Google Earth Engine ——LANDSAT 7 TOA系列数据 8天/32天和年际数据

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此星光明 2022-05-26 01:51:19 博主文章分类：GEE数据集专栏 ©著作权

文章标签 sql Landsat 影像数据集 TOA 文章分类 Java 后端开发

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Landsat 7 Collection 1 Tier 1 calibrated top-of-atmosphere (TOA) reflectance. Calibration coefficients are extracted from the image metadata. See Chander et al. (2009) for details on the TOA computation.

Landsat 7 Collection 1 Tier 1校准的大气层顶部（TOA）反射率。校准系数从图像元数据中提取。关于TOA计算的细节，见Chander等人（2009）。

Dataset Availability

1999-01-01T00:00:00 - 2021-08-26T00:00:00

Dataset Provider

USGS/Google

Collection Snippet

ee.ImageCollection("LANDSAT/LE07/C01/T1_TOA")

Bands Table

Name	Description	Resolution	Wavelength
B1	Blue	30 meters	0.45 - 0.52 µm
B2	Green	30 meters	0.52 - 0.60 µm
B3	Red	30 meters	0.63 - 0.69 µm
B4	Near infrared	30 meters	0.77 - 0.90 µm
B5	Shortwave infrared 1	30 meters	1.55 - 1.75 µm
B6_VCID_1	Low-gain Thermal Infrared 1. This band has expanded dynamic range and lower radiometric resolution (sensitivity), with less saturation at high Digital Number (DN) values. Resampled from 60m to 30m.	60 meters	10.40 - 12.50 µm
B6_VCID_2	High-gain Thermal Infrared 1. This band has higher radiometric resolution (sensitivity), although it has a more restricted dynamic range. Resampled from 60m to 30m.	60 meters	10.40 - 12.50 µm
B7	Shortwave infrared 2	30 meters	2.08 - 2.35 µm
B8	Panchromatic	15 meters	0.52 - 0.90 µm
BQA	Landsat Collection 1 QA Bitmask ([See Landsat QA page](https://www.usgs.gov/land-resources/nli/landsat/landsat-collection-1-level-1-quality-assessment-band))	30 meters
BQA Bitmask	Bit 0: Designated Fill 0: No 1: Yes Bit 1: Designated Pixel 0: No 1: Yes Bits 2-3: Radiometric Saturation 0: No bands contain saturation 1: 1-2 bands contain saturation 2: 3-4 bands contain saturation 3: 5 or more bands contain saturation Bit 4: Cloud 0: No 1: Yes Bits 5-6: Cloud Confidence 0: Not Determined / Condition does not exist. 1: Low, (0-33 percent confidence) 2: Medium, (34-66 percent confidence) 3: High, (67-100 percent confidence) Bits 7-8: Cloud Shadow Confidence 0: Not Determined / Condition does not exist. 1: Low, (0-33 percent confidence) 2: Medium, (34-66 percent confidence) 3: High, (67-100 percent confidence) Bits 9-10: Snow / Ice Confidence 0: Not Determined / Condition does not exist. 1: Low, (0-33 percent confidence) 2: Medium, (34-66 percent confidence) 3: High, (67-100 percent confidence)

