@incollection{fdi:010008381,
  title = {{V}egetation cover study over arid semi-arid areas : use of {ERS}1 wind scatterometer},
  author = {{M}agagi, {R}.{D}. and {K}err, {Y}.{H}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {ERS}-1 wind scatterometer (5.3 {G}hz) operates in {VV} polarization with a resolution of 50 km. {F}or a particular target, it measures three backscattering coefficients from its 3 antennas. {T}he aim of this study is to use the information delivered by the wind scatterometer over land surfaces in arid and semi-arid environments to infer soil moisture. {T}he rationale of the approach presented is that, if we assume that the soil/vegetation interaction term can be ignored, the signal is the sum of soil and vegetation contributions. {T}he soil contribution is driven by the soil's dielectric properties and surface roughness. {I}n the presence of vegetation, this contribution is attenuated by a factor which depends on canopy characteristics (water content, shape, height, density) and radiometer viewing characteristics. {T}o assess and monitor soil moisture, a knowledge of the vegetation characteristics is thus required. {I}n order to quantify the influence of vegetation on the signal, we will use a semi-empirical model (first order radiative transfer model), extract canopy optical thickness (tau) and simple scattering albedo using the angle dependence. {T}he different contributions of the signal will be compared within different angular ranges. {T}he semi-empirical model will be applied at low incidence angles to retrieve soil moisture. ({R}{\'e}sum{\'e} d'auteur)},
  keywords = {{COUVERT} {VEGETAL} ; {HUMIDITE} {DU} {SOL} ; {RADIOMETRIE} ; {TELEDETECTION} {SPATIALE} ; {SATELLITE} {ERS}1 ; {SIMULATION} ; {VARIATION} {TEMPORELLE} ; {ZONE} {ARIDE} ; {ZONE} {SEMIARIDE} ; {NIGER} ; {NIAMEY} {REGION} ; {BANIZOUMBOU} {REGION}},
  booktitle = {{I}nteractions surface continentale/atmosph{\`e}re : l'exp{\'e}rience {HAPEX}-{S}ahel},
  numero = {},
  pages = {619--634},
  address = {{P}aris},
  publisher = {{ORSTOM}},
  series = {{C}olloques et {S}{\'e}minaires},
  year = {1996},
  ISBN = {2-7099-1307-0},
  ISSN = {0767-2896},
  URL = {https://www.documentation.ird.fr/hor/fdi:010008381},
}