MODIS/Aqua Snow Cover 8-Day L3 Global 500m SIN Grid, Version 4

MODIS/Aqua Snow Cover 8-Day L3 Global 500m Grid (MYD10A2) contains data fields for maximum snow cover extent over an eight-day compositing period and a chronology of snow occurrence observations in HDF-EOS format, along with corresponding metadata. MYD10A2 consists of 1200 km by 1200 km tiles of 500 m resolution data gridded in a sinusoidal map projection. Data extend from 04 July 2002 to present. MODIS snow cover data are based on a snow mapping algorithm that employs a Normalized Difference Snow Index (NDSI) and other criteria tests. The only data available for Version 4 (V004) is the Golden Month, which is a sample of V004 data covering the time period 29 August 2002 (day of year 241) through 7 October 2002 (day of year 280). The Golden Month is only available by special request by contacting NSIDC User Services.

Please note that NSIDC now has a complete series of Version 5 data, which is the highest version number now available and represents the best quality of data.

MODIS/Aqua积雪覆盖8天合成L3级全球500米网格（MYD10A2）数据集包含HDF-EOS格式的8天合成周期内最大积雪覆盖范围数据字段、积雪发生观测时序数据，以及配套元数据。MYD10A2采用正弦地图投影进行网格化，由分辨率500米、尺寸为1200千米×1200千米的分幅瓦片组成。该数据集的时间覆盖范围为2002年7月4日至今。MODIS积雪覆盖数据基于采用归一化积雪指数（Normalized Difference Snow Index, NDSI）及其他判别准则的积雪制图算法。版本4（V004）仅提供“黄金月”数据集，该样本为覆盖2002年8月29日（年积日241）至2002年10月7日（年积日280）的V004数据，且需通过联系NSIDC用户服务中心特殊申请获取。请注意，NSIDC现已提供完整的版本5（V005）数据序列，这是当前可用的最高版本，代表了最优的数据质量。