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

Dataset Availability: 2002-07-04T00:00:00Z–2024-10-29T00:00:00Z
Dataset Provider: NASA LP DAAC at the USGS EROS Center
Earth Engine Snippet: ee.ImageCollection("MODIS/061/MYD09GA")
Tags: aqua daily global modis nasa 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		Number of observations per 1K pixel
`state_1km`					1000 meters		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		Sensor zenith angle
`SensorAzimuth`	deg	-18000	18000	0.01	1000 meters		Sensor azimuth angle
`Range`	m	27000	65535	25	1000 meters		Distance to sensor
`SolarZenith`	deg	0	18000	0.01	1000 meters		Solar zenith angle
`SolarAzimuth`	deg	-18000	18000	0.01	1000 meters		Solar azimuth angle
`gflags`					1000 meters		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		Orbit pointer
`granule_pnt`		0	254		1000 meters		Granule pointer
`num_observations_500m`		0	127		500 meters		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		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		Observation coverage percent
`iobs_res`		0	254		500 meters		Observation number in coarser grid
`q_scan`					500 meters		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

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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,sr,surface-reflectance,usgs

2002-07-04T00:00:00Z/2024-10-29T00:00:00Z

Google Earth Engine

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

https://doi.org/10.5067/MODIS/MYD09GA.061