TRMM Attitude and VIRS Packets and Header Record L1A V7 (TRMM_1A01) at GES DISC

The Level-1A Product file, "1A01", is a concatenation of Header record, Spacecraft Attitude packets, VIRS Housekeeping Data packets, VIRS Science Data packets, QACs, and an MDUL. As such, it is reversible to Level 0. The header record contains information pertaining to orbit times, orbit number, times of the first scan, and number of scans, among other things. The Level 0 data contain the actual channel data expressed as "sensor counts". A Level 1A file contains data for a single orbit and has a file size of about 31 MB (uncompressed). There are 16 files of VIRS 1A01 data produced per day.

The Visible and Infrared Scanner (VIRS) is a five-channel visible/infrared radiometer, which builds on the heritage of theAdvanced Very High Resolution Radiometer (AVHRR) instrument flown aboard the NOAA series of Polar-Orbiting Operational EnvironmentalSatellites (POES). The VIRS detects radiation at 1 visible, 2 near infrared and 2 thermal infrared wavelengths, allowing determination of cloud coverage, cloud top height and temperature, and precipitation indices. The central wavelengths for the VIRS channels are 0.63, 1.60,3.75, 10.8, and 12.0 microns. All channels are in operation during the daytime, but only channels 3, 4 and 5 operate during the nighttime.

Spatial coverage is between 38 degrees North and 38 degrees South owing to the 35 degree inclination of the TRMM satellite. This orbit provides extensive coverage in the tropics and allows each location to be covered at a different local time each day, enabling the analysis of the diurnal cycle of precipitation.

Data and Resources

Additional Info

Field Value
Maintainer ANDREY SAVTCHENKO
Last Updated April 1, 2025, 2:49 AM (UTC+00:00)
Created April 1, 2025, 2:49 AM (UTC+00:00)
accessLevel public
bureauCode 026:00
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_@id https://data.nasa.gov/data.json
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
citation Tropical Rainfall Measuring Mission (TRMM). 2011-07-01. TRMM_1A01. TRMM Attitude and VIRS Packets and Header Record L1A V7. Greenbelt, MD. Archived by National Aeronautics and Space Administration, U.S. Government, Goddard Earth Sciences Data and Information Services Center (GES DISC). https://disc.gsfc.nasa.gov/datacollection/TRMM_1A01_7.html.
creator Tropical Rainfall Measuring Mission (TRMM)
graphic-preview-file https://docserver.gesdisc.eosdis.nasa.gov/public/project/Images/TRMM_1A01_7.png
harvest_object_id 6cd8fca0-9ad9-4726-a59f-dc2f35e670ed
harvest_source_id 61638e72-b36c-4866-9d28-551a3062f158
harvest_source_title DNG Legacy Data
identifier C1282248315-GES_DISC
issued 1997-12-20
landingPage https://cmr.earthdata.nasa.gov:443/search/concepts/C1282248315-GES_DISC.html
language en-US
metadata_type geospatial
modified 2014-03-21
programCode 026:001
publisher NASA/GSFC/SED/ESD/GCDC/GESDISC
release-place Greenbelt, MD
resource-type Dataset
series-name TRMM_1A01
source_datajson_identifier true
source_hash 984c55f6d6e3789f311b296188039da492e8d1f1cc6b94df54783bf691a2d3bd
source_schema_version 1.1
spatial -180.0 -38.0 180.0 38.0
temporal 1997-12-20T00:00:00Z/2014-03-21T23:59:59.999Z
theme TRMM,geospatial