MODIS/Terra Snow Cover 8-Day L3 Global 500m SIN Grid, Version 61

This global Level-3 (L3) data set provides the maximum snow cover extent observed over an eight-day period within 10° x 10° MODIS sinusoidal grid tiles. Tiles are generated by compositing 500 m observations from the 'MODIS/Terra Snow Cover Daily L3 Global 500m Grid' data set (DOI:10.5067/MODIS/MOD10A1.061). A bit flag index is used to track the eight-day snow/no-snow chronology for each 500 m cell. The terms \"Version 61\" and \"Collection 6.1\" are used interchangeably in reference to this release of MODIS data.本全球三级（Level-3，L3）数据集提供了10°×10° 中分辨率成像光谱仪（MODIS）正弦投影网格瓦片内，8天观测周期内的最大积雪覆盖范围。该类瓦片通过合成源自「MODIS/Terra每日积雪L3全球500米网格」数据集（DOI:10.5067/MODIS/MOD10A1.061）的500米分辨率观测数据生成。本数据集采用比特标志索引，对每个500米像元的8天积雪/无积雪时间序列进行追踪记录。 针对本次发布的MODIS数据，「Version 61」与「Collection 6.1」两种表述可互换使用。