Global retrieval of harmonized microwave land surface emissivity leveraging multi-sensor measurements from GMI, AMSR2 and MWRIs

This repository holds the monthly records of global clear-sky land emissivity retrieved using combined observations from five passive microwave sensors operating in GPM era, namely, `GPM-CO/GMI`, `Fengyun-3B/MWRI`, `Fengyun-3C/MWRI`, `Fengyun-3D/MWRI`, and `GCOM-W1/AMSR2`. The project uses cloud mask data six geostationary visible and infrared imagers onboard three geostationary platforms, i.e. `GOES-16/ABI`, `Himawari-8, -9/AHI`, and `MSG-1, -2, 3/SEVIRI`. Sophisticated intercalibrations were applied to scale all emissivity subsets to be aligned with the GMI retrievals. The data were aggregated into `0.25` degree global equal lat-lon grids, spaning 2014 - 2023. Data description The data is stored in HDF5 scientific data format. For all sensors except for GMI, data are averaged seperately for ascending and descending orbits, filename follows the regulations: `Xcal_Emissivity_{Sensor}_{Orbit}_CMG5KM_{YYYYMM}.HDF5` Here, placeholders are specified with: Sensor: `AMSR2`, `FY3B`, `FY3C`, `FY3D`. Orbit: `A` for ascending orbit, `D` for descending orbit. YYYYMM: date like '202008'. For instance: 'Xcal_Emissivity_AMSR2_A_CMG5KM_201407.HDF5' For GMI, files are named like 'GMI_Emissivity_CMG5KM_202008.HDF5'. Meta The HDF5 data meta are listed as follows: netcdf file:Xcal_Emissivity_FY3B_A_MWRI_CMG5KM_201401.HDF5 { variables: short emissivity(9, 720, 1440); :_FillValue = -9999; // int :desc = "Monthly mean emissivity, all samples"; :scale_factor = 1.0E-4f; // float :Channel = "10v,10h,19v,19h,23v,37v,37h,89v,89h"; short emissivity_snowfree(9, 720, 1440); :Channel = "10v,10h,19v,19h,23v,37v,37h,89v,89h"; :_FillValue = -9999; // int :desc = "Snow-free (snowc<10%) emissivity"; :scale_factor = 1.0E-4f; // float float latitude(720); :units = "degree_north"; float longitude(1440); :units = "degree_east"; short std(9, 720, 1440); :_FillValue = -9999; // int :scale_factor = 1.0E-4f; // float :Channel = "10v,10h,19v,19h,23v,37v,37h,89v,89h"; } Cite the data: Hu, Jiheng, Rui Li, Peng Zhang, Yu Wang, Shengli Wu, Husi Letu, and Fuzhong Weng. 2026. “Global Retrieval of Harmonized Microwave Land Surface Emissivity Leveraging Multi-Sensor Measurements from GMI, AMSR2 and MWRIs.” Remote Sensing of Environment 334 (115169): 115169.