This product is generated from Level 0 data by applying parallax correction and geometric correction and is segmented into scenes. Radiometeric corrections and projection parameters are computed but not applied to the data. The values are appended in the metadata files.
ASTER Registered radiance at sensor
standard (AST L1B)
expedited (AST L1BE)
This product contains radiometrically calibrated and geometrically co-registered data for the acquired channels of the three different telescopes of Level-1A data. The Level-1B data set is produced by applying the radiometric calibration and geometric correction coefficients to the Level-1A.
ASTER Surface radiance — VNIR, SWIR
crosstalk corrected SWIR (AST09XT)
This product contains surface radiance for each of the nine VNIR and SWIR bands at 15 m and 30 m resolutions, respectively. The results are obtained by applying an atmospheric correction to radiances reported by the ASTER sensor to remove effects due to changes in satellite-sun geometry and atmospheric conditions.
ASTER Surface radiance TIR (AST09T)
This product provides surface leaving radiance and down welling sky irradiance for the five ASTER TIR channels at 90 m spatial resolution. Atmospheric correction has been applied and the surface leacing radiance is valid for the clear sky portion of scenes. This radiance includes both surface emitted and surface reflected components.
ASTER Surface reflectance — VNIR, SWIR
crosstalk corrected SWIR (AST07XT)
The Level 2 surface reflectance data set contains surface reflectance for each of the nine VNIR and SWIR bands at 15 m and 30 m resolutions, respectively. The results are obtained by applying an atmospheric correction to radiances reported by the ASTER sensor to remove effects due to changes in satellite-sun geometry and atmospheric conditions.
ASTER Surface emissivity (AST05)
This product contains surface emissivity at 90 m resolution generated only over land from ASTER's five thermal infrared channels. The emissivity product is critical for deriving accurate land surface temperatures and is therefore important in studies of surface energy and water balance. It is also useful for mapping geologic and landcover features.
ASTER Digital elevation model (AST14DEM)
This data set contains topographic information derived from the along-track, 15 m ASTER optical stereo data acquired in near infrared bands. These DEMs have a high spatial resolution (7 to 10 m) and can be used to derive absolute slop and slope aspect good to 5 degrees over horizontal distances of more than 100 meters. ASTER DEMs should meet 1:50,000 to 1:250,000 map accuracy standards.
ASTER Ortho + DEM (AST14DMO)
The orthorectictified radiance product takes the Level 1B radiance channels and applies an ASTER-derived DEM to orthorectify the 15 bands. The resulting images have elevation-produced parallax removed, reslutling in images where every pixel appears as if viewed from directly overhead. The ortho + DEM product combines the orthorectified radiance product and the digital elevation model product.
ASTER Global DEM (AST-GDEM)
The Global Digital Elevation Model is produced by stereocorrelation of the entire ASTER daytime archive of approximately 1,400,000 Level 1 scenes. Each image was cloud-screened and then a DEM created for individual scenes. DEMS were averaged for each pixel.
The North American ASTER Land Surface Emissivity Database covers the continent with 3,327 1 degree (°) x 1° tiles of 100-meter (m) resolution data. The data are placed in geographic coordinates (latitude, longitude) and distributed as Hierarchical Data Format Version 5 (HDF5) files.