Vegetation Index and Phenology (VIP) Vegetation Indices Monthly Global 0.05Deg CMG

The NASA MEaSUREs Vegetation Index and Phenology (VIP) global datasets were created using surface reflectance data from the Advanced Very High Resolution Radiometer (AVHRR) N07, N09, N11, and N14 datasets (1981 - 1999) and Moderate Resolution Imaging Spectroradiometer (MODIS) surface reflectance data (2000 - 2014). The VIP Vegetation Index (VI) product was developed to provide consistent measurements of the Normalized Difference Vegetation Index (NDVI) and modified Enhanced Vegetation Index (EVI2) spanning more than 30 years of data from multiple sensors. The EVI2 is a backward extension of AVHRR. Vegetation indices such as NDVI and EVI2 are useful for assessing the biophysical properties of the land surface, and are used to characterize vegetation phenology. Phenology tracks the seasonal life cycle of vegetation, and provides information on the biotic response to environmental changes. Information on each individual VIP product are available at: https://lpdaac.usgs.gov/dataset_discovery/measures/measures_products_table.美国国家航空航天局（NASA）气候测量与模型验证计划（MEaSUREs）植被指数与物候（VIP）全球数据集，基于1981年至1999年先进甚高分辨率辐射计（Advanced Very High Resolution Radiometer, AVHRR）N07、N09、N11及N14卫星数据集的地表反射率数据，以及2000年至2014年中分辨率成像光谱仪（Moderate Resolution Imaging Spectroradiometer, MODIS）地表反射率数据构建而成。VIP植被指数（VI）产品旨在提供覆盖多传感器、时长超30年的归一化差分植被指数（Normalized Difference Vegetation Index, NDVI）与修正型增强植被指数（modified Enhanced Vegetation Index, EVI2）的一致性观测数据。EVI2是针对AVHRR数据的向后延拓产物。诸如NDVI与EVI2的植被指数可用于评估陆地表面的生物物理特性，同时可用于表征植被物候特征。物候学追踪植被的季节性生命周期，可为探究生物对环境变化的响应提供信息支撑。各单款VIP产品的详细信息可访问：https://lpdaac.usgs.gov/dataset_discovery/measures/measures_products_table。