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This paper reports on a recent field campaign that aims to collect time-series multi-frequency microwave data over winter wheat during the entire growth cycle. The data are being collected to characterize vegetation dynamics and to quantify its effects on soil moisture retrievals. A C-band radar was recently incorporated within the existing L-band radar/radiometer system called ComRAD (SMAP's ground...
In microwave radiometry of vegetation canopies, the most important contributor to the emission is the long vegetation constituents such as tree trunks and primary branches. Their scattering pattern depends strongly on both shape and orientation. Since they are a dominant contributor to the emission, their scattering pattern must be taken into account properly when solving radiative transfer (RT) equations...
The Hubble Space Telescope (HST) finds
galaxies whose Tolman dimming exceeds 10 mag. Could evolution alone explain these as our ancestor galaxies or could they be representatives of quite a different dynasty whose descendants are no longer prominent today? We explore the latter hypothesis and argue that surface brightness selection effects naturally bring into focus quite different dynasties from...
L-band radiometry is recognized as a technique with a significant potential for providing spatial and temporal soil moisture variations [1, 2]. As a result, satellite missions dedicated to global soil moisture monitoring have been proposed. A 2D-interferometric L-band radiometer has recently been launched onboard the European SMOS (Soil moisture and Ocean Salinity) satellite, [3], and the NASA is...
Vegetation scattering problems in L band contain plant or tree components in the near field of each other. In this case, the interleaf or inter-branch interaction effect becomes more significant. In this paper, scattering properties from a cluster of plant or tree components are analyzed to study the interaction effect in the cluster. A numerical approach, the Discrete Dipole Approximation, is applied...
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