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source
- NCEI/NOAA; Rutgers U.
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data type
- Interpreted/diagnosed from optical imagery
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spatial domain
- Northern Hemisphere
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spatial resolution
- 89 x 89 grid: cell size varies with latitude, from ∼10,700 km² near lat. 0° to ∼41,800 km² near lat. 90°N
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temporal coverage
- Record begins in 1966 (but more reliable from 1970)
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time step
- Weekly
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data format
- NetCDF
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comments
- Binary classification based on 50% threshold. Initially mapped by manual analysis: more automated system adopted from 1999. Data available as NetCDF (legacy ASCII data from rutgers website). Full details in Estilow et al. (2015)
https://essd.copernicus.org/articles/7/137/2015/essd-7-137-2015.pdf