影像属性：

Name	Type	Description
CLOUD_COVER	Double	Percentage cloud cover (0-100), -1 = not calculated.
CLOUD_COVER_LAND	Double	Percentage cloud cover over land (0-100), -1 = not calculated.
COLLECTION_CATEGORY	String	Tier of scene. (T1 or T2)
COLLECTION_NUMBER	Double	Number of collection.
CORRECTION_BIAS_BAND_1	String	Internal calibration bias method for band 1.
CORRECTION_BIAS_BAND_2	String	Internal calibration bias method for band 2.
CORRECTION_BIAS_BAND_3	String	Internal calibration bias method for band 3.
CORRECTION_BIAS_BAND_4	String	Internal calibration bias method for band 4.
CORRECTION_BIAS_BAND_5	String	Internal calibration bias method for band 5.
CORRECTION_BIAS_BAND_6_VCID_1	String	Internal calibration bias method for band 6_VICD_1.
CORRECTION_BIAS_BAND_6_VCID_2	String	Internal calibration bias method for band 6_VICD_2.
CORRECTION_BIAS_BAND_7	String	Internal calibration bias method for band 7.
CORRECTION_BIAS_BAND_8	String	Internal calibration bias method for band 8.
CORRECTION_GAIN_BAND_1	String	Internal calibration gain method for band 1.
CORRECTION_GAIN_BAND_2	String	Internal calibration gain method for band 2.
CORRECTION_GAIN_BAND_3	String	Internal calibration gain method for band 3.
CORRECTION_GAIN_BAND_4	String	Internal calibration gain method for band 4.
CORRECTION_GAIN_BAND_5	String	Internal calibration gain method for band 5.
CORRECTION_GAIN_BAND_6_VCID_1	String	Internal calibration gain method for band 6_VCID_1.
CORRECTION_GAIN_BAND_6_VCID_2	String	Internal calibration gain method for band 6_VCID_2.
CORRECTION_GAIN_BAND_7	String	Internal calibration gain method for band 7.
CORRECTION_GAIN_BAND_8	String	Internal calibration gain method for band 8.
CPF_NAME	String	Calibration parameter file name.
DATA_CATEGORY	String	Current data category assigned to the data. Possible values: ("NOMINAL", "VALIDATION", "EXCHANGE", "TEST", "ENGINEERING")
DATA_TYPE	String	Data type identifier. (L1T or L1G)
DATE_ACQUIRED	String	Image acquisition date. "YYYY-MM-DD"
DATUM	String	Datum used in image creation.
EARTH_SUN_DISTANCE	Double	Earth sun distance in astronomical units (AU).
ELEVATION_SOURCE	String	Elevation model source used for standard terrain corrected (L1T) products.
ELLIPSOID	String	Ellipsoid used in image creation.
EPHEMERIS_TYPE	String	Ephemeris data type used to perform geometric correction. (Definitive or Predictive)
FILE_DATE	Double	File date in milliseconds since epoch.
GAIN_BAND_1	String	Gain state for Band 1. (L = Low gain, H = High)
GAIN_BAND_2	String	Gain state for Band 2. (L = Low gain, H = High)
GAIN_BAND_3	String	Gain state for Band 3. (L = Low gain, H = High)
GAIN_BAND_4	String	Gain state for Band 4. (L = Low gain, H = High)
GAIN_BAND_5	String	Gain state for Band 5. (L = Low gain, H = High)
GAIN_BAND_6_VCID_1	String	Gain state for Band 6 VCID_1. (L = Low gain, H = High)
GAIN_BAND_6_VCID_2	String	Gain state for Band 6 VCID_2. (L = Low gain, H = High)
GAIN_BAND_7	String	Gain state for Band 7. (L = Low gain, H = High)
GAIN_BAND_8	String	Gain state for Band 8. (L = Low gain, H = High)
GAIN_CHANGE_BAND_1	String	Presence and direction of gain change for Band 1 (LL = no change, HH = no change, LH = low to high, HL = high to low, U = Unknown).
GAIN_CHANGE_BAND_2	String	Presence and direction of gain change for Band 2 (LL = no change, HH = no change, LH = low to high, HL = high to low, U = Unknown).
GAIN_CHANGE_BAND_3	String	Presence and direction of gain change for Band 3 (LL = no change, HH = no change, LH = low to high, HL = high to low, U = Unknown).
