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@INPROCEEDINGS{Brogi:1034152,
      author       = {Brogi, Cosimo and Bogena, Heye and Capitanio, Emilio and
                      Rocha, Alby Duarte and Nieberding, Felix and Huisman, Johan
                      Alexander},
      title        = {{U}se of satellite-based vegetation indices and thermal
                      neutron intensities to investigate biomass effects on roving
                      {CRNS} measurements},
      reportid     = {FZJ-2024-06963},
      year         = {2024},
      abstract     = {The use of roving cosmic-ray neutron sensors (CRNS) can
                      provide soil moisture (SM) information over large areas.
                      These can be extremely useful, for example, in the
                      validation of land-surface models and satellite-based SM
                      products. However, there are challenges in roving CRNS
                      applications that are not yet resolved. For instance,
                      detailed biomass information is often needed to obtain
                      accurate SM estimates.Between June and November 2023, five
                      roving CRNS measurements were performed in the Selke River
                      catchment (Saxony Anhalt, Germany) as part of a joint field
                      campaign of the CosmicSense project. Over 1000 km of
                      measurements were conducted with the FZJ rover (Hydroinnova
                      LLC, Albuquerque, NM, USA) that was equipped with 36
                      detector tubes. Of these tubes, 20 were moderated by 25 mm
                      high density polyethylene (HDPE) to measure neutrons in the
                      epithermal energy regime while 16 tubes were left bare to
                      shift the measured energy towards the thermal energy
                      regime.In addition, 19 stationary CRNS along different land
                      covers of the study area were available for support. Four of
                      these were CRS-2000 (Hydroinnova LLC, Albuquerque, NM, USA)
                      equipped with moderated and bare detectors that were placed
                      in agricultural areas. Vegetation indices such as NDVI were
                      derived from Sentinel-2 satellite images at 10 m resolution
                      to estimate/proxy biomass close to the roving dates.
                      Additionally, land cover and land use information were used
                      to stratify the study area into the most representative
                      cover types.The temporal and spatial relationships between
                      satellite-based vegetation indices and thermal or epithermal
                      neutron intensities were investigated. The SM estimated from
                      epithermal neutrons was compared with data from the
                      available stationary CRNS and from in-situ measurements and
                      samples. It was then explored whether thermal neutron
                      intensities can be used to improve roving SM estimates by
                      providing on-the-fly corrections of epithermal measurements
                      for the surrounding biomass.},
      month         = {Sep},
      date          = {2024-09-24},
      organization  = {7th International COSMOS Workshop,
                       Royal Hillsborough (UK), 24 Sep 2024 -
                       26 Sep 2024},
      subtyp        = {Other},
      cin          = {IBG-3},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {2173 - Agro-biogeosystems: controls, feedbacks and impact
                      (POF4-217) / DFG project G:(GEPRIS)357874777 - FOR 2694:
                      Large-Scale and High-Resolution Mapping of Soil Moisture on
                      Field and Catchment Scales - Boosted by Cosmic-Ray Neutrons
                      (357874777)},
      pid          = {G:(DE-HGF)POF4-2173 / G:(GEPRIS)357874777},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/1034152},
}