Community Satellite Processing Package

University of Wisconsin-Madison CrIS, AIRS and IASI Hyperspectral Retrieval Software (HSRTV) Version 3.0 Release

6 July 2026

Update to the infrared sounder software for retrieving atmospheric, surface and cloud parameters including profiles of temperature and moisture from these hyperspectral infrared sounders at single Field-Of-View (FOV) resolution:
  • NOAA-21 and NOAA-20 Cross-track Infrared Sounder (CrIS),
  • Aqua Atmospheric InfraRed Sounder (AIRS), and
  • Metop-C and Metop-B Infrared Atmospheric Sounding Interferometer (IASI).
What is new in Version 3.0:
  • Added support for NOAA-21 CrIS retrievals.
  • Newly calculated regression retrieval coefficients are made available for each of the instruments.
  • AIRS uses a good channel set of 1246 channels.
  • New executables have been compiled to reflect these changes.
The dual-regression infrared sounder retrieval algorithm is developed at the University of Wisconsin-Madison Space Science and Engineering Center by Elisabeth Weisz and William Smith, Sr., for use with ultraspectral infrared instruments. The software uses native format direct broadcast or archived input files and produces HDF5 output files containing these arrays at single Field-Of-View (FOV) resolution:
  • Atmospheric temperature [K] at 101 pressure levels
  • Atmospheric moisture [g/kg] at 101 pressure levels
  • Atmospheric ozone [ppmv] at 101 pressure levels
  • Atmospheric relative humidity [%] at 101 pressure levels
  • Atmospheric dew point temperature [K] at 101 pressure levels
  • Surface skin temperature [K]
  • Surface emissivity at instrument spectral resolution [cm-1] (under clear conditions only)
  • Total precipitable water (vertically integrated from 100 hPa to surface) [cm]
  • Precipitable water 1 (vertically integrated from 900 hPa to surface) [cm]
  • Precipitable water 2 (vertically integrated from 700 to 900 hPa) [cm]
  • Precipitable water 3 (vertically integrated from 300 to 700 hPa) [cm]
  • Total ozone amount (vertically integrated) [dobson units]
  • Lifted index [Degrees Celsius]
  • Convective available potential energy [J/kg]
  • CO2 amount [ppmv]
  • Cloud top pressure [hPa]
  • Cloud top temperature [K]
  • Cloud optical thickness
  • Effective cloud emissivity
  • Cloud mask (values: 0 clear, 1 cloud)
The HSRTV Version 3.0 software can be executed on the following input data:
  • 1) Atmospheric InfraRed Sounder (AIRS) on Aqua
    • Direct Broadcast or Archived Level 1B data sets.
    • Example filename:

    • AIRS.2026.05.29.108.L1B.AIRS_Rad.v5.0.22.100.D26149112751.hdf

  • 2) Infrared Atmospheric Sounding Interferometer (IASI) on Metop-C and Metop-B
    • Level 1C AAPP EUMETSAT Format.
    • Example filenames:

    • IASI_xxx_1C_M03_20260603135622Z_20260603140910Z_V_T_20260603141125Z
    • IASI_xxx_1C_M01_20260603150208Z_20260603151440Z_V_T_20260603151529Z

  • 3) Cross-track Infrared Sounder (CrIS) onboard NOAA-21 and NOAA-20 Full Spectral Resolution (FSR)
    • Direct Broadcast or Archived Sensor Data Records (SDRs). Please note: Both Radiance and Geolocation files are required as input.
    • Example filenames:

    • SCRIF_j02_d20260529_t1851449_e1852147_b18394_c20260529192252329395_cspp_dev.h5
    • GCRSO_j02_d20260529_t1851449_e1852147_b18394_c20260529192252370946_cspp_dev.h5

CSPP HSRTV Version 3.0 System Requirements
  • Intel or AMD CPU with 64-bit instruction support,
  • 8 GB RAM,
  • Rocky Linux 8.10; the software has also been tested on Rocky Linux 9,
  • 7 GB of disk space (plus space for your own DB data and HSRTV products).
The release package provides download and installation instructions, along with documentation and references for the algorithm.

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