The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) is a multispectral imager that was launched on board NASA's Terra spacecraft in December, 1999. ASTER can collect data in 14 spectral bands from the visible to the thermal infrared. Each scene covers an area of 60 x 60 km. These scenes, produced by the USGS, contain calibrated at-sensor radiance, ortho-rectified and terrain corrected.
Not all 14 bands were collected in each scene. An asset property named ORIGINAL_BANDS_PRESENT contains the list of bands that are present in each scene.
To convert from Digital Numbers (DN) to radiance at the sensor, the unit conversion coefficients are available in the metadata. See ASTER L1T Product Users' Guide and ASTER L1T Product Specification for more information.
先进的星载热发射和反射辐射计 (ASTER) 是一种多光谱成像仪,于 1999 年 12 月在 NASA 的 Terra 航天器上发射。ASTER 可以收集从可见光到热红外的 14 个光谱波段的数据。每个场景的面积为 60 x 60 公里。这些场景由 USGS 制作,包含校准的传感器辐射、正射校正和地形校正。
并非每个场景中都收集了所有 14 个波段。名为 ORIGINAL_BANDS_PRESENT 的资产属性包含每个场景中存在的波段列表。
为了在传感器处从数字数 (DN) 转换为辐射,元数据中提供了单位转换系数。有关更多信息,请参阅 ASTER L1T 产品用户指南和 ASTER L1T 产品规格。
文档:
算法理论基础文件 (ATBD)
用户指导
ASTER Level-1T 产品规格
[ASTER L1T 快速参考指南](ASTER L1T 快速参考指南)](https://lpdaac.usgs.gov/documents/174/AST_L1T_Quick_Reference_Guide.pdf)
Documentation:
- Algorithm Theoretical Basis Document (ATBD)
- User's Guide
- ASTER Level-1T Product Specification
- [ASTER L1T Quick Reference Guide](ASTER L1T Quick Reference Guide)](https://lpdaac.usgs.gov/documents/174/AST_L1T_Quick_Reference_Guide.pdf)
Dataset Availability
2000-03-04T00:00:00 - 2021-08-31T00:00:00
Dataset Provider
NASA LP DAAC at the USGS EROS Center
Collection Snippet
ee.ImageCollection("ASTER/AST_L1T_003")
Bands Table
Name | Description | Min | Max | Resolution | Wavelength |
B01 | VNIR_Band1 (visible green/yellow) | 1 | 255 | 15 meters | 0.520-0.600µm |
B02 | VNIR_Band2 (visible red) | 1 | 255 | 15 meters | 0.630-0.690µm |
B3N | VNIR_Band3N (near infrared, nadir pointing) | 1 | 255 | 15 meters | 0.780-0.860µm |
B04 | SWIR_Band4 (short-wave infrared) | 1 | 255 | 30 meters | 1.600-1.700µm |
B05 | SWIR_Band5 (short-wave infrared) | 1 | 255 | 30 meters | 2.145-2.185µm |
B06 | SWIR_Band6 (short-wave infrared) | 1 | 255 | 30 meters | 2.185-2.225µm |
B07 | SWIR_Band7 (short-wave infrared) | 1 | 255 | 30 meters | 2.235-2.285µm |
B08 | SWIR_Band8 (short-wave infrared) | 1 | 255 | 30 meters | 2.295-2.365µm |
B09 | SWIR_Band9 (short-wave infrared) | 1 | 255 | 30 meters | 2.360-2.430µm |
B10 | TIR_Band10 (thermal infrared) | 1 | 4095 | 90 meters | 8.125-8.475µm |
B11 | TIR_Band11 (thermal infrared) | 1 | 4095 | 90 meters | 8.475-8.825µm |
B12 | TIR_Band12 (thermal infrared) | 1 | 4095 | 90 meters | 8.925-9.275µm |
B13 | TIR_Band13 (thermal infrared) | 1 | 4095 | 90 meters | 10.250-10.950µm |
B14 | TIR_Band14 (thermal infrared) | 1 | 4095 | 90 meters | 10.950-11.650µm |
影像属性:
Name | Type | Description |
BAD_PIXELS_B01 | Double | Number of bad pixels |
BAD_PIXELS_B02 | Double | Number of bad pixels |
BAD_PIXELS_B03 | Double | Number of bad pixels |
BAD_PIXELS_B04 | Double | Number of bad pixels |
BAD_PIXELS_B05 | Double | Number of bad pixels |
BAD_PIXELS_B06 | Double | Number of bad pixels |
BAD_PIXELS_B07 | Double | Number of bad pixels |
BAD_PIXELS_B08 | Double | Number of bad pixels |
BAD_PIXELS_B09 | Double | Number of bad pixels |
