Dear Zhu,
I am sorry this work has been stalled for so long. It looks like it requires some care. I will be off for almost two weeks, so I am afraid I can't give you much help and guidance before that. I have passed on your question to two of my colleagues that I know have done SNO finding fairly recently and hope they might be able to help.
-Adam
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-- Adam Dybbroe, Satellite Remote Sensing Scientist Research lead - Nowcasting and Remote Sensing Meteorological Research unit, Research and Development Swedish Meteorological and Hydrological Institute (SMHI) www.pytroll.org nwcsaf.smhi.se www.smhi.se