Imaging · collection · 2025
ASTER L2 Surface Radiance TIR V004
Listed in NASA Earthdata CMR and NASA Data Portal — shown once because both records carry DOI 10.5067/aster/ast_09t.004
The Terra Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Surface Radiance TIR (AST_09T) is generated using the five Thermal Infrared (TIR) bands (acquired either during the day or nighttime) between 8 and 12 µm spectral range.
Description
It provides surface-leaving radiance for the TIR bands at a spatial resolution of 90 meters, which includes both surface-emitted and surface-reflected components. It also provides the downwelling sky irradiance values (in W/m2/µm) for each of the TIR bands.
This product is atmospherically corrected, and the surface-leaving radiance is of known accuracy and valid only for clear-sky scenes (cloud-free pixels). This atmospherically corrected product provides the input for generating two other higher level products: surface spectral emissivity and surface kinetic temperature. The algorithm to correct atmospheric effects involves two elements.
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First, it uses a radiative transfer model—the Moderate Resolution Transmittance Code (MODTRAN)—which can estimate the magnitude of atmospheric emission, absorption, and scattering. MODTRAN calculates atmospheric transmittance and radiance for frequencies from 0 to 50,000 cmˉ¹ at moderate spectral resolution. Second, it identifies and incorporates all the necessary atmospheric parameters applicable to the location and time for which the measurements require correction, including temperature, water vapor, elevation, ozone, and aerosols.
Acquisitions for AST_09T ended on January 16, 2026, at 05:10:45 UTC, when the ASTER TIR instrument was permanently turned off due to power limitations on the Terra spacecraft. More information is available in this NASA Science News Brief.
Known Issues
* Level 2 products that are on the international date line/anti-meridian have incorrect bounding coordinates for the UTM zone defined in the file metadata.
- Data acquisition gaps: On November 28, 2024, one of Terra's power-transmitting shunt units failed. As a result, there was insufficient power to maintain functionality of the ASTER instrument. ASTER resumed acquisitions for the TIR bands on April 15, 2025. Users should note the data gap in ASTER acquisitions from November 28, 2024, through April 15, 2025, for TIR acquisitions.
Links
Get the data
- Resource doi.org/10.5067/aster/ast_09t.004 ↗
The LP DAAC product page provides information on Science Data Set layers and links for user guides, ATBDs, data access, tools, customer support, etc.
landing page · download · DOI / persistent id · from NASA CMR, data nasa gov
- PDF lpdaac.usgs.gov/documents/2265/ASTER_User_Guide_V4_pcP80n5.pdf ↗
The technical information in the User's Guide enables users to interpret and use the data products.
documentation · download · from NASA CMR, data nasa gov
- PDF lpdaac.usgs.gov/documents/1319/ASTER_User_Handbook_v4.pdf ↗
The ASTER User Handbook provides in depth information on ASTER data products.
documentation · download · from NASA CMR, data nasa gov
- Resource github.com/nasa/ASTER-Data-Resources/tree/main ↗
The ASTER Data Resources GitHub repository provides guides, short how-tos, and tutorials to help users access and work with ASTER data.
documentation · download · from NASA CMR, data nasa gov
- PDF lpdaac.usgs.gov/documents/76/AST_09_ATBD.pdf ↗
The ATBD provides physical theory and mathematical procedures for the calculations used to produce the data products.
documentation · download · from NASA CMR, data nasa gov
- Resource usgs.gov/media/videos/introducing-aster-version-4-whats-new-data-access… ↗
Introducing ASTER Version 4: What's New in Data Access, Products, Formats, and How to Unlock the ASTER Cloud Archive
documentation · download · from NASA CMR, data nasa gov
- search.earthdata.nasa.gov /search/granules?p=C3306887110-LPCLOUD ↗
Earthdata Search allows users to search, discover, visualize, refine, and access NASA Earth Observation data.
download · from NASA CMR
- Original Metadata cmr.earthdata.nasa.gov/search/concepts/C3306887110-LPCLOUD.iso19115 ↗
download · from data nasa gov
- JPEG data.lpdaac.earthdatacloud.nasa.gov/lp-prod-public/AST_09T.004/AST_09T_00410032004184431_202504011… ↗
download · preview image · from data nasa gov, NASA CMR
- Resource earthdata.nasa.gov/centers/lp-daac ↗
The LP DAAC website provides detailed information on discovery, distribution, access, and support of land data products.
download · project · from data nasa gov, NASA CMR
- Resource asterweb.jpl.nasa.gov ↗
The ASTER home page is maintained through NASA's Jet Propulsion Laboratory and documents various aspects of the ASTER mission.
download · project · from data nasa gov, NASA CMR
Where it is published
- NASA Data Portal dataset page data.nasa.gov/dataset/aster-l2-surface-radiance-tir-v004 ↗
landing page · from data nasa gov
Catalogue records · 3
- CMR UMM-JSON cmr.earthdata.nasa.gov/search/concepts/C3306887110-LPCLOUD.umm_json ↗
metadata API · from NASA CMR
- CKAN API data.nasa.gov/api/3/action/package_show?id=6b05ab94-cb32-4d93-b8a9-70eac3f80… ↗
metadata API · from data nasa gov
- CMR record cmr.earthdata.nasa.gov/search/concepts/C3306887110-LPCLOUD.html ↗
catalogue entry · from NASA CMR
Topics
- Stated by source
- Advanced Spaceborne Thermal Emission and Reflection Radiometer · Earth Observing System, Terra (AM-1) · Infrared Flux · Infrared Imagery · Infrared Radiance · Thermal Infrared
- From keywords
- Astronomy & Astrophysics · Earth & Environmental Science · Engineering · Ocean & Atmospheric Science · Physics
Provenance · 2 source records, 21 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Earthdata CMR | C3306887110-LPCLOUD | 9 d ago | JSON v1 |
| NASA Data Portal | 6b05ab94-cb32-4d93-b8a9-70eac3f803d1 | 6 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[field].local:field:astronomy | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[field].local:field:earth-environmental | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[field].local:field:engineering | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[field].local:field:ocean-atmospheric | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[field].local:field:physics | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[instrument].gcmd_instrument:aster | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/spectral-engineering/infrared-wavelengths/infrared-flux | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/spectral-engineering/infrared-wavelengths/infrared-imagery | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/spectral-engineering/infrared-wavelengths/infrared-radiance | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/spectral-engineering/infrared-wavelengths/thermal-infrared | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[platform].gcmd_platform:terra | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| created_date | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| description | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/Abstract |
| license_text | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| publication_date | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| spatial | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/SpatialExtent |
| temporal | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/TemporalExtents |
| title | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/EntryTitle |
| updated_date | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| version_label | source · NASA CMR | connector:nasa_cmr@1.0.0 |