MODIS/TERRA MOD13A2 Vegetation Indices 16-Day L3 Global 1km Version 6

The MODIS Vegetation Indices Version 6 product provides a Vegetation Index (VI) value at a per pixel basis. There are 2 primary vegetation layers. The algorithm for this product chooses the best available pixel value from all the acquisitions from the 16 day period. The criteria used is low clouds, low view angle and the highest NDVI/EVI value. The first is the Normalized Difference Vegetation Index (NDVI), which is referred to as the continuity index to the existing National Oceanic and Atmospheric Administration-Advanced Very High Resolution Radiometer (NOAA-AVHRR) derived NDVI. The second vegetation layer is the Enhanced Vegetation Index (EVI), which has improved sensitivity over high biomass regions. Information on each individual MODIS Vegetation Indices Product along with improvements/changes for Version 6 are available at: https://lpdaac.usgs.gov/dataset_discovery/modis_products_table.

中分辨率成像光谱仪（MODIS）植被指数第6版产品可提供逐像素的植被指数（VI）数值。该产品包含两类核心植被图层，其算法会从16天周期内的所有观测数据中选取最优像素值，选取标准为低云量、低观测角以及最高的归一化差分植被指数（NDVI）/增强型植被指数（EVI）数值。第一类为归一化差分植被指数（NDVI），该指数可作为美国国家海洋和大气管理局-先进甚高分辨率辐射计（NOAA-AVHRR）所生成NDVI的延续性指标。第二类为增强型植被指数（EVI），其在高生物量区域具备更优的灵敏度。关于各款MODIS植被指数产品及第6版产品的改进与变更详情，可访问以下网址获取：https://lpdaac.usgs.gov/dataset_discovery/modis_products_table。