NSCAT Twice-Daily SIR-Enhanced EASE-Grid 2.0 Radar Backscatter, Version 1

This data set provides twice-daily enhanced-resolution radar backscatter images from 14 GHz NASA Scatterometer (NSCAT) observations by applying the Scatterometer Image Reconstruction with Filtering (SIRF) algorithm. The algorithm incorporates a median filter and a simplified spatial response function. Multiple passes of the spacecraft are combined to produce a higher spatial resolution and fill in coverage gaps between the individual measurement footprints, which are not contiguous and have six-sided shapes. Overlapping imaging periods start each day and extend through 4- and 8-day periods. Data are gridded to Northern Hemisphere, Southern Hemisphere, and Temperate EASE-Grid 2.0 projections at 3.125 km and 25 km resolutions.

本数据集通过应用滤波散射计图像重建（Scatterometer Image Reconstruction with Filtering, SIRF）算法，对14 GHz波段的美国国家航空航天局散射计（NASA Scatterometer, NSCAT）观测数据进行处理，生成每日两次的增强分辨率雷达后向散射图像。该算法集成了中值滤波器与简化空间响应函数。研究人员将航天器的多次过境数据进行融合，以提升空间分辨率，并填补单个测量足迹之间的覆盖空白——此类足迹并非连续分布，且呈六边形形态。重叠成像时段每日启动，覆盖时长涵盖4日与8日周期。数据被网格化至北半球、南半球以及温带EASE-Grid 2.0投影坐标系，分辨率分别为3.125 km与25 km。