Google Earth Engine ——MYD09GA.006 Aqua 地表反射率 Daily Global 1km and 500m在没有大气散射或吸收的情况下在地

The MODIS Surface Reflectance products provide an estimate of the surface spectral reflectance as it would be measured at ground level in the absence of atmospheric scattering or absorption. Low-level data are corrected for atmospheric gases and aerosols. MYD09GA version 6 provides bands 1-7 in a daily gridded L2G product in the sinusoidal projection, including 500m reflectance values and 1km observation and geolocation statistics.

Documentation:

• User's Guide
• Algorithm Theoretical Basis Document (ATBD)
• General Documentation

MODIS表面反射率产品提供了在没有大气散射或吸收的情况下在地面测量的表面光谱反射率的估计。低层数据经过了大气气体和气溶胶的校正。MYD09GA第6版在正弦投影的每日网格化L2G产品中提供了波段1-7，包括500米反射值和1公里观测和地理位置统计。

Dataset Availability

2002-07-04T00:00:00 - 2021-09-20T00:00:00

Bands Table

• 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

SensorZenithSensor zenith angle0180001000 metersDegrees0.01SensorAzimuthSensor azimuth angle-18000180001000 metersDegrees0.01RangeDistance to sensor27000655351000 metersMeters25SolarZenithSolar zenith angle0180001000 metersDegrees0.01SolarAzimuthSolar azimuth angle-18000180001000 metersDegrees0.01gflagsGeolocation flags1000 meters0gflags Bitmask

• Bits 0-2: Fill
  • 0: Fill
• Bit 3: Sensor range validity flag
  • 0: Valid
  • 1: Invalid
• Bit 4: Digital elevation model quality flag
  • 0: Valid
  • 1: Missing/inferior
• Bit 5: Terrain data validity
  • 0: Valid
  • 1: Invalid
• Bit 6: Ellipsoid intersection flag
  • 0: Valid intersection
  • 1: No intersection
• Bit 7: Input data flag
  • 0: Valid
  • 1: Invalid

orbit_pntOrbit pointer0151000 meters0granule_pntGranule pointer02541000 meters0num_observations_500mNumber of observations0127500 meters0sur_refl_b01Surface reflectance for band 1-10016000500 meters620-670nm0.0001sur_refl_b02Surface reflectance for band 2-10016000500 meters841-876nm0.0001sur_refl_b03Surface reflectance for band 3-10016000500 meters459-479nm0.0001sur_refl_b04Surface reflectance for band 4-10016000500 meters545-565nm0.0001sur_refl_b05Surface reflectance for band 5-10016000500 meters1230-1250nm0.0001sur_refl_b06Surface reflectance for band 6-10016000500 meters1628-1652nm0.0001sur_refl_b07Surface reflectance for band 7-10016000500 meters2105-2155nm0.0001QC_500mSurface reflectance quality assurance500 meters0QC_500m 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

obscov_500mObservation coverage percent0100500 meters0iobs_resObservation number in coarser grid0254500 meters0q_scan250m scan value information500 meters0q_scan Bitmask

• Bit 0: Scan of observation in quadrant 1 [-0.5 row, -0.5 column]
  • 0: No
  • 1: Yes
• Bit 1: Scan of observation in quadrant 2 [-0.5 row, +0.5 column]
  • 0: No
  • 1: Yes
• Bit 2: Scan of observation in quadrant 3 [+0.5 row, -0.5 column]
  • 0: No
  • 1: Yes
• Bit 3: Scan of observation in quadrant 4 [+0.5 row, +0.5 column]
  • 0: No
  • 1: Yes
• Bit 4: Missing observation in quadrant 1 [-0.5 row, -0.5 column]
  • 0: Different
  • 1: Same
• Bit 5: Missing observation in quadrant 2 [-0.5 row, +0.5 column]
  • 0: Different
  • 1: Same
• Bit 6: Missing observation in quadrant 3 [+0.5 row, -0.5 column]
  • 0: Different
  • 1: Same
• Bit 7: Missing observation in quadrant 4 [+0.5 row, +0.5 column]
  • 0: Different
  • 1: Same

Dataset Provider

NASA LP DAAC at the USGS EROS Center

Collection Snippet

ee.ImageCollection("MODIS/006/MYD09GA")

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 - MYD09GA

代码：

var dataset = ee.ImageCollection('MODIS/006/MYD09GA')
                  .filter(ee.Filter.date('2018-04-01', '2018-06-01'));
var trueColor143 =
    dataset.select(['sur_refl_b01', 'sur_refl_b04', 'sur_refl_b03']);
var trueColor143Vis = {
  min: -100.0,
  max: 8000.0,
};
Map.setCenter(-7.03125, 31.0529339857, 2);
Map.addLayer(trueColor143, trueColor143Vis, 'True Color (143)');