NRT data products are currently available for Level-1B and Level-2. Please select the link from the table below for a description of that AIR NRT data product, with links to the data files and documentation.
Accuracy of Orbit (impacts geolocation of NRT products): Operational data production uses the rectified orbital parameters and satellite position that is accurate to better than 50 meters. NRT data production uses predicted orbital parameters, required to be accurate to 400 meters and generally accurate to 100 meters. Orbital prediction is slightly less accurate towards the end of the day UTC. Solar flares impact the accuracy of the orbit prediction. An evaluation of the predicted orbital ephemeris for the current day is available after 1600 UT at http://rapidfire.sci.gsfc.nasa.gov/ephdiff/
AIRS NRT Data Products (7 most recent days available)
| AIRIBRAD_NRT | L1B IR geolocated radiances | 13.5 km@nadir | 56 |
| AIRVBRAD_NRT | L1B Vis/Near IR geolocated radiances | 2.3 km @ nadir | 11 |
| AIRABRAD_NRT | L1B AMSU-A1 & AMSU-A2 combined, geolocated & calibrated brightness temperatures | 45 km @ nadir | 0.6 |
| AIRIBQAP_NRT | L1B IR quality assurance subset | N/A | 2.4 |
| AIRVBQAP_NRT | L1B Vis/Near IR quality assurance subset | N/A | 1.1 |
| AIRX2RET_NRT | L2 standard retrieval product using AIRS IR and AMSU | 45 km @ nadir | 2.3 |
| AIRI2CCF_NRT | L2 cloud-cleared radiances using AIRS IR and AMSU | 45 km @ nadir | 9.5 |
| AIRX2SUP_NRT | L2 support product using AIRS IR and AMSU | 45 km @ nadir | 12.8 |
AIRS NRT Data Products via Anonymous FTP
Product | Server | Directory Path |
Level-1B | | /data/s4pa/Aqua_AIRS_NearRealTime |
Level-2 |
The Open Geospatial Consortium (OGC) Web Map Service (WMS) is an interface that allows the use of data and enables clients to build customized maps with data coming from a different network. Below shows pictures of AIRS Near Real Time data, served via Web Map Service (WMS).
The AIRS NRT images consist of AIRS granules mapped to a global cylindrical projection. The granules are mapped as they arrive from the NRT production line, for a given Calendar Day. No averaging is applied, and hence data are simply overlaid on the map. For improved presentability, the maps are larger, and hence with finer resolution, than the native data resolution would allow. To achieve that, the data are resampled using the nearest neighbor approach. As a result, certain pixilation can be seen in the maps, but this effect actually correctly reflects the data footprint location, projection, and size on the maps, using rectangular idealization. Since data are projected in near-real time, it is for the given UTC calendar day. Thus produced daily maps will look different from the standard operational products, where the range of the data-day is defined differently.
- CO: Total column CO (from Level 2 AIRX2RET_NRT)
- RGB: False-color image using 3 visible channles (from Level 1B AIRVBRAD_NRT)
- BT_diff_SO2 : Brightness temperature difference Tb(1361,44cm-1)-Tb(1433.06 cm-1) used as an indicator of SO2 release from volcanoes. Values under -6K (deep red in the images) have likely volcanic SO2 (from Level 1 AIRIBQAP_NRT)
Atmos Composition
