ASTER Simulated Data Sets

Death Valley Data Set

The Death Valley data set is a simulation of ASTER Level 1B data in units of radiance using the nominal instrument gain settings. It is arranged in three smaller data sets, one for each subsystem (VNIR, SWIR, TIR.) The data set was created from spectrally resampled AVIRIS images and TIMS images, that were then co-registered, and spatially resampled to the appropriate ASTER pixel sizes for each subsystem (15m - VNIR, 30m - SWIR, and 90m -TIR). The SWIR and TIR data sets were then sized up using pixel replication to have the same number of samples and lines as the VNIR data set. The area covered by the data is 12 x 51 km.

All channels have values in radiance units (Watts per square meter per steradian per micrometer), but have been rescaled to fit within the constraints of 8 bit (for VNIR and SWIR) and 16 bit (for TIR) data formats. To get the correct radiance value, you must multiply each pixel value by the gain size listed for each bands.

Death Valley ASTER VNIR bands 1, 2, 3

• 3 bands, Band Sequential format, BYTE, 816 bytes/line (samples), 3408 lines
• Physical units are W/m²/sr/um

Death Valley ASTER SWIR bands 4, 5, 6, 7, 8, 9

• 6 bands, Band sequential format, BYTE, 816 bytes/line, (samples), 3408 lines
• Physical units are W/m²/sr/um

Death Valley ASTER TIR bands 10, 11, 12, 13, 14

• 5 bands, Band sequential format, INTEGER, 1632 bytes/line (816 samples), 3408 lines
• Physical units are mW/m²/sr/um