Radio Occultation Data from COSMIC Available in the IDD

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The Unidata Program Center is partnering with UCAR's COSMIC program to provide radio occultation data provided by Spire Global. The products described below are now available via the Internet Data Distribution (IDD) network. Data are on the EXP feed with a typical total volume of 80-110 MB per hour.

From the COSMIC announcement of the availability of these products:

The NOAA Commercial Data Program Delivery Order 5 (DO5) implements unrestricted data rights for the radio occultation data processed by UCAR COSMIC’s CDAAC in near real time, with the goal of making data products available to a wider audience. For DO5 Spire Global provides observation data from its satellite constellation for processing into higher level neutral atmosphere (about 3300 profiles/day) and ionosphere products. The DO5 data are made available on a next day basis at CDAAC and will now additionally be distributed via Unidata’s Internet Data Distribution (IDD) service in near-real time.

The products covered by DO5 being made available via the IDD are listed below, along with examples of the Product IDs, REQUEST lines and PQACT entries you would use to configure your Local Data Manager (LDM) to receive the products. (In the REQUEST line examples, replace upstream_IDD_relay with the host name of your site's upstream LDM.)

Atmospheric profile without moisture information (atmPrf)

Full resolution profiles of physical parameters including bending angle, refractivity, dry pressure, dry temperature, impact parameter, etc. versus geometric height above mean sea level. Reference: https://cdaac-www.cosmic.ucar.edu/cdaac/cgi_bin/fileFormats.cgi?type=atmPrf.

Example LDM/IDD Product ID:
spireert/level2/atmPrf/2023.031/atmPrf_S115.2023.031.17.59.G07_0001.0001_nc
Example LDM Configuration file REQUEST line:
REQUEST EXP “spireert/level2/atmPrf” upstream_IDD_relay
Example LDM pattern-action file action:
EXP spireert/level2/atmPrf/([0-9]{4}).([0-9]{3})/(atmPrf_.*_nc)
    FILE    -close    -overwrite  
    /data/ldm/pub/native/COSMIC/spireert/atmPfr/\3

Atmospheric occultation profile with moisture information included (wetPf2)

Atmospheric occultation profile with moisture information included. A gridded analysis or short-term forecast is used to separate the pressure, temperature and moisture contributions to refractivity. This file is interpolated to 100 meter height levels. References: https://cdaac-www.cosmic.ucar.edu/cdaac/cgi_bin/fileFormats.cgi?type=wetPf2 and https://doi.org/10.3390/rs14215614.

Example LDM/IDD Product ID:
spireert/level2/wetPf2/2023.031/wetPf2_S115.2023.031.17.59.G07_0001.0001_nc
Example LDM Configuration file REQUEST line:
REQUEST EXP “spireert/level2/wetPf2” upstream_IDD_relay
Example LDM pattern-action file action:
EXP spireert/level2/wetPf2/([0-9]{4}).([0-9]{3})/(wetPf2.*_nc)
    FILE    -close    -overwrite
    /data/ldm/pub/native/COSMIC/spireert/wetPf2/\3

WMO BUFR (bfrPrf)

A low resolution (200 meter) atmospheric profile in the BUFR format. Contains data taken from the atmPhs, atmPrf and wetPrf files, including: header information, occultation location and time; bending angle versus impact parameter profiles; refractivity versus mean sea level geometric height; pressure, temperature, and moisture versus geopotential height profiles. References: https://cdaac-www.cosmic.ucar.edu/cdaac/cgi_bin/fileFormats.cgi?type=bfrPrf and https://preop.romsaf.org/romsaf_bufr.pdf.

Example LDM/IDD Product ID:
spireert/level2/bfrPrf/2023.031/bfrPrf_S115.2023.031.17.59.G07_0001.0001_bufr
Example LDM Configuration file REQUEST line:
REQUEST EXP “spireert/level2/bfrPrf” upstream_IDD_relay
Example LDM pattern-action file action:
EXP spireert/level2/bfrPrf/([0-9]{4}).([0-9]{3})/(bfrPrf.*_bufr)
    FILE    -close    -overwrite
    /data/ldm/pub/native/COSMIC/spireert/bfrPrf/\3

Absolute total electron content (podTec)

Absolute total electron content (TEC) and auxiliary data in netCDF format. Each file contains a TEC track data from one receiver-transmitter satellite pair. Reference: https://cdaac-www.cosmic.ucar.edu/cdaac/cgi_bin/fileFormats.cgi?type=podTec.

Example LDM/IDD Product ID:
spireert/level1b/podTec/2023.031/podTec_S149.2023.031.18.45.0014.G23.00_0001.0001_nc
Example LDM Configuration file REQUEST line:
REQUEST EXP “spireert/level1b/podTec” upstream_IDD_relay
Example LDM pattern-action file action:
EXP spireert/level1b/podTec/([0-9]{4}).([0-9]{3})/(podTec.*_nc)
    FILE    -close    -overwrite
    /data/ldm/pub/native/COSMIC/spireert/podTec/\3

To request all products:

Example LDM Configuration file REQUEST line:
REQUEST EXP “spireert” upstream_IDD_relay

For more information

For additional information regarding the data, please contact COSMIC at cosmicops@ucar.edu.

If you need assistance in configuring your LDM, or have other questions/comments regarding the LDM or IDD, please contact support-idd@unidata.ucar.edu.

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