GAIN_CHANGE_BAND_4	String	Presence and direction of gain change for Band 4 (LL = no change, HH = no change, LH = low to high, HL = high to low, U = Unknown).
GAIN_CHANGE_BAND_5	String	Presence and direction of gain change for Band 5 (LL = no change, HH = no change, LH = low to high, HL = high to low, U = Unknown).
GAIN_CHANGE_BAND_6_VCID_1	String	Presence and direction of gain change for Band 6 VCID_1 (LL = no change, HH = no change, LH = low to high, HL = high to low, U = Unknown).
GAIN_CHANGE_BAND_6_VCID_2	String	Presence and direction of gain change for Band 6 VCID_2 (LL = no change, HH = no change, LH = low to high, HL = high to low, U = Unknown).
GAIN_CHANGE_BAND_7	String	Presence and direction of gain change for Band 7 (LL = no change, HH = no change, LH = low to high, HL = high to low, U = Unknown).
GAIN_CHANGE_BAND_8	String	Presence and direction of gain change for Band 8 (LL = no change, HH = no change, LH = low to high, HL = high to low, U = Unknown).
GAIN_CHANGE_SCAN_BAND_1	Double	Scan line number where the first change in Band 1 gain was detected.
GAIN_CHANGE_SCAN_BAND_2	Double	Scan line number where the first change in Band 2 gain was detected.
GAIN_CHANGE_SCAN_BAND_3	Double	Scan line number where the first change in Band 3 gain was detected.
GAIN_CHANGE_SCAN_BAND_4	Double	Scan line number where the first change in Band 4 gain was detected.
GAIN_CHANGE_SCAN_BAND_5	Double	Scan line number where the first change in Band 5 gain was detected.
GAIN_CHANGE_SCAN_BAND_6_VCID_1	Double	Scan line number where the first change in Band 6 VCID 1 gain was detected.
GAIN_CHANGE_SCAN_BAND_6_VCID_2	Double	Scan line number where the first change in Band 6 VCID 2 gain was detected.
GAIN_CHANGE_SCAN_BAND_7	Double	Scan line number where the first change in Band 7 gain was detected.
GAIN_CHANGE_SCAN_BAND_8	Double	Scan line number where the first change in Band 8 gain was detected.
GEOMETRIC_RMSE_MODEL	Double	Combined Root Mean Square Error (RMSE) of the geometric residuals (metres) in both across-track and along-track directions measured on the GCPs used in geometric precision correction. Not present in L1G products.
GEOMETRIC_RMSE_MODEL_X	Double	RMSE of the X direction geometric residuals (in metres) measured on the GCPs used in geometric precision correction. Not present in L1G products.
GEOMETRIC_RMSE_MODEL_Y	Double	RMSE of the Y direction geometric residuals (in metres) measured on the GCPs used in geometric precision correction. Not present in L1G products.
GRID_CELL_SIZE_PANCHROMATIC	Double	Grid cell size used in creating the image for the panchromatic band.
GRID_CELL_SIZE_REFLECTIVE	Double	Grid cell size used in creating the image for the reflective band.
GRID_CELL_SIZE_THERMAL	Double	Grid cell size used in creating the image for the thermal band.
GROUND_CONTROL_POINTS_MODEL	Double	The number of ground control points used. Not used in L1GT products. Values: 0 - 999 (0 is used for L1T products that have used Multi-scene refinement).
GROUND_CONTROL_POINTS_VERIFY	Double	The number of ground control points used in the verification of the terrain corrected product. Values: -1 to 1615 (-1 = not available)
GROUND_CONTROL_POINTS_VERSION	Double	The number of ground control points used in the verification of the terrain corrected product. Values: -1 to 1615 (-1 = not available)
IMAGE_QUALITY	Double	Image quality, 0 = worst, 9 = best, -1 = quality not calculated
K1_CONSTANT_BAND_6_VCID_1	Double	Calibration K1 constant for Band 6 VCID 1 radiance to temperature conversion.
