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Generation of high-resolution East Antarctic landfast sea-ice maps from cloud-free MODIS satellite composite imagery
journal contribution
posted on 2023-05-17, 04:58 authored by Alexander FraserAlexander Fraser, Robert MassomRobert Massom, Michael, KJA method to generate high spatio-temporal resolution maps of landfast sea ice from cloud-free MODIS composite imagery is presented. Visible (summertime) and thermal infrared (wintertime) cloud-free 20-day MODIS composite images are used as the basis for these maps, augmented by AMSR-E ASI sea-ice concentration composite images (when MODIS composite image quality is insufficient). The success of this technique is dependent upon efficient cloud removal during the compositing process. Example wintertime maximum (~374,000 km2) and summertime minimum (~112,000 km2) fast-ice maps for the entire East Antarctic coast are presented. The summertime minimum map provides the first high-resolution indication of multi-year fast-ice extent, which may be used to help assess changes in Antarctic sea-ice volume. The 2σ errors in fast-ice extent are estimated to be ±2.98% when ≥90% of the fast-ice pixels in a 20-day period are classified using the MODIS composite, or ±8.76 otherwise (when augmenting AMSR-E or the previous/next MODIS composite image is used to classify N10% of the fast ice). Imperfect composite image quality, caused by persistent cloud, inaccurate cloud masking or a highly dynamic fast-ice edge, was the biggest impediment to automating the fast-ice detection procedure.
History
Publication title
Remote Sensing of EnvironmentVolume
114Issue
12Pagination
2888-2896ISSN
0034-4257Department/School
School of Natural SciencesPublisher
Elsevier Science Inc.Place of publication
NY, USARights statement
The definitive version is available at http://www.sciencedirect.comRepository Status
- Restricted