Abstract:
Sea ice products from the Moderate Resolution Imaging
Spectroradiometer (MODIS) include level 2 swath data and level 3
gridded day and night composites, at 1 km resolution. Level 3 products
consist of tiles of data, approximately 1200 km by 1200 km in area,
gridded in a Lambert Azimuthal Equal-Area (EASE-Grid) projection. The
sea ice algorithm uses a Normalized Difference Sea Ice Index (NDSI)
and
... other criteria to distinguish sea ice from open ocean, based on
reflective characteristics.
The level 2 swath product (MOD291) contains the following fields: Sea
Ice by Reflective Characteristics, Sea Ice by Reflective Pixel Quality
Assurance (QA), Ice Surface Temperature (IST), IST Pixel QA, Sea Ice
by IST, Combined Sea Ice, Latitude, and Longitude. The data also
contain local and global metadata. Latitude and longitude geolocation
fields are at 5 km resolution, while all other fields are at 1 km
resolution. Sea ice data are in HDF-EOS format and are available by
ftp. MODIS sea ice products are considered provisional at this
time. Product quality may not be optimal, and incremental product
improvements are still occurring.