K1_CONSTANT_BAND_6_VCID_2	Double	Calibration K1 constant for Band 6 VCID 2 radiance to temperature conversion.
K2_CONSTANT_BAND_6_VCID_1	Double	Calibration K2 constant for Band 6 VCID 1 radiance to temperature conversion.
K2_CONSTANT_BAND_6_VCID_2	Double	Calibration K2 constant for Band 6 VCID 2 radiance to temperature conversion.
LANDSAT_PRODUCT_ID	String	The naming convention of each Landsat Collection 1 Level-1 image based on acquisition parameters and processing parameters. Format: LXSS_LLLL_PPPRRR_YYYYMMDD_yyyymmdd_CC_TX * L = Landsat * X = Sensor (O = Operational Land Imager, T = Thermal Infrared Sensor, C = Combined OLI/TIRS) * SS = Satellite (08 = Landsat 8) * LLLL = Processing Correction Level (L1TP = precision and terrain, L1GT = systematic terrain, L1GS = systematic) * PPP = WRS Path * RRR = WRS Row * YYYYMMDD = Acquisition Date expressed in Year, Month, Day * yyyymmdd = Processing Date expressed in Year, Month, Day * CC = Collection Number (01) * TX = Collection Category (RT = Real Time, T1 = Tier 1, T2 = Tier 2)
LANDSAT_SCENE_ID	String	The Pre-Collection naming convention of each image is based on acquisition parameters. This was the naming convention used prior to Collection 1. Format: LXSPPPRRRYYYYDDDGSIVV * L = Landsat * X = Sensor (O = Operational Land Imager, T = Thermal Infrared Sensor, C = Combined OLI/TIRS) * S = Satellite (08 = Landsat 8) * PPP = WRS Path * RRR = WRS Row * YYYY = Year of Acquisition * DDD = Julian Day of Acquisition * GSI = Ground Station Identifier * VV = Version
MAP_PROJECTION	String	Projection used to represent the 3-dimensional surface of the earth for the Level-1 product.
MAP_PROJECTION_L0RA	String	L0RA map projection selectively applied to HDTs based on geographic location. Used for processed archive data.
ORIENTATION	String	Orientation used in creating the image. Values: NOMINAL = Nominal Path, NORTH_UP = North Up, TRUE_NORTH = True North, USER = User
PANCHROMATIC_LINES	Double	Number of product lines for the panchromatic band.
PANCHROMATIC_SAMPLES	Double	Number of product samples for the panchromatic bands.
PROCESSING_SOFTWARE_VERSION	String	Name and version of the processing software used to generate the L1 product.
RADIANCE_ADD_BAND_1	Double	Additive rescaling factor used to convert calibrated DN to radiance for Band 1.
RADIANCE_ADD_BAND_2	Double	Additive rescaling factor used to convert calibrated DN to radiance for Band 2.
RADIANCE_ADD_BAND_3	Double	Additive rescaling factor used to convert calibrated DN to radiance for Band 3.
RADIANCE_ADD_BAND_4	Double	Additive rescaling factor used to convert calibrated DN to radiance for Band 4.
RADIANCE_ADD_BAND_5	Double	Additive rescaling factor used to convert calibrated DN to radiance for Band 5.
RADIANCE_ADD_BAND_6_VCID_1	Double	Additive rescaling factor used to convert calibrated DN to radiance for Band 6 VCID 1.
RADIANCE_ADD_BAND_6_VCID_2	Double	Additive rescaling factor used to convert calibrated DN to radiance for Band 6 VCID 2.
RADIANCE_ADD_BAND_7	Double	Additive rescaling factor used to convert calibrated DN to radiance for Band 7.
RADIANCE_ADD_BAND_8	Double	Additive rescaling factor used to convert calibrated DN to radiance for Band 8.
RADIANCE_MAXIMUM_BAND_1	Double	Maximum achievable spectral radiance value for Band 1.
RADIANCE_MAXIMUM_BAND_2	Double	Maximum achievable spectral radiance value for Band 2.
RADIANCE_MAXIMUM_BAND_3	Double	Maximum achievable spectral radiance value for Band 3.
RADIANCE_MAXIMUM_BAND_4	Double	Maximum achievable spectral radiance value for Band 4.
