MYD09GA.061 Aqua Surface Reflectance Daily Global 1km and 500m

AI-generated Key Takeaways

The MODIS Surface Reflectance products provide an estimate of surface spectral reflectance corrected for atmospheric effects.
The MYD09GA version 6.1 dataset provides daily gridded L2G products in the sinusoidal projection with 500m reflectance values and 1km observation/geolocation statistics.
This dataset includes various bands for surface reflectance (bands 1-7) as well as bands providing observation, state, angle, range, and quality information.
The dataset is available from 2002-07-04 to 2025-10-14 with a daily cadence.
MODIS data and products from LP DAAC have no restrictions on subsequent use, sale, or redistribution.

Dataset Availability: 2002-07-04T00:00:00Z–2025-10-24T00:00:00Z
Dataset Provider: NASA LP DAAC at the USGS EROS Center

Cadence: 1 Day
Tags: aqua daily global modis nasa satellite-imagery sr surface-reflectance usgs
myd09ga

Description

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 6.1 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:

Bands

Bands

Name	Units	Min	Max	Scale	Pixel Size	Wavelength	Description
`num_observations_1km`		2	127		1000 meters	None	Number of observations per 1K pixel
`state_1km`					1000 meters	None	Reflectance data state QA
Bitmask for state_1km 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
`SensorZenith`	deg	0	18000	0.01	1000 meters	None	Sensor zenith angle
`SensorAzimuth`	deg	-18000	18000	0.01	1000 meters	None	Sensor azimuth angle
`Range`	m	27000	65535	25	1000 meters	None	Distance to sensor
`SolarZenith`	deg	0	18000	0.01	1000 meters	None	Solar zenith angle
`SolarAzimuth`	deg	-18000	18000	0.01	1000 meters	None	Solar azimuth angle
`gflags`					1000 meters	None	Geolocation flags
Bitmask for gflags 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_pnt`		0	15		1000 meters	None	Orbit pointer
`granule_pnt`		0	254		1000 meters	None	Granule pointer
`num_observations_500m`		0	127		500 meters	None	Number of observations
`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
`QC_500m`					500 meters	None	Surface reflectance quality assurance
Bitmask for QC_500m 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_500m`		0	100		500 meters	None	Observation coverage percent
`iobs_res`		0	254		500 meters	None	Observation number in coarser grid
`q_scan`					500 meters	None	250m scan value information
Bitmask for q_scan 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

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/MYD09GA.061

Explore with Earth Engine

Code Editor (JavaScript)

var dataset = ee.ImageCollection('MODIS/061/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)');

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MYD09GA.061 Aqua Surface Reflectance Daily Global 1km and 500m

MODIS/061/MYD09GA, aqua,daily,global,modis,nasa,satellite-imagery,sr,surface-reflectance,usgs

2002-07-04T00:00:00Z/2025-10-24T00:00:00Z

-90 -180 90 180

Google Earth Engine

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

MYD09GA.061 Aqua Surface Reflectance Daily Global 1km and 500m Stay organized with collections Save and categorize content based on your preferences.

AI-generated Key Takeaways

Description

Bands

Terms of Use

Citations

DOIs

Explore with Earth Engine

Code Editor (JavaScript)

MYD09GA.061 Aqua Surface Reflectance Daily Global 1km and 500m