ASIS Input data

The satellite data used in ASIS calculations is derived from the METOP-AVHRR sensor at 1 km resolution, starting from 2007. Additionally, data at 1 km resolution for the period 1984-2006 is sourced from the NOAA-AVHRR dataset at 16 km resolution. These datasets are crucial for the computation of mean Vegetation Health Index (VHI) and Agricultural Stress Index (ASI). The crop/grass mask utilized in ASIS is based on FAO GLC-SHARE, where pixels with at least 5% coverage by the class are defined as cropland/grassland. Data Source NDVI METOP NOAA-AVHRR Precipitation ECMWF RFE Boundary maps GAUL 2014 (DISCLAIMERS) More information on GAUL Crop mask Global Land Cover - SHARE (GLC-SHARE)用于ASIS计算的卫星数据源自分辨率为1千米的METOP-AVHRR传感器，数据采集时段始于2007年。此外，1984年至2006年时段的1千米分辨率数据，则取自分辨率为16千米的NOAA-AVHRR数据集。上述数据集对于平均植被健康指数（Vegetation Health Index, VHI）与农业胁迫指数（Agricultural Stress Index, ASI）的计算至关重要。ASIS中使用的作物/草地掩膜基于联合国粮食及农业组织（Food and Agriculture Organization, FAO）的GLC-SHARE数据集，其中该类别覆盖占比不低于5%的像素被划定为农田/草地。数据源详情如下：归一化植被指数（Normalized Difference Vegetation Index, NDVI）数据取自METOP、NOAA-AVHRR；降水数据取自欧洲中期天气预报中心（European Centre for Medium-Range Weather Forecasts, ECMWF）与RFE；边界地图采用全球行政单元图层（Global Administrative Unit Layers, GAUL）2014版本（免责声明详见GAUL相关资料）；作物掩膜采用全球土地覆盖共享数据集（Global Land Cover - SHARE, GLC-SHARE）。