Landfast sea ice monitoring using multisensor fusion in the Antarctic
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- Landfast sea ice monitoring using multisensor fusion in the Antarctic
- Kim, Miae
- Physical Geography
- Landfast sea ice; Antarctic; Random forest; Decision trees; Remote Sensing
- Issue Date
- Kim, Miae, et al. 2015. "Landfast sea ice monitoring using multisensor fusion in the Antarctic". GIScience & Remote Sensing, 52: 239-256.
- Landfast sea ice (fast ice) means sea ice that is attached to the shoreline with little or no
motion in contrast to pack ice which drifts on the sea. As fast ice plays an important role
in the environmental and biological systems of the Antarctic, it is crucial to accurately
monitor the spatiotemporal distribution of fast ice. Previous studies on fast ice using
satellite remote sensing were mostly focused on the Arctic and near-Arctic areas,
whereas few studies were conducted over the Antarctic, especially the West Antarctic
region. This research mapped fast ice using multisensor data from 2003 to 2008 based
on machine learning approaches ？ decision trees (DTs) and random forest (RF). A total
of seven satellite-derived products, including Advanced Microwave Scanning
Radiometer for the Earth observing system brightness temperatures and sea ice concentration,
Moderate Resolution Imaging Spectroradiometer (MODIS) ice surface temperature
(IST) and Special Sensor Microwave/Imager ice velocity, were used as input
variables for identifying fast ice. RF resulted in better performance than that of DT for
fast ice classification. Visual comparison of the fast ice classification results with 250-m
MODIS images for selected areas also revealed that RF outperformed DT. Ice velocity
and IST were identified as the most contributing variables to classify fast ice.
Spatiotemporal variations of fast ice in the East and West Antarctic were also examined
using the time series of the fast ice maps produced by RF. The residence time of fast ice
was much shorter in the West Antarctic than in the East.
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