TY - GEN
T1 - Measurement and correction of atmospheric effects in O2-B and O2-A absorption bands in the context of sun-induced fluorescence remote sensing
AU - Daumard, F.
AU - Goulas, Y.
AU - Ounis, A.
AU - Pedros, R.
AU - Moya, I.
N1 - Publisher Copyright:
© 2014 IEEE.
PY - 2014/6/28
Y1 - 2014/6/28
N2 - Under sun-light illumination, the shape of the atmospheric oxygen bands (O2-B, 687 nm and O2-A, 760 nm) of the vegetation radiance is modified by chlorophyll fluorescence. However for far-range measurements, atmospheric effects also modify this shape. In this study, measurements in O2-A and O2-B absorption bands have been performed at different altitudes up to 3123 m over bare soil and wheat fields. It is observed that bands depth increase significantly with altitude. In O2-B band, the total magnitude of variation is of the same order of magnitude as the change induced by vegetation fluorescence, while it is much greater in O2-A band. We used MODTRAN 4 to correct measurements from these atmospheric effects and to retrieve ground level band depths. It is found that the variation of corrected band depth with altitude is greatly reduced. These results show that MODTRAN 4 can be used to account for atmospheric effects. We also showed that an accurate evaluation of the contribution of environment is needed to correct band depth from atmospheric effects, especially in the O2-B band.
AB - Under sun-light illumination, the shape of the atmospheric oxygen bands (O2-B, 687 nm and O2-A, 760 nm) of the vegetation radiance is modified by chlorophyll fluorescence. However for far-range measurements, atmospheric effects also modify this shape. In this study, measurements in O2-A and O2-B absorption bands have been performed at different altitudes up to 3123 m over bare soil and wheat fields. It is observed that bands depth increase significantly with altitude. In O2-B band, the total magnitude of variation is of the same order of magnitude as the change induced by vegetation fluorescence, while it is much greater in O2-A band. We used MODTRAN 4 to correct measurements from these atmospheric effects and to retrieve ground level band depths. It is found that the variation of corrected band depth with altitude is greatly reduced. These results show that MODTRAN 4 can be used to account for atmospheric effects. We also showed that an accurate evaluation of the contribution of environment is needed to correct band depth from atmospheric effects, especially in the O2-B band.
KW - Atmospheric correction
KW - oxygen absorption band
KW - passive measurements
KW - sun-induced fluorescence
UR - https://www.scopus.com/pages/publications/85038563373
U2 - 10.1109/WHISPERS.2014.8077642
DO - 10.1109/WHISPERS.2014.8077642
M3 - Conference contribution
AN - SCOPUS:85038563373
T3 - Workshop on Hyperspectral Image and Signal Processing, Evolution in Remote Sensing
BT - 2014 6th Workshop on Hyperspectral Image and Signal Processing
PB - IEEE Computer Society
T2 - 6th Workshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing, WHISPERS 2014
Y2 - 24 June 2014 through 27 June 2014
ER -