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Data release note : GLI Snow / Sea Ice Covered Area products

Algorithm development PI : Stevens Institute of Technology / Knut Stamnes
Product validation PI : Meteorological Research Institute / Teruo Aoki
Product validation in EORC : Masahiro Hori
Snow / Sea Ice Covered Area products (Ver.1) were released to the public on December 24, 2004.Current status of product validation and future plans are described below together with known problems of the current version.

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Current accuracy of the Ver.1 products (30%) are estimated based upon the results of ground observation at Barrow, Alaska in April, 2003 and also upon hemispherical analysis of GLI snow products around the Northern Polar Region which are compared with SSM/I snow products. The accuracy of this product is still preliminary and will be re-evaluated in coming version-up processes  of the GLI snow algorithms (Ver.2 in June-July 2004 and later versions). Known problems or concerns decreasing the Ver.1 products' accuracy are the following;
  • High altitude snow covered area (e.g. Ice sheet, mountainous region) tends to be identified as clouds.
  • Sea ice area estimated tends to be slightly smaller than those of microwave sensor (SSM/I).
  • Only daytime observation data are processed and evaluated for Level-2 global snow products.
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| GLI Cryosphere Validation |