eVIIRS Global NDWI

The EROS Visible Infrared Imaging Radiometer Suite (eVIIRS) Global Normalized Difference Water Index (NDWI) collection are based on the Visible Infrared Imaging Radiometer Suite (VIIRS) data acquired by the Joint Polar Satellite System (JPSS), a collaborative program between the National Oceanic and Atmospheric Administration (NOAA) and National Aeronautics and Space Administration (NASA). The VIIRS sensor is currently flying on the Suomi NPP satellite mission. The NOAA-20 satellite is a planned sensor on follow-on. The eVIIRS collection was developed as a follow-on mission to replace the eMODIS collection when the MODIS mission ends. The eVIIRS Global NDWI are 10-day composited data sets using the VIIRS sensor. Expedited (near real-time) production runs every ten days for these 10-day products. Because each of the composites are created from a varying number of images, these eVIIRS composites include acquisition files to identify which of the possible inputs were used to populate the final composite. The metadata accompanying the data files summarize geographic bounds, projection parameters and product contact information. The data has Global coverage and is available in GeoTIFF format, Geographic projection, and 1-kilometer resolution.

本数据集为EROS可见红外成像辐射计套件（eVIIRS）全球归一化差异水体指数（NDWI）数据集，其基于美国国家海洋和大气管理局（NOAA）与美国国家航空航天局（NASA）合作项目联合极地卫星系统（JPSS）所获取的可见红外成像辐射计套件（VIIRS）数据制作而成。VIIRS传感器目前搭载于苏奥米NPP卫星任务中，NOAA-20卫星为后续计划搭载该传感器的任务平台。eVIIRS数据集是为替代MODIS任务终止后的eMODIS数据集而开发的后续项目。eVIIRS全球NDWI数据集为采用VIIRS传感器生成的10天合成数据集。该10天合成产品每10天开展一次加急（近实时）生产。由于每幅合成影像均由数量不等的原始影像生成，此类eVIIRS合成影像附带了用于识别最终合成产物所用输入影像的采集文件。数据文件附带的元数据汇总了地理范围、投影参数以及产品联系人信息。本数据集覆盖全球范围，采用地理投影的GeoTIFF格式存储，分辨率为1千米。