Google Earth Engine ——数据全解析专辑（ASTER L1T Radiance）

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发布于 2024-02-02 08:49:44

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发布于 2024-02-02 08:49:44

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');