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Fractional Snow Cover Extent for Northern Hemisphere from Optical Data (FMI & SYKE)

Product Code & Name
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 provides the fractional snow cover (FSC) in percentage (%) per grid cell for all satellite overpasses of a given day. 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
  • SEN3APP Snow Extent Data HTTP Access
  • Validation Status
    The VIIRS based product has not been validated, but the algorithm behind it (applied to nearly corresponding sensors) has undergone extensive validation. We refer here to the description of GlobSnow SE product (Metsämäki et al., 2015) where some validation is presented and to the actual the validation report from GlobSnow product (available on request from Kari Luojus, FMI).
    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.
    Bippus, G., Nagler, T., Ripper, E., Hüsler, F., Wunderle, S., Metsämäki, S., Böttcher, K., Foppa, N., Fontana, F., Schöner, W., Unger, R., Malnes, E., Hindberg, H., Solberg, R., Due Trier, O., Luojus, K., Hiltunen, M., Pulliainen, J. and Pinnock, S. (2014): Full Snow Extent Validation and Intercomparison Report. ESA DUE GlobSnow-2, Del. 21. Publication in preparation.
    User Guide
    The description of the NH FSC product is in preparation. The description to the legacy FSC product, which is applicable for most parts 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.
    Additional information regarding the algorithm can also be found in the User Guide.
    Spatial Coverage & Resolution
    Northern Hemisphere 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
    FMI and SYKE
    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.
    Available via http, wms and wcs.