ASTER User's Guide - Aster - NASA

ASTER Users Handbook
There are a few occasions when we do not receive the parent Level-1A granule or receive them
late from GDS, Japan. Under such circumstances, the Level-1B will not be mappable to its
parent Level-1A granule, and hence the inactive “View Image” button.
What are the average sizes of ASTER L1A and L1B data sets, and how are the data
quantized?
The ASTER Level-1A data set contains image and ancillary data from all 3 sensors (assuming
data from all three sensors were collected). The average sizes of these 14 channels or bands for
L1A and L1B data sets are:
Sensor/Telescope ASTER L1A (Megabytes) ASTER L1B (Megabytes)
VNIR (Bands 1, 2, 3N) 51,660,000 62,748,000
VNIR (Band 3B) 23,000,000 22,908,000
SWIR (Bands 4 through 9) 25,804,800 31,374,000
TIR (Bands 10 through 14) 4,900,000 5,810,000
Total 107 Megabytes 118 Megabytes
VNIR and SWIR are 8-bit unsigned integer data, and TIR are 16-bit unsigned integer data.
What are the image dimensions of an ASTER L1A and L1B data set?
The image dimensions for an ASTER L1A and L1B data set are:
Sensor/Telescope ASTER L1A ASTER L1B
VNIR: (Bands 1, 2, 3N) 4200 rows x 4100 columns 4200 rows x 4980 columns
VNIR: (Band 3B) 4600 rows x 5400 columns 4600 rows x 4980 columns
SWIR: (Bands 4 through 9) 2100 rows x 2048 columns 2100 rows x 2490 columns
TIR: (Bands 10 through 14) 700 rows x 700 columns 700 rows x 830 columns
What are the areal dimensions of an ASTER image?
The nominal size of an ASTER Level-1 scene is about 60 km by 60 km. This is only slightly
larger for the VNIR 3B image (which is used in generating stereoscopic images for producing
DEMs).
Could you help me understand the file naming convention of an ASTER Level-1 data set?
The ASTER Level-1 File naming convention (from GDS) breaks down as follows:
pg-PR1B0000-2001021503_007_001
PR1B0000: Processing level
2001: Production date (year)
02: Production date (month)
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