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This image was derived from the Day CMG Snow Cover field of the MODIS/Terra Snow Cover Daily L3 Global 0.05Deg CMG, Version 4 data set, available from NSIDC. MOD10A1 500 m pixels that lie within a 0.05 degree resolution Climate Modeling Grid (CMG) pixel are binned to determine surface features. Data are gridded in a geographic projection. Snow percentage in each cell of the Day CMG Snow Cover field is calculated using 500 m totals of the number of snow observations and count of land observations in that cell for the day. The percentage of snow-covered land is based on the clear-sky view of land in the CMG cell. So the amount of snow observed in a CMG cell is based on the cloud-free observations mapped into the CMG grid cell for all land in that cell.
The following file is the source file used to create this image:
MOD10C1.A2003093.004.2003096154224.hdf
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