Daytime and Nighttime Polar Cloud and Snow Identification Using MODIS Data Qing Trepte SAIC, Hampton, VA USA Patrick Minnis Atmospheric Sciences, NASA Langley Research Center, Hampton, VA USA Robert F. Arduini SAIC, Hampton, VA USA Extended Abstract for SPIE 3 rd International Asia-Pacific Environmental Remote Sensing Symposium 2002: Remote Sensing of the Atmosphere, Ocean, Environment, and Space Hangzhou, China October 23-27, 2002