BAD_PIXELS_B10 | Double | Number of bad pixels |
BAD_PIXELS_B11 | Double | Number of bad pixels |
BAD_PIXELS_B12 | Double | Number of bad pixels |
BAD_PIXELS_B13 | Double | Number of bad pixels |
BAD_PIXELS_B14 | Double | Number of bad pixels |
CLOUDCOVER | Double | Cloud coverage |
COARSE_DEM_DATE | String | Coarse DEM issuance date |
COARSE_DEM_NOTE | String | Coarse DEM comments |
COARSE_DEM_VERSION | String | Coarse DEM version number |
FLYING_DIRECTION | String | The satellite flight direction when observation is done: 'AS' - ascending direction, 'DE' - descending direction |
GAIN_COEFFICIENT_B01 | Double | Coefficient used for radiance conversion |
GAIN_COEFFICIENT_B02 | Double | Coefficient used for radiance conversion |
GAIN_COEFFICIENT_B03 | Double | Coefficient used for radiance conversion |
GAIN_COEFFICIENT_B04 | Double | Coefficient used for radiance conversion |
GAIN_COEFFICIENT_B05 | Double | Coefficient used for radiance conversion |
GAIN_COEFFICIENT_B06 | Double | Coefficient used for radiance conversion |
GAIN_COEFFICIENT_B07 | Double | Coefficient used for radiance conversion |
GAIN_COEFFICIENT_B08 | Double | Coefficient used for radiance conversion |
GAIN_COEFFICIENT_B09 | Double | Coefficient used for radiance conversion |
GAIN_COEFFICIENT_B10 | Double | Coefficient used for radiance conversion |
GAIN_COEFFICIENT_B11 | Double | Coefficient used for radiance conversion |
GAIN_COEFFICIENT_B12 | Double | Coefficient used for radiance conversion |
GAIN_COEFFICIENT_B13 | Double | Coefficient used for radiance conversion |
GAIN_COEFFICIENT_B14 | Double | Coefficient used for radiance conversion |
GAIN_SETTING_B01 | String | Band gain setting: 'HGH' - high, 'NOR' - normal, 'LOW' - low, 'LO1' - low 1, or 'LO2' - low 2 |
GAIN_SETTING_B02 | String | Band gain setting: 'HGH' - high, 'NOR' - normal, 'LOW' - low, 'LO1' - low 1, or 'LO2' - low 2 |
GAIN_SETTING_B03 | String | Band gain setting: 'HGH' - high, 'NOR' - normal, 'LOW' - low, 'LO1' - low 1, or 'LO2' - low 2 |
GAIN_SETTING_B04 | String | Band gain setting: 'HGH' - high, 'NOR' - normal, 'LOW' - low, 'LO1' - low 1, or 'LO2' - low 2 |
GAIN_SETTING_B05 | String | Band gain setting: 'HGH' - high, 'NOR' - normal, 'LOW' - low, 'LO1' - low 1, or 'LO2' - low 2 |
GAIN_SETTING_B06 | String | Band gain setting: 'HGH' - high, 'NOR' - normal, 'LOW' - low, 'LO1' - low 1, or 'LO2' - low 2 |
GAIN_SETTING_B07 | String | Band gain setting: 'HGH' - high, 'NOR' - normal, 'LOW' - low, 'LO1' - low 1, or 'LO2' - low 2 |
GAIN_SETTING_B08 | String | Band gain setting: 'HGH' - high, 'NOR' - normal, 'LOW' - low, 'LO1' - low 1, or 'LO2' - low 2 |
GAIN_SETTING_B09 | String | Band gain setting: 'HGH' - high, 'NOR' - normal, 'LOW' - low, 'LO1' - low 1, or 'LO2' - low 2 |
GAIN_SETTING_B10 | String | Band gain setting: 'HGH' - high, 'NOR' - normal, 'LOW' - low, 'LO1' - low 1, or 'LO2' - low 2 |
GAIN_SETTING_B11 | String | Band gain setting: 'HGH' - high, 'NOR' - normal, 'LOW' - low, 'LO1' - low 1, or 'LO2' - low 2 |
GAIN_SETTING_B12 | String | Band gain setting: 'HGH' - high, 'NOR' - normal, 'LOW' - low, 'LO1' - low 1, or 'LO2' - low 2 |
GAIN_SETTING_B13 | String | Band gain setting: 'HGH' - high, 'NOR' - normal, 'LOW' - low, 'LO1' - low 1, or 'LO2' - low 2 |
GAIN_SETTING_B14 | String | Band gain setting: 'HGH' - high, 'NOR' - normal, 'LOW' - low, 'LO1' - low 1, or 'LO2' - low 2 |
