GCOM-C/SGLI L1A Shortwave Infrared Thermal Infrared (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 1 km. 250 m is also available. 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 Level 1B product.