MODIS/Terra Snow Cover Daily L3 Global 500m SIN Grid, Version 4

MODIS/Terra Snow Cover Daily L3 Global 500m Grid (MOD10A1) contains snow cover and quality assurance (QA) data in HDF-EOS format along with corresponding metadata. Data files after 14 September 2003 include a snow albedo array with a beta status. MOD10A1 consists of 1200 km by 1200 km tiles of 500 m resolution data gridded in a sinusoidal map projection. MODIS/Terra V004 data extend from 24 February 2000 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/Terra每日积雪L3级全球500米网格数据集（MOD10A1）包含HDF-EOS格式的积雪覆盖数据与质量保证（QA）数据，以及配套元数据。2003年9月14日之后生成的数据文件包含带有β测试版状态的积雪反照率数组。MOD10A1数据集由分辨率为500米、采用正弦地图投影网格化的1200千米×1200千米分幅数据组成。MODIS/Terra V004版本数据的时间跨度为2000年2月24日至今。MODIS积雪数据基于采用归一化积雪指数（NDSI）及其他判据测试的积雪制图算法。V004版本仅开放黄金月数据集，该数据集为V004版本的样本数据，时间跨度为2002年8月29日（年积日241）至2002年10月7日（年积日280）。该黄金月数据集仅可通过联系NSIDC用户服务中心提出特殊申请获取。请注意，NSIDC现已提供完整的V005版本数据序列，该版本为当前可用的最高版本，具备最优的数据质量。