GCOM-C/SGLI L1B Visible and Near Infrared (Polarization) (1km)

GCOM-C/SGLI L1B Visible and Near Infrared (Polarization) (1km) dataset is obtained from the SGLI sensor onboard GCOM-C and produced by the Japan Aerospace Exploration Agency (JAXA). GCOM-C is Sun-synchronous sub-recurrent Orbit satellite launched on December 23, 2017, which mounts SGLI and conducts long-term global observations of geophysical variables related to the global climate system across 28 items including aerosol and vegetation over 4 areas of atmosphere, land, ocean, and cryosphere. The data will be used to contribute to higher accuracy of global warming prediction. The SGLI has swath of 1150 km in the visible band and 1400 km in the infrared band. GCOM-C/SGLI Level 1B products are using the data contained in Level 1A products as inputs, and the following processes are applied on the input data, calculation of spectral radiance, re-sampling of geometric correction, data and observation data to L1B, Reference Coordinate System, calculation of land/water flag, creation of quality information. This product is top of atmosphere radiance SI (Scaled Integer) data, using the Level 1A product as input. The provided format is HDF5. The spatial resolution is 1km. Radiometric correction is stored. The geometries are projected to L1B reference coordinates commonly for VNR-NP and IRS, and the ground observation position in each band are same. Therefore, as geometric information, latitude, longitude, solar azimuth angle and solar zenith angle of 10 pixels interval are stored commonly for band. On the other hand, since the precise satellite position in observed pixels is varied depending on band, the satellite azimuth angle and the satellite zenith angle are stored by 10 pixels interval for each band. The stored geometric information is the center position of the pixel. In addition, The current version of the product is Version 2. QA flag corresponding to the observation image is appended to Level1B product.

GCOM-C/SGLI L1B 可见光与近红外（偏振）（1km）数据集，由搭载于GCOM-C卫星的SGLI传感器获取，由日本宇宙航空研究开发机构（Japan Aerospace Exploration Agency，JAXA）生成。GCOM-C是一颗于2017年12月23日发射的太阳同步回归轨道卫星，搭载SGLI传感器，针对全球气候系统相关的地球物理变量开展长期全球观测，观测范畴涵盖大气、陆地、海洋、冰冻圈四大领域，涉及气溶胶、植被等28项观测要素。该数据集可用于提升全球变暖预测的精度。SGLI传感器的可见光波段幅宽为1150千米，红外波段幅宽为1400千米。GCOM-C/SGLI L1B级产品以L1A级产品包含的数据作为输入数据源，并对输入数据执行以下处理流程：光谱辐射亮度计算、几何校正重采样、输入数据与观测数据的L1B格式转换、参考坐标系建立、陆水标识计算以及质量控制信息生成。本产品为大气层顶辐射亮度SI（Scaled Integer）数据，以L1A级产品作为输入。数据集提供格式为HDF5，空间分辨率为1千米，包含辐射校正信息。几何数据均投影至适用于VNR-NP与IRS的L1B参考坐标系，且各波段的地面观测位置保持一致。因此，纬度、经度、太阳方位角与太阳天顶角以每10个像元为间隔存储，作为各波段通用的几何信息。另一方面，由于观测像元的精确卫星位置随波段不同而存在差异，卫星方位角与卫星天顶角以每10个像元为间隔，按各波段分别存储。所存储的几何信息为像元的中心位置。此外，本产品当前版本为Version 2，与观测影像对应的质量标识（QA flag）已附加至L1B级产品中。