Evaluation of a sea ice algorithm for SAR data from the Bay of Bothnia
Conference contribution, 2010
A sea ice drift algorithm published by M. Thomas et. al.
(2008) has been implemented and evaluated. Input to
the algorithm is Synthetic Aperture Radar (SAR)
images, which are processed using phase correlation in
a multi-resolution processing system. The algorithm has
been tested with horizontally co-polarized (HH)
ENVISAT ASAR Wide Swath images and
RADARSAT-2 ScanSAR images. The possible benefits
of using cross-polarized (HV) RADARSAT-2 ScanSAR
data are investigated, and initial testing of the algorithm
for L-band SAR data from ALOS PALSAR has been
The validity of the produced motion fields has been
tested in three different ways. Most of the SAR images
in this analysis were acquired over the Bay of Bothnia.
Five meteorological stations located in this region have
been collecting wind data with a temporal resolution of
three hours. It is confirmed that the wind data correlates
with the derived sea ice motion. Another source of
validation data that has been used is the daily ice charts
published by the Swedish Meteorological and
Hydrological Institute (SMHI). The third method used
for validation is straightforward, visual tracking of sea
The algorithm is facing some difficulties when it comes
to ice tracking close to the shoreline, in archipelagoes
etc, since the motionless solution will be favoured. It
can however be suppressed by filtering areas of land.
This addition gives a more robust algorithm.
Bay of Bothnia
radar remote sensing