MYD09A1.061 Aqua Surface Reflectance 8-Day Global 500m

Page Summary

The MYD09A1 V6.1 product provides estimates of surface spectral reflectance from Aqua MODIS bands 1-7 at 500m resolution, corrected for atmospheric effects.
The dataset is available from 2002-07-04 to 2025-09-30 and is updated every 8 days.
This dataset includes seven reflectance bands, a quality layer, and four observation bands, with pixels selected based on criteria like observation coverage, view angle, and lack of clouds or aerosols.
There are no restrictions on the use, sale, or redistribution of MODIS data and products acquired through the LP DAAC.
Detailed documentation for this product is available through a User's Guide, an Algorithm Theoretical Basis Document (ATBD), and General Documentation.

Dataset Availability: 2002-07-04T00:00:00Z–2026-03-30T00:00:00Z
Dataset Producer: NASA LP DAAC at the USGS EROS Center

Cadence: 8 Days
Tags: 8-day aqua global modis nasa satellite-imagery sr surface-reflectance usgs
myd09a1

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

Bands

Pixel size: 500 meters (all bands)

Name

Units

Min

Max

Scale

Pixel Size

Wavelength

Description

sur_refl_b01

-100

16000

0.0001

500 meters

620-670nm

Surface reflectance for band 1

sur_refl_b02

-100

16000

0.0001

500 meters

841-876nm

Surface reflectance for band 2

sur_refl_b03

-100

16000

0.0001

500 meters

459-479nm

Surface reflectance for band 3

sur_refl_b04

-100

16000

0.0001

500 meters

545-565nm

Surface reflectance for band 4

sur_refl_b05

-100

16000

0.0001

500 meters

1230-1250nm

Surface reflectance for band 5

sur_refl_b06

-100

16000

0.0001

500 meters

1628-1652nm

Surface reflectance for band 6

sur_refl_b07

-100

16000

0.0001

500 meters

2105-2155nm

Surface reflectance for band 7

QA

500 meters

None

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
- 0: No
- 1: Yes
Bit 31: Adjacency correction performed
- 0: No
- 1: Yes

SolarZenith

deg

18000

0.01

500 meters

None

MODIS Solar zenith angle

ViewZenith

deg

18000

0.01

500 meters

None

MODIS view zenith angle

RelativeAzimuth

deg

-18000

18000

0.01

500 meters

None

MODIS relative azimuth angle

StateQA

500 meters

None

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
- 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

366

500 meters

None

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.

Citations

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

DOIs

https://doi.org/10.5067/MODIS/MYD09A1.061

Explore with Earth Engine

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

MYD09A1.061 Aqua Surface Reflectance 8-Day Global 500m

MODIS/061/MYD09A1, 8-day,aqua,global,modis,nasa,satellite-imagery,sr,surface-reflectance,usgs

2002-07-04T00:00:00Z/2026-03-30T00:00:00Z

-90 -180 90 180

Google Earth Engine

https://developers.google.com/earth-engine/datasets

MYD09A1.061 Aqua Surface Reflectance 8-Day Global 500m Stay organized with collections Save and categorize content based on your preferences.

Page Summary

Description

Bands

Terms of Use

Citations

DOIs

Explore with Earth Engine

Code Editor (JavaScript)

MYD09A1.061 Aqua Surface Reflectance 8-Day Global 500m