W. Aldenhoff, L.E.B. Eriksson, Y. Ye and C. Heuzé (2020), First-year and Multiyear Sea Ice Incidence Angle Normalization of Dual-polarized Sentinel-1 SAR Images in the Beaufort Sea, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing. vol 13, pp 1540-1550, doi: 10.1109/JSTARS.2020.2977506
Obs: W. Aldenhoff was then a PhD student under my supervision (graduated 2020).
Last paper of Wiebke’s PhD to be published (see also ,  and ), although this work was among the first executed. The reason? It is common practice to normalise the backscatter by the incidence angle, but we wondered:
- does this normalisation really improve on the results?
- and what is the best way to perform the normalisation?
Using some rare near-coincidental ascending and descending images from Sentinel-1, we could retrieve the slopes backscatter / incidence angle for sea ice, for HH and HV. And the short answer is: yes, normalisation does make a big difference for automatic ice classification and for mosaicing. This is especially true for multi year ice, whose backscatter depends on its age.
One issue remains: first year ice backscatter still is too close to the noise level, to the point that the first subswath cannot be used.