@article{PAR00010732,
  title = {{E}valuating the semiempirical {H}-{Q} model used to calculate the {L}-band emissivity of a rough bare soil},
  author = {{L}awrence, {H}. and {W}igneron, {J}. {P}. and {D}emontoux, {F}. and {M}ialon, {A}. and {K}err, {Y}ann},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n this paper, a numerical modeling approach was used to evaluate the semiempirical {H}-{Q} model used in the {S}oil {M}oisture and {O}cean {S}alinity ({SMOS}) retrieval algorithm to account for roughness effects over bare soil. {T}he {H}-{Q} model uses four parameters, {H}-{R}, {Q}({R}), {N}-{RH}, and {N}-{RV}, which are usually calibrated at the ground scale for different surface types. {T}he aim of this paper is to investigate whether these empirical parameters could be linked to the physical roughness parameters of standard deviation of surface heights sigma and autocorrelation length {L}-c. {F}irst, a numerical modeling approach was used to calculate rough soil emissivities for different roughness and soil moisture conditions. {S}econd, {H}-{Q} model parameters were retrieved by minimizing a cost function between these emissivities and those calculated by the {H}-{Q} model. {I}t was found that the retrieved {H}-{R} could be related directly to {Z}s = sigma(2)/{L}-c and that {Q}({R}), {N}-{RV}, and {N}-{RH} were dependent on {H}-{R}. {H}-{R} was found to have a negligible dependence on soil moisture. {B}ased on these results, a new model was proposed where the four {H}-{Q} model parameters were calibrated to {Z}s. {T}his model was tested on the {PORTOS} 1993 data set and found to yield a root-mean-square difference between the retrieved and measured soil moisture values of similar to 0.03 m(3)/m(3), which was within the desired 0.04-m(3)/m(3) error margin for the {SMOS} mission.},
  keywords = {{M}odeling ; passive microwave remote sensing ; rough surfaces ; soil ; moisture retrievals},
  booktitle = {},
  journal = {{IEEE} {T}ransactions on {G}eoscience and {R}emote {S}ensing},
  volume = {51},
  numero = {7},
  pages = {4075--4084},
  ISSN = {0196-2892},
  year = {2013},
  DOI = {10.1109/tgrs.2012.2226995},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00010732},
}