RADIANCE_MAXIMUM_BAND_5	Double	Maximum achievable spectral radiance value for Band 5.
RADIANCE_MAXIMUM_BAND_6_VCID_1	Double	Maximum achievable spectral radiance value for Band 6 VCID 1.
RADIANCE_MAXIMUM_BAND_6_VCID_2	Double	Maximum achievable spectral radiance value for Band 6 VCID 2.
RADIANCE_MAXIMUM_BAND_7	Double	Maximum achievable spectral radiance value for Band 7.
RADIANCE_MAXIMUM_BAND_8	Double	Maximum achievable spectral radiance value for Band 8.
RADIANCE_MINIMUM_BAND_1	Double	Minimum achievable spectral radiance value for Band 1.
RADIANCE_MINIMUM_BAND_2	Double	Minimum achievable spectral radiance value for Band 2.
RADIANCE_MINIMUM_BAND_3	Double	Minimum achievable spectral radiance value for Band 3.
RADIANCE_MINIMUM_BAND_4	Double	Minimum achievable spectral radiance value for Band 4.
RADIANCE_MINIMUM_BAND_5	Double	Minimum achievable spectral radiance value for Band 5.
RADIANCE_MINIMUM_BAND_6_VCID_1	Double	Minimum achievable spectral radiance value for Band 6 VCID 1.
RADIANCE_MINIMUM_BAND_6_VCID_2	Double	Minimum achievable spectral radiance value for Band 6 VCID 2.
RADIANCE_MINIMUM_BAND_7	Double	Minimum achievable spectral radiance value for Band 7.
RADIANCE_MINIMUM_BAND_8	Double	Minimum achievable spectral radiance value for Band 8.
RADIANCE_MULT_BAND_1	Double	Multiplicative rescaling factor used to convert calibrated Band 1 DN to radiance.
RADIANCE_MULT_BAND_2	Double	Multiplicative rescaling factor used to convert calibrated Band 2 DN to radiance.
RADIANCE_MULT_BAND_3	Double	Multiplicative rescaling factor used to convert calibrated Band 3 DN to radiance.
RADIANCE_MULT_BAND_4	Double	Multiplicative rescaling factor used to convert calibrated Band 4 DN to radiance.
RADIANCE_MULT_BAND_5	Double	Multiplicative rescaling factor used to convert calibrated Band 5 DN to radiance.
RADIANCE_MULT_BAND_6_VCID_1	Double	Multiplicative rescaling factor used to convert calibrated Band 6 VCID 1 DN to radiance.
RADIANCE_MULT_BAND_6_VCID_2	Double	Multiplicative rescaling factor used to convert calibrated Band 6 VCID 2 DN to radiance.
RADIANCE_MULT_BAND_7	Double	Multiplicative rescaling factor used to convert calibrated Band 7 DN to radiance.
RADIANCE_MULT_BAND_8	Double	Multiplicative rescaling factor used to convert calibrated Band 8 DN to radiance.
REFLECTANCE_ADD_BAND_1	Double	Additive rescaling factor used to convert calibrated Band 1 DN to reflectance.
REFLECTANCE_ADD_BAND_2	Double	Additive rescaling factor used to convert calibrated Band 2 DN to reflectance.
REFLECTANCE_ADD_BAND_3	Double	Additive rescaling factor used to convert calibrated Band 3 DN to reflectance.
REFLECTANCE_ADD_BAND_4	Double	Additive rescaling factor used to convert calibrated Band 4 DN to reflectance.
REFLECTANCE_ADD_BAND_5	Double	Additive rescaling factor used to convert calibrated Band 5 DN to reflectance.
REFLECTANCE_ADD_BAND_7	Double	Additive rescaling factor used to convert calibrated Band 7 DN to reflectance.
REFLECTANCE_ADD_BAND_8	Double	Additive rescaling factor used to convert calibrated Band 8 DN to reflectance.
REFLECTANCE_MAXIMUM_BAND_1	Double	Maximum achievable spectral reflectance value for Band 1.
REFLECTANCE_MAXIMUM_BAND_2	Double	Maximum achievable spectral reflectance value for Band 2.
REFLECTANCE_MAXIMUM_BAND_3	Double	Maximum achievable spectral reflectance value for Band 3.
REFLECTANCE_MAXIMUM_BAND_4	Double	Maximum achievable spectral reflectance value for Band 4.
REFLECTANCE_MAXIMUM_BAND_5	Double	Maximum achievable spectral reflectance value for Band 5.
REFLECTANCE_MAXIMUM_BAND_7	Double	Maximum achievable spectral reflectance value for Band 7.
