MYD09A1.061 Aqua Surface Reflectance 8-Day Global 500m
Description
The MYD09A1 V6.1 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:
Bands
Resolution
Bands
Name
Units
Min
Max
Scale
Wavelength
Description
sur_refl_b01
-100
16000
0.0001
620-670nm
Surface reflectance for band 1
sur_refl_b02
-100
16000
0.0001
841-876nm
Surface reflectance for band 2
sur_refl_b03
-100
16000
0.0001
459-479nm
Surface reflectance for band 3
sur_refl_b04
-100
16000
0.0001
545-565nm
Surface reflectance for band 4
sur_refl_b05
-100
16000
0.0001
1230-1250nm
Surface reflectance for band 5
sur_refl_b06
-100
16000
0.0001
1628-1652nm
Surface reflectance for band 6
sur_refl_b07
-100
16000
0.0001
2105-2155nm
Surface reflectance for band 7
QA
Surface reflectance 500m band quality control flags
Bitmask for QA
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
Bit 31: Adjacency correction performed
SolarZenithdeg
0
18000
0.01
MODIS Solar zenith angle
ViewZenithdeg
0
18000
0.01
MODIS view zenith angle
RelativeAzimuthdeg
-18000
18000
0.01
MODIS relative azimuth angle
StateQA
Surface reflectance 500m state flags
Bitmask for StateQA
Bits 0-1: Cloud state
0: Clear
1: Cloudy
2: Mixed
3: Not set, assumed clear
Bit 2: Cloud shadow
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
Bit 11: Internal fire algorithm flag
Bit 12: MOD35 snow/ice flag
Bit 13: Pixel is adjacent to cloud
Bit 14: BRDF correction performed data
Bit 15: Internal snow mask
DayOfYear
1
366
Julian day of the year for the pixel
Terms of Use
Terms of Use
MODIS data and products acquired through the LP DAAC
have no restrictions on subsequent use, sale, or redistribution.
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Code Editor (JavaScript)
var dataset = ee . ImageCollection ( 'MODIS/061/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' );
Open in Code Editor
[null,null,[],[[["MYD09A1 V6.1 provides an estimate of surface spectral reflectance for Aqua MODIS bands 1-7 at 500m resolution, corrected for atmospheric conditions."],["The product includes seven reflectance bands, a quality layer, and four observation bands, with pixel values selected from an 8-day composite for optimal quality."],["Data is available from July 4, 2002, to November 24, 2024, and is provided by NASA LP DAAC at the USGS EROS Center."],["The dataset is freely available for use, sale, and redistribution without restrictions."],["Users can explore and analyze the dataset using Google Earth Engine."]]],[]]
