@article{fdi:010042569,
  title = {{C}orrection of aerosol effects on multi-temporal images acquired with constant viewing angles : application to {F}ormosat-2 images},
  author = {{H}agolle, {O}. and {D}edieu, {G}. and {M}ougenot, {B}ernard and {D}ebaecker, {V}. and {D}uchemin, {B}eno{\^i}t and {M}eygret, {A}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}his paper presents a new method developed for the atmospheric correction of the images that will be acquired by the {V}en mu s satellite after its launch expected in early 2010. {E}very two days, the {V}en mu s mission will provide 10 m resolution images of 50 sites, in 12 narrow spectral bands ranging from 415 run to 910 nm. {T}he sun-synchronous {V}en mu s orbit will have a 2-day repeat cycle, and the images of a given site will always be acquired from the same place, at the same local hour, with constant observation angles. {T}hanks to these characteristics, the directional effects will be considerably reduced since only the solar angles will slowly vary with time. {T}he algorithm that will be implemented for the atmospheric correction of {V}en mu s data is being developed using both radiative transfer simulations and the actual data acquired by the {F}ormosat-2 satellite. {B}ecause of its one-day sun-synchronous repeat cycle, {F}ormosat-2 acquires images with a sun-viewing geometry close to the one {V}en mu s will offer. {W}ith this geometry, reflectance time series are free from directional effects on the short term, a feature which reduces the number of unknowns to retrieve. {T}he atmospheric corrections algorithm exploits this feature and the two following assumptions: - {A}erosol optical properties vary quickly with time but slowly with location. - {S}urface reflectances vary quickly with location but slowly with time. {C}onsequently, the top of atmosphere reflectance short term variations (10 to 15 days) are mainly due to the variations of aerosol optical properties, and it is thus possible to use these variations to characterise the atmospheric aerosols and to retrieve surface reflectances. {T}his paper first describes the aerosol inversion method we developed and its results when applied to simulations. {I}n the second part, we show the first tests of the method against three data sets acquired by {F}ormosat-2 images with constant observation angles. {A}eronet sun photometers measurements were available on all sites. {F}ormosat-2 estimates of optical thickness compare favourably with {A}eronet in situ measurements, leading to a noticeable improvement of the smoothness of time series of surface reflectances after atmospheric correction.},
  keywords = {atmospheric correction ; aerosols ; multi temporal measurement ; ven mu s ; formosat 2 ; constant viewing angle},
  booktitle = {},
  journal = {{R}emote {S}ensing of {E}nvironment},
  volume = {112},
  numero = {4},
  pages = {1689--1701},
  ISSN = {0034-4257},
  year = {2008},
  DOI = {10.1016/j.rse.2007.08.016},
  URL = {https://www.documentation.ird.fr/hor/fdi:010042569},
}