REFLECTANCE_MAXIMUM_BAND_8	Double	Maximum achievable spectral reflectance value for Band 8.
REFLECTANCE_MINIMUM_BAND_1	Double	Minimum achievable spectral reflectance value for Band 1.
REFLECTANCE_MINIMUM_BAND_2	Double	Minimum achievable spectral reflectance value for Band 2.
REFLECTANCE_MINIMUM_BAND_3	Double	Minimum achievable spectral reflectance value for Band 3.
REFLECTANCE_MINIMUM_BAND_4	Double	Minimum achievable spectral reflectance value for Band 4.
REFLECTANCE_MINIMUM_BAND_5	Double	Minimum achievable spectral reflectance value for Band 5.
REFLECTANCE_MINIMUM_BAND_7	Double	Minimum achievable spectral reflectance value for Band 7.
REFLECTANCE_MINIMUM_BAND_8	Double	Minimum achievable spectral reflectance value for Band 8.
REFLECTANCE_MULT_BAND_1	Double	Multiplicative factor used to convert calibrated Band 1 DN to reflectance.
REFLECTANCE_MULT_BAND_2	Double	Multiplicative factor used to convert calibrated Band 2 DN to reflectance.
REFLECTANCE_MULT_BAND_3	Double	Multiplicative factor used to convert calibrated Band 3 DN to reflectance.
REFLECTANCE_MULT_BAND_4	Double	Multiplicative factor used to convert calibrated Band 4 DN to reflectance.
REFLECTANCE_MULT_BAND_5	Double	Multiplicative factor used to convert calibrated Band 5 DN to reflectance.
REFLECTANCE_MULT_BAND_7	Double	Multiplicative factor used to convert calibrated Band 7 DN to reflectance.
REFLECTANCE_MULT_BAND_8	Double	Multiplicative factor used to convert calibrated Band 8 DN to reflectance.
REFLECTIVE_LINES	Double	Number of product lines for the reflective bands.
REFLECTIVE_SAMPLES	Double	Number of product samples for the reflective bands.
REQUEST_ID	String	Request id, nnnyymmdd0000_0000 * nnn = node number * yy = year * mm = month * dd = day
RESAMPLING_OPTION	String	Resampling option used in creating the image.
SATURATION_BAND_1	String	Flag indicating saturated pixels for band 1 ('Y'/'N')
SATURATION_BAND_2	String	Flag indicating saturated pixels for band 2 ('Y'/'N')
SATURATION_BAND_3	String	Flag indicating saturated pixels for band 3 ('Y'/'N')
SATURATION_BAND_4	String	Flag indicating saturated pixels for band 4 ('Y'/'N')
SATURATION_BAND_5	String	Flag indicating saturated pixels for band 5 ('Y'/'N')
SATURATION_BAND_6_VCID_1	String	Flag indicating saturated pixels for band 6 VCID 1 ('Y'/'N')
SATURATION_BAND_6_VCID_2	String	Flag indicating saturated pixels for band 6 VCID 2 ('Y'/'N')
SATURATION_BAND_7	String	Flag indicating saturated pixels for band 7 ('Y'/'N')
SATURATION_BAND_8	String	Flag indicating saturated pixels for band 8 ('Y'/'N')
SCENE_CENTER_TIME	String	Scene center time of acquired image. HH:MM:SS.SSSSSSSZ * HH = Hour (00-23) * MM = Minutes * SS.SSSSSSS = Fractional seconds * Z = "Zulu" time (same as GMT)
SENSOR_ID	String	Sensor used to capture data.
SENSOR_MODE	String	Operational mode. Scan Angle Monitor (SAM) or BUMPER.
SPACECRAFT_ID	String	Spacecraft identification.
STATION_ID	String	Ground Station/Organisation that received the data.
SUN_AZIMUTH	Double	Sun azimuth angle in degrees for the image center location at the image centre acquisition time.
SUN_ELEVATION	Double	Sun elevation angle in degrees for the image center location at the image centre acquisition time.
THERMAL_LINES	Double	Number of product lines for the thermal band.
THERMAL_SAMPLES	Double	Number of product samples for the thermal band.
UTM_ZONE	Double	UTM zone number used in product map projection.
WRS_PATH	Double	The WRS orbital path number (001 - 251).
WRS_ROW	Double	Landsat satellite WRS row (001-248).

