi          = {10.1016/j.rse.2017.01.021},
      url          = {https://juser.fz-juelich.de/record/827220},
}