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 spasial 15 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 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
SWIR
TIR
Band 4: 1.600 - 1.700 µm
Band 10: 8.125 - 8.475 µm
Band 5: 2.145 - 2.185 µm
Band 11: 8.475 - 8.825 µm
Band 6: 2.185 - 2.225 µm
Band 12: 8.925 - 9.275 µm
Band 7: 2.235 - 2.285 µm
Band 13: 10.25 - 10.95 µm
Band 8: 2.295 - 2.365 µm
Band 14: 10.95 - 11.65 µm
Band 9: 2.360 - 2.430 µm
ASTER Instrument Characteristics Characteristic
VNIR SWIR TIR
Ground Resolution Data Rate (Mbits/sec) Cross-track Pointing (deg.) Cross-track Pointing (km) Swath Width (km) Detector Type Quantization (bits)
15 m 62 ±24 ±31 60 Si 8
30m 90m 23 4.2 ±8.55 ±8.55 ±116 ±116 60 60 PtSi-Si HgCdTe 8 12
Aplikasi Citra Aster
Kota Paris
Geologi (Unconform)
Sedimentasi
Land use
Disaster (Badai Isabel)
Modis
Arkeologi
DEM
Level Data Aster •
• • •
•
DG Data Set Name ASTER L1A Reconstructed Unprocessed Instrument Data Granule Shortname AST_L1A Data Set Characteristics Area:~60 km x 60 km Image Dimensions: VNIR: 4200 rows x 4100 columns VNIR (3B): 5400 rows x 5000 columns SWIR: 2100 rows x 2048 columns TIR: 700 rows x 700 columns File Size: VNIR (1, 2, 3N) = ~ 50 Mb VNIR (3B) = ~ 30 Mb SWIR (4-9) = ~ 25 Mb TIR (10-14) = ~ 5 Mb Total = 110 Megabytes Spatial Resolution: VNIR = 15 m SWIR = 30 m TIR = 90 m Data Format: Hierarchical Data Format-Earth Observing System (HDF-EOS)
• • •
•
•
•
• •
EDG Data Set Name ASTER L1B Registered Radiance at the Sensor Granule Shortname AST_L1B Data Set Characteristics Area:~60 km x 60 km Image Dimensions: VNIR: 4200 rows x 4980 columns VNIR (3B): 4600 rows x 4980 columns SWIR: 2100 rows x 2490 columns TIR: 700 rows x 830 columns File Size: VNIR (1,2,3N) = ~ 60 Mb VNIR (3B) = ~ 22 Mb SWIR (4-9) = ~ 30 Mb TIR (10-14) = ~ 6 Mb Total = 118 Megabytes Spatial Resolution: VNIR = 15 m SWIR = 30 m TIR = 90 m Projection: Universal Transverse Mercator (UTM)Data Format: HDF-EOS Vgroup Data Fields: 15
• • •
EDG Data Set Name ASTER Digital Elevation Model Granule Shortname AST14DEM Data Set Characteristics Area: ~60 km x 60 km(ASTER Level-1A input image) Image Dimensions: ~2500 rows x 2500 columns Input Image Resolution: 15 meters Output Image Resolution: 30 meters File Size: ~25 MB Data Type: 32-bit signed integer Data Format: HDF-EOS Vgroup Data Fields: 1
•
• •
• • • • • •
EDG Data Set Name ASTER On-Demand L2 Polar Surface and Cloud Classification Granule Shortname AST13POL Data Set Characteristics Area:~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
