Scanning Multichannel Microwave Radiometer (SMMR) and Special Sensor Microwave/Imager (SSM/I) data have been used to produce a SWE data set gridded onto a Lambert-Azimuthal Equal Area grid with 25 km grid resolution. The SWE data available here have been computed using re-processed brightness temperature observations that have been corrected in advance for inter-sensor differences. The data set includes monthly values of SWE and its standard deviation, together with the number of days (within a month) with snow cover in the respective grid cell.
The documentation informs about the used approach, the methods used to optimize the data set including the error estimation, and a few aspects about the validation.
We note that some regions are subject to large discrepancies between the observed and the retrieved SWE values. Reasons for this are given below in sections "data quality" and "references".
The maps on top of this page exemplify the SWE distribution in the Northern Hemisphere for the months 11/2006 to 04/2007.