GCP_CHIPS_CORRELATED | Double | How many chips correlated during correlation statistics creation |
GEOMETRIC_DB_DATE | String | Geometric correction data issuance date |
GEOMETRIC_DB_VERSION | String | Geometric correction data version number |
GRANULE_REPROCESSING | String | What reprocessing has been performed on the granule: 'not reprocessed', 'reprocessed once', 'reprocessed twice', or 'reprocessing n times' |
ORBIT_NUMBER | Double | The orbit number of the satellite when data is acquired |
ORIGINAL_BANDS_PRESENT | Double | List of bands that are present in each scene |
PGE_VERSION | String | The version of PGE |
PRODUCTION_TIME | Double | Generation time of this product |
QA_PERCENT_INTERPOLATED_DATA | Double | The percentage of interpolated data in the scene |
QA_PERCENT_MISSING_DATA | Double | The percentage of missing data in the scene |
QA_PERCENT_OUT_OF_BOUNDS_DATA | Double | The percentage of out of bounds data in the scene |
RADIOMETRIC_DB_DATE | String | Radiometric correction data issuance date |
RADIOMETRIC_DB_VERSION | String | Radiometric correction data version number |
RESAMPLING_METHOD_B01 | String | Resampling method: 'BL', 'NN', or 'CC' |
RESAMPLING_METHOD_B02 | String | Resampling method: 'BL', 'NN', or 'CC' |
RESAMPLING_METHOD_B03 | String | Resampling method: 'BL', 'NN', or 'CC' |
RESAMPLING_METHOD_B04 | String | Resampling method: 'BL', 'NN', or 'CC' |
RESAMPLING_METHOD_B05 | String | Resampling method: 'BL', 'NN', or 'CC' |
RESAMPLING_METHOD_B06 | String | Resampling method: 'BL', 'NN', or 'CC' |
RESAMPLING_METHOD_B07 | String | Resampling method: 'BL', 'NN', or 'CC' |
RESAMPLING_METHOD_B08 | String | Resampling method: 'BL', 'NN', or 'CC' |
RESAMPLING_METHOD_B09 | String | Resampling method: 'BL', 'NN', or 'CC' |
RESAMPLING_METHOD_B10 | String | Resampling method: 'BL', 'NN', or 'CC' |
RESAMPLING_METHOD_B11 | String | Resampling method: 'BL', 'NN', or 'CC' |
RESAMPLING_METHOD_B12 | String | Resampling method: 'BL', 'NN', or 'CC' |
RESAMPLING_METHOD_B13 | String | Resampling method: 'BL', 'NN', or 'CC' |
RESAMPLING_METHOD_B14 | String | Resampling method: 'BL', 'NN', or 'CC' |
SATELLITE_RECURRENT_CYCLENUMBER | Double | The satellite recurrent cycle number |
SATELLITE_REVOLUTION_NUMBER | Double | The satellite revolution number in the cycle |
SCENE_PATH | Double | Scene path |
SCENE_ROW | Double | Scene row |
SCENE_VIEW | Double | Scene view |
SOLAR_AZIMUTH | Double | Sun direction as seen from the scene center; azimuth angle in degrees measured eastward from North (0.0<az<360) |
SOLAR_ELEVATION | Double | Sun direction as seen from the scene center; elevation angle in degrees (-90.0<el<90.0) |
SOURCE_DATA_GRANULE | String | ID of input AST_L1A data granule used for generating this product |
SWIR_POINTING_ANGLE | Double | Pointing angle in degrees |
TIR_POINTING_ANGLE | Double | Pointing angle in degrees |
VNIR_POINTING_ANGLE | Double | Pointing angle in degrees |
代码:
var dataset = ee.ImageCollection('ASTER/AST_L1T_003') .filter(ee.Filter.date('2018-01-01', '2018-08-15')); var falseColor = dataset.select(['B3N', 'B02', 'B01']); var falseColorVis = { min: 0.0, max: 255.0, }; Map.setCenter(-122.0272, 39.6734, 11); Map.addLayer(falseColor.median(), falseColorVis, 'False Color');
这个影像是覆盖全球的!