ASTER (Image Credit: Satpalda)

ASTER was launched in 1999 and remains fully operational. Flying at an altitude of 438 miles, ASTER has a 16-day revisit period and follows a sun-synchronous polar orbit. Each ASTER acquisition is approximately 60km by 60km . The ASTER instrument acquires information across the visible and infrared spectrums. Specifically, information is acquired by three separate instruments:VNIR (Visible and Near-Infrared Radiometer), SWIR (ShortWave Infrared Radiometer),and TWIR (Thermal Infrared Radiometer).

ASTER Specifications:

ResolutionVNIR 15 m
SWIR 30 m
TIR 90 m
Nominal Swath Width60 km at Nadir
BandsVNIR Band 1 (Green): 520-600 nm
VNIR Band 2 (Red): 630-690 nm
VNIR Band 3 (NIR): 780-860 nm
SWIR Band 4: 1.6-1.7 µm
SWIR Band 5: 2.145-2.185 µm
SWIR Band 6: 2.185-2.225 µm
SWIR Band 7: 2.235-2.285 µm
SWIR Band 8: 2.295-2.365 µm
WIR Band 9: 2.36-2.43 µm
(SWIR sensor is no longer working presently. All data collect post 2007 has blank SWIR bands)
TIR Band 10: 8.125-8.475 µm
TIR Band 11: 8.475-8.825 µm
TIR Band 12: 8.925-9.275 µm
TIR Band 13: 10.25-10.95 µm
TIR Band 14: 10.95-11.65 µm
Archive AvailabilityFrom 1999
Minimum Area of PurchaseFull scenes only
Stereo AvailableYES, along track stereo from Level 1A VNIR bands 3N and 3B
Best Scale1:25,000 – VNIR & SWIR
1:50,000 – SWIR
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