SATELIT ASTER

Oleh : Like Indrawati

ADVANCED SPACEBORNE THERMAL EMISSION

AND REFLECTION RADIOMETER (ASTER)

ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) adalah instrumen/sensor yang dipasang pada satelit Terra, yang diluncurkan pada Desember 1999, dimana ini merupakan bagian dari NASA's Earth Observing System (EOS) bekerja sama dengan Jepang.

ASTER digunakan untuk pemetaan land surface temperature, emissivity, reflectance dan elevation.

Platforms EOS adalah bagian dari NASA's Earth Science Enterprise, dimana lembaga ini merupakan lembaga yang baik untuk penelitian biosphere, hydrosphere, lithosphere and atmosphere.

ADVANCED SPACEBORNE THERMAL EMISSION

AND REFLECTION RADIOMETER (ASTER)

• Citra resolusi tinggi untuk observasi permukaan lahan, air, dan awan dari panjang gelombang tampak hingga inframerah thermal untuk studi climatological, hydrological, biological, and geological.

• terdiri dari tiga subsystems: VNIR, SWIR, TIR

• 3 channels di visible dan near IR dengan resolusi spasial15 m

• SWIR-mempunyai 6 channels dalam shortwave IR dengan resolusi spasial 30m

• TIR-mempunyai 5 channels dalam thermal IR dengan resolusi spasial 90 m

• Lebar liputan 60km.

• DEM Creation possible

NASA Earth Observing System (EOS)

• Earth Observing System (EOS)

• – integrated measurements of the Earth's processes

• – science component

• – data system supporting a coordinated series of polar-orbiting

• and low-inclination satellites for long-term global observations of

• the land surface, biosphere, solid Earth, atmosphere, and oceans.

• 19 satellites 1997-2010

TERRA / AQUA

• Launch date: December 1999, May 2002

• Orbit: 705 km altitude, polar

• Orbit period: 98.88 minutes

• Equator crossing: 10:30 AM TERRA dan 1.30PM AQUA

Moderate Resolution Imaging Spectroradiometer (MODIS)

Advanced Spaceborne Thermal Emission Radiometer (ASTER)

Multi-angle Imaging Spectroradiometer (MISR)

Measurement of Pollution in the Troposphere (MOPITT)

Clouds and the Earth Radiant Energy System (CERES)

ASTER Spectral Range

VNIR SWIR TIR

Band 1

0.52 - 0.60 µm

Nadir looking

Band 2

0.63 - 0.69 µm

Nadir looking

Band 3

0.76 - 0.86 µm

Nadir looking

Band 3

0.76 - 0.86 µm

Backward looking

Band 4: 1.600 - 1.700 µm

Band 5: 2.145 - 2.185 µm

Band 6: 2.185 - 2.225 µm

Band 7: 2.235 - 2.285 µm

Band 8: 2.295 - 2.365 µm

Band 9: 2.360 - 2.430 µm

Band 10: 8.125 - 8.475 µm

Band 11: 8.475 - 8.825 µm

Band 12: 8.925 - 9.275 µm

Band 13: 10.25 - 10.95 µm

Band 14: 10.95 - 11.65 µm

ASTER Instrument Characteristics

Characteristic VNIR SWIR TIR

Ground Resolution 15 m 30m 90m

Data Rate (Mbits/sec) 62 23 4.2

Cross-track Pointing (deg.) ±24 ±8.55 ±8.55

Cross-track Pointing (km) ±31 ±116 ±116

Swath Width (km) 60 60 60

Detector Type Si PtSi-Si HgCdTe

Quantization (bits) 8 8 12

Aplikasi Citra Aster

Kota Paris

Geologi (Unconform)

Sedimentasi

Land use

Disaster (Badai Isabel)

Modis

Aster

Arkeologi

DEM

Level Data Aster

• DG Data Set NameASTER L1A Reconstructed Unprocessed Instrument Data

• Granule ShortnameAST_L1A

• Data Set CharacteristicsArea:~60 km x 60 km

• Image Dimensions:VNIR: 4200 rows x 4100 columnsVNIR (3B): 5400 rows x 5000 columnsSWIR: 2100 rows x 2048 columnsTIR: 700 rows x 700 columnsFile Size:VNIR (1, 2, 3N) = ~ 50 MbVNIR (3B) = ~ 30 MbSWIR (4-9) = ~ 25 MbTIR (10-14) = ~ 5 MbTotal = 110 Megabytes

• Spatial Resolution:VNIR = 15 mSWIR = 30 mTIR = 90 mData Format:Hierarchical Data Format-Earth Observing System (HDF-EOS)

• EDG Data Set NameASTER L1B Registered Radiance at the Sensor

• Granule ShortnameAST_L1B

• Data Set CharacteristicsArea:~60 km x 60 km

• Image Dimensions:VNIR: 4200 rows x 4980 columnsVNIR (3B): 4600 rows x 4980 columnsSWIR: 2100 rows x 2490 columnsTIR: 700 rows x 830 columnsFile Size:VNIR (1,2,3N) = ~ 60 MbVNIR (3B) = ~ 22 MbSWIR (4-9) = ~ 30 MbTIR (10-14) = ~ 6 MbTotal = 118 Megabytes

• Spatial Resolution:VNIR = 15 mSWIR = 30 mTIR = 90 mProjection:

• Universal Transverse Mercator (UTM)Data Format:

• HDF-EOS

• Vgroup Data Fields: 15

• EDG Data Set NameASTER Digital Elevation Model

• Granule ShortnameAST14DEM

• Data Set CharacteristicsArea: ~60 km x 60 km(ASTER Level-1A input image)Image Dimensions: ~2500 rows x 2500 columnsInput Image Resolution: 15 metersOutput Image Resolution: 30 metersFile Size: ~25 MBData Type: 32-bit signed integerData Format: HDF-EOSVgroup Data Fields: 1

• EDG Data Set NameASTER On-Demand L2 Polar Surface and Cloud Classification

• Granule ShortnameAST13POL

• Data Set CharacteristicsArea:~60 km x 60 kmImage Dimensions:4200 rows x 4980 columns

• File Size:~42 MBInput Image Resolution:30 meters

• Units:Thematic

• Projection:Universal Transverse Mercator (UTM)

• Data Format:

• HDF-EOS

• Vgroup Data Fields:Surface Radiance:1