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, and then only when vegetation cover is sufficiently thin that water in the plant canopy does not obscure the ground from the sensor ( Burke et al. 2003 ). An alternative approach, which can sample much more deeply into the soil, and also integrate across a larger footprint than other forms of in situ measurements, exploits properties of cosmic-ray neutron absorption and scattering by soil water ( Zreda et al. 2008 ). Each observational approach provides coverage that is incomplete in time or space
, and then only when vegetation cover is sufficiently thin that water in the plant canopy does not obscure the ground from the sensor ( Burke et al. 2003 ). An alternative approach, which can sample much more deeply into the soil, and also integrate across a larger footprint than other forms of in situ measurements, exploits properties of cosmic-ray neutron absorption and scattering by soil water ( Zreda et al. 2008 ). Each observational approach provides coverage that is incomplete in time or space
