Google Earth Engine ——MYD09A1.006 Aqua Surface Reflectance 8-DayAqua MODIS 1-7带500米分辨率

简介: Google Earth Engine ——MYD09A1.006 Aqua Surface Reflectance 8-DayAqua MODIS 1-7带500米分辨率

The MYD09A1 V6 product provides an estimate of the surface spectral reflectance of Aqua MODIS bands 1-7 at 500m resolution and corrected for atmospheric conditions such as gasses, aerosols, and Rayleigh scattering. Along with the seven reflectance bands is a quality layer and four observation bands. For each pixel, a value is selected from all the acquisitions within the 8-day composite on the basis of high observation coverage, low view angle, the absence of clouds or cloud shadow, and aerosol loading.

Documentation:


MYD09A1 V6产品提供了Aqua MODIS 1-7带500米分辨率的表面光谱反射率的估计,并对大气条件如气体、气溶胶和瑞利散射进行了校正。与七个反射带一起的是一个质量层和四个观测带。对于每个像素,根据高观测覆盖率、低视角、无云或云影以及气溶胶负荷,从8天合成的所有采集中选择一个值。

Resolution

500 meters

Bands Table

Name Description Min Max Units Wavelength Scale
sur_refl_b01 Surface reflectance for band 1 -100 16000 620-670nm 0.0001
sur_refl_b02 Surface reflectance for band 2 -100 16000 841-876nm 0.0001
sur_refl_b03 Surface reflectance for band 3 -100 16000 459-479nm 0.0001
sur_refl_b04 Surface reflectance for band 4 -100 16000 545-565nm 0.0001
sur_refl_b05 Surface reflectance for band 5 -100 16000 1230-1250nm 0.0001
sur_refl_b06 Surface reflectance for band 6 -100 16000 1628-1652nm 0.0001
sur_refl_b07 Surface reflectance for band 7 -100 16000 2105-2155nm 0.0001
QA Surface reflectance 500m band quality control flags 0
QA Bitmask
  • Bits 0-1: MODLAND QA bits
    • 0: Corrected product produced at ideal quality - all bands
    • 1: Corrected product produced at less than ideal quality - some or all bands
    • 2: Corrected product not produced due to cloud effects - all bands
    • 3: Corrected product not produced for other reasons - some or all bands, may be fill value (11) [Note that a value of (11) overrides a value of (01)]
  • Bits 2-5: Band 1 data quality, four bit range
    • 0: Highest quality
    • 7: Noisy detector
    • 8: Dead detector, data interpolated in L1B
    • 9: Solar zenith ≥ 86 degrees
    • 10: Solar zenith ≥ 85 and < 86 degrees
    • 11: Missing input
    • 12: Internal constant used in place of climatological data for at least one atmospheric constant
    • 13: Correction out of bounds, pixel constrained to extreme allowable value
    • 14: L1B data faulty
    • 15: Not processed due to deep ocean or clouds
  • Bits 6-9: Band 2 data quality, four bit range
    • 0: Highest quality
    • 7: Noisy detector
    • 8: Dead detector, data interpolated in L1B
    • 9: Solar zenith ≥ 86 degrees
    • 10: Solar zenith ≥ 85 and < 86 degrees
    • 11: Missing input
    • 12: Internal constant used in place of climatological data for at least one atmospheric constant
    • 13: Correction out of bounds, pixel constrained to extreme allowable value
    • 14: L1B data faulty
    • 15: Not processed due to deep ocean or clouds
  • Bits 10-13: Band 3 data quality, four bit range
    • 0: Highest quality
    • 7: Noisy detector
    • 8: Dead detector, data interpolated in L1B
    • 9: Solar zenith ≥ 86 degrees
    • 10: Solar zenith ≥ 85 and < 86 degrees
    • 11: Missing input
    • 12: Internal constant used in place of climatological data for at least one atmospheric constant
    • 13: Correction out of bounds, pixel constrained to extreme allowable value
    • 14: L1B data faulty
    • 15: Not processed due to deep ocean or clouds
  • Bits 14-17: Band 4 data quality, four bit range
    • 0: Highest quality
    • 7: Noisy detector
    • 8: Dead detector, data interpolated in L1B
    • 9: Solar zenith ≥ 86 degrees
    • 10: Solar zenith ≥ 85 and < 86 degrees
    • 11: Missing input
