Post on 05-Jan-2016
transcript
ASTER Instrument
VNIR Visible/Near Infrared Radiometer# of Bands: 3 Nadir + 1 Aft-LookingSpatial Resolution: 15 m
SWIR Short Wave Infrared Radiometer# of Bands: 6 NadirSpatial Resolution: 30 m
TIR Thermal Infrared Radiometer# of Bands: 5 NadirSpatial Resolution: 90 m
Has 3 sensors and detects 14 bands of spectrum. Launched December 1999 Ground resolution is 15m ~ 90m.
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 GEOSSat Capetown Summit 2007.
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 ASTER Global Digital Elevation Model (GDEM)(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
Eyjafjallajökull Iceland Volcano Eyjafjallajökull Iceland Volcano EruptionEruption
Time-lapse photo of eruption cloud and lightningTime-lapse photo of eruption cloud and lightning
Eyjafjallajökull Iceland Volcano Eyjafjallajökull Iceland Volcano EruptionEruption
April 1 perspective view showing early phase of lava flow and lahar emplacementApril 1 perspective view showing early phase of lava flow and lahar emplacement
Eyjafjallajökull Iceland Volcano Eyjafjallajökull Iceland Volcano EruptionEruption
April 19 MODIS image of ash plume. April 19 MODIS image of ash plume.
ASTER image
Eyjafjallajökull Iceland Volcano Eyjafjallajökull Iceland Volcano EruptionEruption
April 19 image of ash plume. Red is thermal infrared signature of active vent and earlier flows.April 19 image of ash plume. Red is thermal infrared signature of active vent and earlier flows.
Eyjafjallajökull Iceland Volcano Eyjafjallajökull Iceland Volcano EruptionEruption
April 19 image of ash plume. Thermal infrared channels highlight ash vs SO2 in plume.April 19 image of ash plume. Thermal infrared channels highlight ash vs SO2 in plume.
Baja California April 4 Earthquake, M=7.2Baja California April 4 Earthquake, M=7.2
Sub-pixel co-registration of before and Sub-pixel co-registration of before and after ASTER images allows after ASTER images allows determination of displacements between determination of displacements between images. The results indicate ~4m of images. The results indicate ~4m of right-lateral offset, and ~1 m vertical right-lateral offset, and ~1 m vertical offset. This is in agreement with several offset. This is in agreement with several field observations.field observations.
Courtesy Dr. Sebastien Leprince, Caltech
April 20 Gulf of Mexico Oil SpillApril 20 Gulf of Mexico Oil Spill
Oil PlatformOil Platform
ShipShip
May 1 ASTER image of oil May 1 ASTER image of oil spill, ~20 miles from spill, ~20 miles from Mississippi DeltaMississippi Delta