Part of the International MODIS/AIRS Processing Package (IMAPP)
November 5, 2003: Version 1.0 released
The polar-orbiting Aqua
spacecraft, launched by NASA in May 2002, provides an X-band direct broadcast
service where data from all science instruments is downlinked to the Earth
in near real-time. The AIRS/AMSU/HSB Level 1 Processing Package allows any
ground station capable of receiving direct broadcast from Aqua to produce
calibrated and geolocated AIRS, AMSU, and HSB Level 1B products. This package
is functionally identical to the operational AIRS/AMSU/HSB package running
at the GSFC DAAC, with
the following additions:
This is a binary-only release for Red Hat Intel Linux and Sun Solaris (SPARC) platforms. No source code is included. This version of the package has been tested on the following platforms:
Red Hat Intel Linux:
7.3, 8.0, 9
Sun Solaris (SPARC): 7, 8, 9
The input expected by the package is Level 0 AIRS,
AMSU, HSB, and GBAD files, defined as reconstructed time-ordered CCSDS packets with
all communication artifacts (including duplicate and bad packets) removed.
This includes PN and Reed Solomon decoding as well as reassembly of the raw
telemetry packets. Processing of the data stream to this stage is the responsibility
of the user. Data in this format is known as a Production Data Set (PDS).
The Direct Readout Laboratory at NASA GSFC has developed a software application named RT-STPS (Real-Time Software Telemetry Processing System), which synchronizes the data, performs PN and RS decoding and packet reassembly, and writes the output in PDS format. This package is know to be compatible with Level 0 PDS files created by RT-STPS. In addition, many X-band ground station vendors supply processing hardware and/or software that creates compatible Level 0 files.
The package is available for download by anonymous FTP at
Please read the
AIRS_README.txt file for instructions on
installing and running the package. If you are unable to download the package
because of a slow Internet connection, please contact us and we will arrange
to ship the package to you on DVD, CD, or DLT media. This package is released
under the terms of a NASA GSFC
Release and Usage Agreement.
November 5, 2003 (v 1.0) First release
The format of the AIRS, AMSU, and HSB Level 1B output
files is identical to the format of the equivalent GSFC DAAC Level 1B files.
The format is HDF-EOS, and all ECS metadata fields are present. Regardless
of the size of the direct broadcast pass, the output files will be split
into standard AIRS 6-minute granules. Therefore the leading and/or trailing
granules created from a direct broadcast pass will contain some missing data.
This package was developed at NASA Jet Propulsion Laboratory by Quyen Nguyen,
Richard Forrister and Evan Manning under NASA RTOP 622-40-45-03 in support
of the AIRS Project at NASA Jet Propulsion Laboratory under NASA NPO-21132.
This package is supported at SSEC by Liam Gumley, Allen Huang, Kevin Baggett, and Elisabeth Weisz, as part of the International MODIS/AIRS Processing Package (IMAPP). IMAPP is funded by NASA under grant NAG5-13402.
Related Links for AIRS/AMSU/HSB
leapsec.dat | utcpole.dat | definitive attitude/ephemeris
Level 0 data:
Univ. of Wisconsin | NASA GSFC
Level 1B data:
Univ. of Wisconsin | GSFC DAAC Data Pool
Home | GSFC DAAC | Algorithm Theoretical Basis Documents
Home | Orbit Tracks | Overpass Prediction | NORAD TLE orbital elements
EOS direct broadcast information:
Home | GSFC Direct Readout Laboratory