    • 12: Internal constant used in place of climatological data for at least one atmospheric constant
    • 13: Correction out of bounds, pixel constrained to extreme allowable value
    • 14: L1B data faulty
    • 15: Not processed due to deep ocean or clouds
  • Bits 18-21: Band 5 data quality, four bit range
    • 0: Highest quality
    • 7: Noisy detector
    • 8: Dead detector, data interpolated in L1B
    • 9: Solar zenith ≥ 86 degrees
    • 10: Solar zenith ≥ 85 and < 86 degrees
    • 11: Missing input
    • 12: Internal constant used in place of climatological data for at least one atmospheric constant
    • 13: Correction out of bounds, pixel constrained to extreme allowable value
    • 14: L1B data faulty
    • 15: Not processed due to deep ocean or clouds
  • Bits 22-25: Band 6 data quality, four bit range
    • 0: Highest quality
    • 7: Noisy detector
    • 8: Dead detector, data interpolated in L1B
    • 9: Solar zenith ≥ 86 degrees
    • 10: Solar zenith ≥ 85 and < 86 degrees
    • 11: Missing input
    • 12: Internal constant used in place of climatological data for at least one atmospheric constant
    • 13: Correction out of bounds, pixel constrained to extreme allowable value
    • 14: L1B data faulty
    • 15: Not processed due to deep ocean or clouds
  • Bits 26-29: Band 7 data quality, four bit range
    • 0: Highest quality
    • 7: Noisy detector
    • 8: Dead detector, data interpolated in L1B
    • 9: Solar zenith ≥ 86 degrees
    • 10: Solar zenith ≥ 85 and < 86 degrees
    • 11: Missing input
    • 12: Internal constant used in place of climatological data for at least one atmospheric constant
    • 13: Correction out of bounds, pixel constrained to extreme allowable value
    • 14: L1B data faulty
    • 15: Not processed due to deep ocean or clouds
  • Bit 30: Atmospheric correction performed
    • 0: No
    • 1: Yes
  • Bit 31: Adjacency correction performed
    • 0: No
    • 1: Yes
SolarZenith MODIS Solar zenith angle 0 18000 Degrees 0.01
ViewZenith MODIS view zenith angle 0 18000 Degrees 0.01
RelativeAzimuth MODIS relative azimuth angle -18000 18000 Degrees 0.01
StateQA Surface reflectance 500m state flags 0
StateQA Bitmask
  • Bits 0-1: Cloud state
    • 0: Clear
    • 1: Cloudy
    • 2: Mixed
    • 3: Not set, assumed clear
  • Bit 2: Cloud shadow
    • 0: No
    • 1: Yes
  • Bits 3-5: Land/water flag
    • 0: Shallow ocean
    • 1: Land
    • 2: Ocean coastlines and lake shorelines
    • 3: Shallow inland water
    • 4: Ephemeral water
    • 5: Deep inland water
    • 6: Continental/moderate ocean
    • 7: Deep ocean
  • Bits 6-7: Aerosol quantity
    • 0: Climatology
    • 1: Low
    • 2: Average
    • 3: High
  • Bits 8-9: Cirrus detected
    • 0: None
    • 1: Small
    • 2: Average
    • 3: High
  • Bit 10: Internal cloud algorithm flag
    • 0: No cloud
    • 1: Cloud
  • Bit 11: Internal fire algorithm flag
    • 0: No fire
    • 1: Fire
  • Bit 12: MOD35 snow/ice flag
    • 0: No
    • 1: Yes
  • Bit 13: Pixel is adjacent to cloud
    • 0: No
    • 1: Yes
  • Bit 14: BRDF correction performed data
    • 0: No
    • 1: Yes
  • Bit 15: Internal snow mask
    • 0: No snow
    • 1: Snow
DayOfYear Julian day of the year for the pixel 1 366

使用说明:

Please visit LP DAAC 'Citing Our Data' page for information on citing LP DAAC datasets.

数据引用:

LP DAAC - MYD09A1

代码:

var dataset = ee.ImageCollection('MODIS/006/MYD09A1')
                  .filter(ee.Filter.date('2018-01-01', '2018-05-01'));
var trueColor =
    dataset.select(['sur_refl_b01', 'sur_refl_b04', 'sur_refl_b03']);
var trueColorVis = {
  min: -100.0,
  max: 3000.0,
};
Map.setCenter(6.746, 46.529, 2);
Map.addLayer(trueColor, trueColorVis, 'True Color');


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