MYD09GQ.006 Aqua Surface Reflectance Daily Global 250m [deprecated]

AI-generated Key Takeaways

• This MODIS dataset (MYD09GQ version 6) provides daily surface reflectance data at 250m resolution, primarily focusing on bands 1 and 2.

• The dataset has been deprecated and superseded by a newer version, MODIS/061/MYD09GQ, which is recommended for use instead.

• Atmospheric corrections for gases and aerosols are applied to provide an estimate of surface reflectance as measured at ground level.

• The dataset covers the globe and includes quality control and observation layers for data analysis.

• Users can access the data and documentation through NASA's LP DAAC and explore it using Google Earth Engine.

Caution: This dataset has been superseded by MODIS/061/MYD09GQ.

Dataset Availability

2002-07-04T00:00:00Z–2023-02-25T00:00:00Z

Dataset Provider

NASA LP DAAC at the USGS EROS Center

Earth Engine Snippet

ee.ImageCollection("MODIS/006/MYD09GQ")

Cadence

1 Day

Tags

aqua

daily

global

modis

myd09gq

nasa

satellite-imagery

sr

surface-reflectance

usgs

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. MYD09GQ version 6 provides bands 1 and 2 at a 250m resolution in a daily gridded L2G product in the Sinusoidal projection, including a QC and five observation layers. This product is meant to be used in conjunction with the MYD09GA where important quality and viewing geometry information is stored.

Documentation:

• User's Guide

• Algorithm Theoretical Basis Document (ATBD)

• General Documentation

Bands

Pixel Size
250 meters

Bands

Name	Min	Max	Scale	Pixel Size	Wavelength	Description
num_observations	0	127		meters	None	Number of observations per 250m pixel
sur_refl_b01	-100	16000	0.0001	meters	620-670nm	Surface reflectance band 1
sur_refl_b02	-100	16000	0.0001	meters	841-876nm	Surface reflectance for band 2
QC_250m				meters	None	Surface reflectance quality assurance
Bitmask for QC_250m 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 2-3: Spare (unused) 0: N/A Bits 4-7: Band 1 data quality 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 8-11: Band 2 data quality 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 12: Atmospheric correction performed 0: No 1: Yes Bit 13: Adjacency correction performed 0: No 1: Yes Bits 14-15: Spare (unused) 0: N/A
obscov	0	100	0.01	meters	None	Observation coverage percent
iobs_res	0	254		meters	None	Observation number
orbit_pnt	0	15		meters	None	Orbit pointer
granule_pnt	0	254		meters	None	Granule pointer

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/MYD09GQ.006

Explore with Earth Engine

Important: Earth Engine is a platform for petabyte-scale scientific analysis and visualization of geospatial datasets, both for public benefit and for business and government users. Earth Engine is free to use for research, education, and nonprofit use. To get started, please register for Earth Engine access.

Code Editor (JavaScript)

var dataset = ee.ImageCollection('MODIS/006/MYD09GQ')
                  .filter(ee.Filter.date('2018-01-01', '2018-05-01'));
var falseColorVis = {
  min: -100.0,
  max: 8000.0,
  bands: ['sur_refl_b02', 'sur_refl_b02', 'sur_refl_b01'],
};
Map.setCenter(6.746, 46.529, 2);
Map.addLayer(dataset, falseColorVis, 'False Color');

Open in Code Editor

MYD09GQ.006 Aqua Surface Reflectance Daily Global 250m [deprecated]

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. MYD09GQ version 6 provides bands 1 and 2 at a 250m resolution …

MODIS/006/MYD09GQ, aqua,daily,global,modis,nasa,satellite-imagery,sr,surface-reflectance,usgs

2002-07-04T00:00:00Z/2023-02-25T00:00:00Z

-90 -180 90 180

Google Earth Engine

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

• https://doi.org/10.5067/MODIS/MYD09GQ.006
• https://doi.org/10.5067/MODIS/MYD09GQ.006