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

Dataset Availability

2002-07-04T00:00:00Z–2023-09-12T00:00:00

Dataset Provider

NASA LP DAAC at the USGS EROS Center

Earth Engine Snippet

ee.ImageCollection("MODIS/061/MYD09GA")

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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:

• User's Guide

• Algorithm Theoretical Basis Document (ATBD)

• General 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

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

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

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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

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 …

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

2002-07-04T00:00:00Z/2023-09-12T00:00:00

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