使用说明：

Landsat datasets are federally created data and therefore reside in the public domain and may be used, transferred, or reproduced without copyright restriction.

Acknowledgement or credit of the USGS as data source should be provided by including a line of text citation such as the example shown below.

(Product, Image, Photograph, or Dataset Name) courtesy of the U.S. Geological Survey

Example: Landsat-7 image courtesy of the U.S. Geological Survey

See the USGS Visual Identity System Guidance for further details on proper citation and acknowledgement of USGS products.

Landsat数据集是联邦创建的数据，因此属于公共领域，可以在没有版权限制的情况下使用、转让或复制。

对美国地质调查局作为数据来源的确认或信用，应通过包括一行文字引用来提供，如下面的例子。

(产品、图像、照片或数据集名称）由美国地质调查局提供。

例子。Landsat-7图像由美国地质调查局提供

请参阅美国地质调查局视觉识别系统指南，了解有关美国地质调查局产品的正确引用和鸣谢的进一步细节。

代码：

var dataset = ee.ImageCollection('LANDSAT/LE07/C01/T1_32DAY_TOA')
                  .filterDate('1999-01-01', '2002-12-31');
var trueColor = dataset.select(['B3', 'B2', 'B1']);
var trueColorVis = {
  min: 0,
  max: 0.4,
  gamma: 1.2,
};
Map.setCenter(-3.7408, 40.4386, 8);
Map.addLayer(trueColor, trueColorVis, 'True Color (321)');

代码：

var dataset = ee.ImageCollection('LANDSAT/LE07/C01/T1_8DAY_TOA')
                  .filterDate('1999-01-01', '2002-12-31');
var trueColor = dataset.select(['B3', 'B2', 'B1']);
var trueColorVis = {
  min: 0,
  max: 0.4,
  gamma: 1.2,
};
Map.setCenter(-3.7408, 40.4386, 8);
Map.addLayer(trueColor, trueColorVis, 'True Color (321)');

代码：

var dataset = ee.ImageCollection('LANDSAT/LE07/C01/T1_ANNUAL_TOA')
                  .filterDate('1999-01-01', '2006-12-31');
var trueColor = dataset.select(['B3', 'B2', 'B1']);
var trueColorVis = {
  min: 0,
  max: 0.4,
  gamma: 1.2,
};
Map.setCenter(-3.7408, 40.4386, 8);
Map.addLayer(trueColor, trueColorVis, 'True Color (321)');