ASTER Advanced Spaceborne Emission and Reflection Radiometer.

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Presentation transcript:

ASTER Advanced Spaceborne Emission and Reflection Radiometer

ASTER Instrument VNIR Visible/Near Infrared Radiometer # of Bands: 3 Nadir + 1 Aft- Looking Spatial Resolution: 15 m SWIR Short Wave Infrared Radiometer # of Bands: 6 Nadir Spatial Resolution: 30 m TIR Thermal Infrared Radiometer # of Bands: 5 Nadir Spatial Resolution: 90 m  Has 3 sensors and detects 14 bands of spectrum.  Launched December 1999  Ground resolution is 15m ~ 90m.

ASTER Data Acquisition

Methodology ASTER GDEM ASTER coverage (~1.5 million scenes in summer 2008) Deeper red indicates more data accumulated. Generation of a seamless tile of DEM using all ASTER data ever acquired over the tile A seamless Tile of DEM GEOSS Both US and Japan committed to contribute to GEOSS at Capetown Summit Contribution to Global coverage Automated processing ASTER scene (60km x 60km) Tile (1 arc degree square) 1. Stereo-correlate entire ~ 1.5 million scene ASTER Archive; 2. Cloud mask to remove cloudy pixels; 3. Stack all DEMS & remove residual bad values and outliers; 4. Partition data into 1º x 1º tiles --- SRTM3 coverage

ASTER Global Digital Elevation Model (GDEM)  23,000 1x1 degree tiles  30 m postings  Released June 2009  Available thru LPDAAC & GDS  Free to ALL users  Version 2 to be released Spring 2011

Various Disasters

Eyjafjallajökull Iceland Volcano Eruption Time-lapse photo of eruption cloud and lightning

Eyjafjallajökull Iceland Volcano Eruption April 1 perspective view showing early phase of lava flow and lahar emplacement

Eyjafjallajökull Iceland Volcano Eruption April 19 MODIS image of ash plume. ASTER image

Eyjafjallajökull Iceland Volcano Eruption April 19 image of ash plume. Red is thermal infrared signature of active vent and earlier flows.

Eyjafjallajökull Iceland Volcano Eruption April 19 image of ash plume. Thermal infrared channels highlight ash vs SO2 in plume.

Baja California April 4 Earthquake, M=7.2

Sub-pixel co-registration of before and after ASTER images allows determination of displacements between images. The results indicate ~4m of right-lateral offset, and ~1 m vertical offset. This is in agreement with several field observations. Courtesy Dr. Sebastien Leprince, Caltech

April 20 Gulf of Mexico Oil Spill Oil Platform Ship May 1 ASTER image of oil spill, ~20 miles from Mississippi Delta

April 20 Gulf of Mexico Oil Spill May 1: visible (left); thermal (right) showing current fronts, oil thickness, and attempts to burn oil.