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Extended Baltic Sea Drainage Basin Direct Broadcast FSC Based on NPP VIIRS/Sentinel-3 SLSTR (SYKE & FMI)

Product Code & Name
FSC-Fractional Snow Cover Extent
Contact
Dr. Kari Luojus, Finnish Meteorological Institute
Email: kari.luojus () fmi.fi
Dr. Sari Metsämäki, Finnish Environment Institute
Email: sari.metsamaki () ymparisto.fi
Overview
The Daily Fractional Snow Cover (DFSC) product for extended Baltic region provides the fractional snow cover (FSC) in percentage (%) per grid cell for all satellite overpasses of a given day (for the Pan-European domain). The product represents the best estimate of today’s snow cover. If there are multiple snow observations (only far north within a day), the satellite observations applied are those giving best solar illumination (highest solar elevation). The product is generated for each day based on a 24 hours’ time window limited by sunlight. The product is produced and made available for each day in near real time.
Data Portals
  • FMIARC GeoPortal
  • Validation Status
    The VIIRS-based product, being rather new, has not been extensively validated, but the algorithm behind it (applied to the nearly corresponding sensors: Terra/MODIS and Envisat/AATSR) has been validated. The algorithms have been applied in Northern Hemisphere SE production in GlobSnow) and in European-scale SE production in CryoLand-project (Solberg et al., 2013). The validation results reported in these projects are valid and representative so far, until VIIRS (or preferably S-3) based validation is carried out. The existing validations relevant to the Extended Baltic Sea Fractional Snow Cover Extent product are presented in:
    Solberg, R., Metsämäki, S., Malnes, E., Hindberg, H., Bippus, G., Nagler, T., Luojus, K., Ryyppö, T., Hiltunen, M., and Pulliainen, J. (2013): Implementation of Upgraded Snow Services - V1.0. EU FP7 CryoLand, Internal Deliverable ID4.6, 86 pp. Publication in preparation.
    Metsämäki, S., Mattila, O.-P., Pulliainen, J., Niemi, K., Luojus, K., Böttcher, K. (2012). An optical reflectance model-based method for fractional snow cover mapping applicable to continental scale. Remote Sensing of Environment, 123, 508-521.
    Metsämäki, S., Pulliainen, J., Salminen, M., Luojus, K., Wiesmann, A., Solberg, R., Böttcher, K., Hiltunen, M. and Ripper, E., "Introduction to GlobSnow Snow Extent products with considerations for accuracy assessment", Remote Sensing of Environment, Vol. 156, January 2015, pp. 96-108, doi: 10.1016/j.rse.2014.09.018.
    User Guide
    The description of the Extended Baltic Sea FSC product is in preparation. The description to the legacy FSC product, which is for most parts applicable, is available here:
    http://www.globsnow.info/se/GlobSnow2_SE_SWE_Product_User_Guide_v1_r1.pdf
    Algorithm Theoretical Basis Document
    The algorithm is described in:
    Metsämäki, S., Pulliainen, J., Salminen, M., Luojus, K., Wiesmann, A., Solberg, R., Böttcher, K., Hiltunen, M. and Ripper, E., "Introduction to GlobSnow Snow Extent products with considerations for accuracy assessment", Remote Sensing of Environment, Vol. 156, January 2015, pp. 96-108, doi: 10.1016/j.rse.2014.09.018.
    Metsämäki, S., Mattila, O.-P., Pulliainen, J., Niemi, K., Luojus, K., Böttcher, K. (2012). An optical reflectance model-based method for fractional snow cover mapping applicable to continental scale. Remote Sensing of Environment, 123, 508-521. Additional information regarding the algorithm can also be found in the User Guide.
    Spatial Coverage & Resolution
    Limited Pan-European domain
    Spatial resolution: 1000m, (in future 500m)
    Temporal Coverage & Resolution
    Daily product
    Weekly and Monthly aggregate products
    Platform(s)
    Suomi NPP
    Sensor(s)
    VIIRS
    Data Format (s)
    NetCDF, GeoTIFF
    Version
    V1.0
    Producers
    SYKE and FMI
    Data Policy
    Data are provided free of charge during the project period for non-commercial usage
    Access
    Products will be provided through the FMIARC geoportal. WMS, WCS