ISLSCP II FASIR-adjusted NDVI, 1982-1998

The Fourier-Adjusted, Sensor and Solar zenith angle corrected, Interpolated, Reconstructed (FASIR) adjusted Normalized Difference Vegetation Index (NDVI) data sets were generated to provide a 17-year, satellite record of monthly changes in the photosynthetic activity of terrestrial vegetation. FASIR-NDVI data are also used in climate models and biogeochemical models to calculate photosynthesis, the exchange of CO2 between the atmosphere and the land surface, land-surface evapotranspiration and the absorption and release of energy by the land surface. There are three data files provided at spatial resolutions of 0.25, 0.5 and 1.0 degree in latitude and longitude. FASIR adjustments concentrated on reducing NDVI variations arising from atmospheric, calibration, view and illumination geometries and other effects not related to actual vegetation change.

FASIR NDVI was also generated to provide inputs for computing a 17-year time series of associated biophysical parameters, provided as a separate data set in this data collection. The production of the FASIR NDVI data set and its associated biophysical parameters was funded by NASA's Land Surface Hydrology program and the Higher Education Funding Council for Wales (HEFCW) as a core component of the International Satellite Land Surface Climatology Project (ISLSCP) Initiative II Data Collection.

四阶修正、传感器及太阳天顶角校正、插值及重构的标准化植被指数（NDVI）数据集（FASIR-NDVI）得以生成，旨在提供陆地植被光合作用月度变化的17年卫星记录。FASIR-NDVI数据亦广泛应用于气候模型和生物地球化学模型中，用以计算光合作用、大气与地表间的二氧化碳交换、地表蒸发蒸腾以及地表能量的吸收与释放。本数据集提供三种空间分辨率为0.25、0.5和1.0度经纬度的数据文件。FASIR修正主要集中于降低由大气、校准、视角与照明几何形状等因素引起的NDVI变化，以及与实际植被变化无关的其他效应。此外，为计算相关的生物物理参数17年时间序列，FASIR NDVI亦被生成，并作为本数据集的一个独立数据集提供。FASIR NDVI数据集及其相关生物物理参数的生产，由美国国家航空航天局（NASA）陆地水文计划以及威尔士高等教育基金委员会（HEFCW）资助，作为国际卫星陆地气候学计划（ISLSCP）第二阶段数据收集的核心组成部分。